{"title":"Performance Mfg Wheel Hubs","description":"\u003cp\u003eWheel hubs from Performance Mfg (PMI) for front and rear kart axles. Options include USA-pattern and metric front hubs, ultralight stepped fronts, and ultralight double-lock rear hubs.\u003c\/p\u003e","products":[{"product_id":"ultrafree-left-front-wheel-hub-with-1-4-hardware-pm-39f-1-4","title":"UltraFree Left Front Hub Equipped with 1\/4 Inch Hardware for Karts","description":"\u003cp\u003eTransform the way your kart attacks left-handers using the UltraFree left front wheel hub, paired with reliable 1\/4-inch hardware. This component's slim profile enhances aerodynamics while maintaining structural integrity for high-stakes racing.\u003c\/p\u003e\u003cp\u003eKey to its appeal is the reduced weight, which translates to snappier responses and better energy transfer to the track surface. Racers find it invaluable for fine-tuning front-end geometry, leading to optimized grip and speed.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEffortless Steering: Lowers effort needed for precise inputs during intense maneuvers.\u003c\/li\u003e\n\u003cli\u003eCompatible Integration: Works seamlessly with UltraFree systems for balanced setups.\u003c\/li\u003e\n\u003cli\u003eEndurance Focus: Resists fatigue from repeated impacts, ensuring race-long reliability.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eOrganize your spares with this hub's compact design—easy to store and swap, minimizing downtime. Envision powering out of turns with renewed vigor; this hub delivers that advantage by stabilizing the wheel under acceleration.\u003c\/p\u003e\u003cp\u003ePerformance Mfg prioritizes quality in every detail, from machining to finish, so you can focus on driving. For left-side dominance, it's a must-have that elevates overall chassis harmony. SKU: PM-39F-1\/4 – lightweight performance redefined.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why should I choose the UltraFree left front hub over a standard hub?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The UltraFree hub is engineered with a slim, lightweight profile that reduces unsprung weight. This allows for snappier steering response and improved energy transfer, specifically helping the kart rotate more effectively through left-hand turns.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this hub come with the necessary hardware?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, this hub is equipped with high-quality 1\/4-inch hardware, ensuring you have the correct studs for immediate installation and secure wheel mounting.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this hub compatible with all kart chassis?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This hub is designed for seamless integration with UltraFree systems. While it offers universal benefits for front-end geometry, we recommend verifying your spindle size and current hub configuration to ensure a perfect fit for your specific chassis.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does the weight reduction affect my kart's handling?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e By reducing weight at the wheel, you decrease the rotational mass and unsprung weight. This results in more precise steering inputs and helps the front end track more accurately over bumps and through high-speed corners.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What maintenance is required for this wheel hub?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e To ensure race-long reliability, periodically inspect the hub for signs of fatigue after heavy impacts. Keep the hardware clean and ensure the studs are torqued to manufacturer specifications before every session.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultrafree-left-front-stepped-wheel-hub-with-1-4-hardware-pm-39stfl-1-4\"\u003ePerformance Mfg UltraFree Left Front Stepped Hub - 1\/4\" Hardware - Oval Racing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultrafree-right-front-stepped-wheel-hub-with-1-4-hardware-pm-39stf-1-4\"\u003ePerformance Mfg UltraFree Right Front Stepped Hub - 1\/4\" Hardware - Racing Spec\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralight-right-front-stepped-hub-1-4-hardware-only-pm-39st-1-4\"\u003eUltralight Right Front Stepped Hub with 1\/4\" Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralite-5-8-front-hub-1-4-hardware-only-bullet-tip-studs-pm-39-1-4\"\u003eUltraLite 5\/8\" Front Hub with 1\/4\" Bullet Tip Studs for Precision Kart Handling\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralight-right-rear-double-lock-hub-1-4-hardware-only-pm-38dl-1-4\"\u003eUltralight Right Rear Double Lock Hub Designed for 1\/4 Inch Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Performance Mfg","offers":[{"title":"Default Title","offer_id":52562620449086,"sku":"PM-39F-1\/4","price":34.84,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/wheelshubsbyperformancemfg-ultrafree-left-front-wheel-hub-with-1-4-hardware-pm-39f-1-4.jpg?v=1763112993"},{"product_id":"metric-pattern-front-hub-with-5-8-bearings-5-16-hardware-only-pm-39f-58m","title":"Performance Mfg Metric Front Hub - 5\/8\" Bearings \u0026 5\/16\" Hardware - All Classes","description":"\u003cp\u003eMaximizing front-end rigidity and minimizing lateral deflection is critical when sourcing racing go kart parts for high-load cornering. The Performance Mfg Metric Pattern Front Hub is engineered specifically to withstand the punishing lateral forces generated on modern sprint tracks. Built around heavy-duty 5\/8-inch precision bearings, this hub eliminates the spindle flex and wheel wobble that plague standard setups, ensuring your steering inputs translate directly to the asphalt with absolute reliability.\u003c\/p\u003e\u003ch2\u003eHandling the Output of a Motor Engine\u003c\/h2\u003e\u003cp\u003eWhen you are pushing the limits of your chassis, especially when dealing with the torque and speed of a high-performance motor engine, structural reliability is non-negotiable. This hub utilizes a robust single-pattern metric design tailored for 5\/16-inch hardware, providing a rock-solid mounting surface for your wheels. Whether you are managing the precise briggs and stratton lo206 horsepower curve or running high-revving two-strokes, this front hub ensures your front geometry remains perfectly aligned lap after grueling lap without fatiguing the metal.\u003c\/p\u003e\u003ch2\u003eMaximizing Top Tire Grip and Track Efficiency\u003c\/h2\u003e\u003cp\u003eDurability extends beyond just surviving the race; it means maintaining peak efficiency from the moment you leave the grid until you are packing up your fuel cans at the end of the weekend. The oversized 5\/8-inch bearings significantly reduce rolling resistance and heat buildup, preventing bearing failure during extended endurance runs. By keeping the wheel perfectly true under heavy loads, this hub maximizes your top tire contact patch, reducing uneven wear and delivering the predictable, razor-sharp turn-in required to dominate the apex.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-Duty 5\/8\" Bearings:\u003c\/strong\u003e Oversized precision bearings drastically increase load capacity and prevent premature failure under heavy lateral G-forces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetric Bolt Pattern:\u003c\/strong\u003e Precision-machined for standard metric wheels, ensuring a flush, secure fitment with 5\/16\" mounting hardware.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBillet Aluminum Construction:\u003c\/strong\u003e CNC-machined from high-grade alloy to provide maximum structural strength while keeping rotational mass to an absolute minimum.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced Rolling Resistance:\u003c\/strong\u003e High-quality bearing integration minimizes friction, translating more momentum into straight-line speed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Tire Wear:\u003c\/strong\u003e Eliminates wheel wobble and spindle deflection, keeping your contact patch consistent for extended tire life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Stability:\u003c\/strong\u003e Engineered to dissipate heat effectively, preventing bearing lock-up during prolonged, high-speed track sessions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Steering Feedback:\u003c\/strong\u003e Enhances chassis responsiveness by removing slop from the front-end assembly, allowing for surgical precision in hairpins.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFor professional pit crews and privateer racers alike, the Performance Mfg front hub simplifies trackside maintenance. The straightforward installation process means less time wrenching and more time dialing in your setup. When you demand parts that outlast the competition and refuse to compromise on structural integrity, this metric hub is the definitive choice for your front-end assembly.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this hub compatible with all kart chassis types?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This hub is designed for standard metric-pattern wheels and utilizes 5\/8-inch bearings. It is compatible with most sprint and oval kart spindles that accept a 5\/8-inch bearing setup. Please verify your spindle diameter before purchase.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What size hardware does this hub use?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This specific model is machined for 5\/16-inch wheel mounting hardware, providing a secure, high-strength fit for competitive racing applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does the 5\/8-inch bearing improve performance?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The oversized 5\/8-inch bearings offer increased load capacity and reduced rolling resistance compared to smaller standard bearings. This helps minimize heat buildup and prevents wheel wobble during high-G cornering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this hub suitable for both 4-cycle and 2-cycle racing?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the billet aluminum construction is engineered to handle the torque and speed of various engine types, from the Briggs \u0026amp; Stratton LO206 to high-revving two-stroke engines.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What maintenance is required for these hubs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e To ensure peak performance, periodically inspect the bearings for smooth rotation and check that the 5\/16-inch hardware is torqued correctly. Keep the hub clean of debris to maintain thermal stability during long track sessions.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/metric-pattern-front-hub-with-17mm-bearings-5-16-hardware-only-pm-39f-17m\"\u003eMetric Pattern Front Hub Featuring 17mm Bearings and 5\/16 Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralite-5-8-front-hub-5-16-hardware-only-pm-39-5-16\"\u003eUltraLite 5\/8\" Front Hub with 5\/16\" Hardware and Rubber Sealed Bearings\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralite-5-8-front-hub-1-4-hardware-only-bullet-tip-studs-pm-39-1-4\"\u003eUltraLite 5\/8\" Front Hub with 1\/4\" Bullet Tip Studs for Precision Kart Handling\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultrafree-left-front-stepped-wheel-hub-with-1-4-hardware-pm-39stfl-1-4\"\u003ePerformance Mfg UltraFree Left Front Stepped Hub - 1\/4\" Hardware - Oval Racing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/pm-3-19-metric-toe-lock-19mm-pm-3-19\"\u003e19mm Metric Toe Lock for Kart Steering Alignment\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Performance Mfg","offers":[{"title":"Default Title","offer_id":52562632966462,"sku":"PM-39F-58M","price":53.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/wheelshubsbyperformancemfg-metric-pattern-front-hub-with-5-8-bearings-5-16-hardware-only-pm-39f-58m.jpg?v=1763113279"},{"product_id":"40mm-pmi-rear-wheel-hub-w-dual-patterns-pm-38-40","title":"Performance Mfg PMI 40mm Dual Pattern Rear Wheel Hub - Single Lock - All Classes","description":"\u003cp\u003eMaximizing rear-end grip and trackside adaptability is non-negotiable when sourcing the best go karts and parts for your racing program. The Performance Mfg (PMI) 40mm Dual Pattern Rear Wheel Hub eliminates the need to carry duplicate spares by seamlessly bridging USA and metric wheel bolt patterns. By simply removing the precision-machined index ring, you can instantly swap between domestic and imported rims without drilling, specialized tools, or compromising concentricity.\u003c\/p\u003e\n\n\u003ch2\u003ePrecision Hubs for Wheels: USA \u0026amp; Metric Compatibility\u003c\/h2\u003e\n\u003cp\u003eWhen evaluating hubs for wheels, rigidity and clamping force are paramount to ensuring power transfers directly to your go kart tires without deflection. This single-lock style hub utilizes robust dual pinch bolts to clamp securely onto your 40mm axle, maintaining perfect alignment under heavy lateral loads. Whether you are bolting on parts new from the factory or tuning a chassis you just found while searching for go karts for sale near me, this hub provides the versatility required for mixed-standard events and diverse team inventories.\u003c\/p\u003e\n\n\u003ch2\u003eOptimizing Go Kart Tires and Rear Axle Power Delivery\u003c\/h2\u003e\n\u003cp\u003eTrack conditions change rapidly, and your ability to adapt dictates your position on the podium. The PMI 40mm dual pattern hub streamlines your pit stops, allowing mechanics to mount American rims for local club races or metric wheels for regional and national imports. The even bolt tension engineered into this hub minimizes wheel distortion under heavy cornering loads, preserving the integrity of your rims and ensuring consistent contact patches.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual-Pattern Design:\u003c\/strong\u003e Seamlessly accommodates both USA and metric wheel bolt patterns via a removable index ring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle Lock Clamping:\u003c\/strong\u003e Features heavy-duty dual pinch bolts for superior 40mm axle retention and zero slip under acceleration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Hardware:\u003c\/strong\u003e Comes standard with high-strength 5\/16-24 wheel studs and nuts for immediate trackside mounting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTether Ready:\u003c\/strong\u003e Pre-drilled and prepped for a 5\/16-18 set screw to securely anchor your axle key or safety tether.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBillet Aluminum Construction:\u003c\/strong\u003e CNC-machined in the USA to minimize rotational mass while maximizing structural integrity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Application:\u003c\/strong\u003e Ideal for 40mm axles across multiple chassis brands, reducing the need for redundant pit equipment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced Tire Tuning:\u003c\/strong\u003e Allows rapid wheel swaps to test different offsets and tire compounds on the fly.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv style=\"text-align: center; color: #cc0000 !important; font-size: 1.4em;\"\u003eWe did not have a High Resolution of this item, this item picture may be different, but the description and title is accurate. The first two images are AI generated. The third image is accurate, but is not high resolution. Email if you would like a more detail picture before ordering.\u003c\/div\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I switch between USA and metric wheel patterns on this hub?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This hub features a removable precision-machined index ring. Simply remove the ring to transition between the two bolt patterns, allowing you to mount different rim standards without needing specialized tools or drilling.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this hub compatible with all 40mm axles?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, this hub is designed for standard 40mm kart axles. It utilizes a robust dual pinch bolt system to ensure a secure, slip-free fit across various chassis brands.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this hub come with the necessary hardware for mounting?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the hub includes high-strength 5\/16-24 wheel studs and nuts, making it ready for immediate trackside installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this hub for both club and regional racing?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Absolutely. The dual-pattern design is specifically engineered to help racers adapt to different event requirements, such as using American rims for local club races and metric wheels for regional or national imports, without needing to swap out your entire hub assembly.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the purpose of the pre-drilled hole on the hub?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The hub is pre-drilled and prepped for a 5\/16-18 set screw, which allows you to securely anchor your axle key or safety tether to prevent movement during high-speed operation.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/40mm-pmi-rear-wheel-hub-w-dual-patterns-double-lock-style-pm-38dl-40\"\u003e40mm PMI Double Lock Rear Wheel Hub with Dual Patterns for Secure Racing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralight-right-rear-double-lock-hub-5-16-hardware-only-pm-38dl-5-16\"\u003eUltralight Right Rear Double Lock Hub for 5\/16 Inch Hardware Strength\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralight-right-rear-double-lock-hub-1-4-hardware-only-pm-38dl-1-4\"\u003eUltralight Right Rear Double Lock Hub Designed for 1\/4 Inch Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultrafree-left-front-stepped-wheel-hub-with-1-4-hardware-pm-39stfl-1-4\"\u003ePerformance Mfg UltraFree Left Front Stepped Hub - 1\/4\" Hardware - Oval Racing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/metric-pattern-front-hub-with-17mm-bearings-5-16-hardware-only-pm-39f-17m\"\u003eMetric Pattern Front Hub Featuring 17mm Bearings and 5\/16 Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Performance Mfg","offers":[{"title":"Default Title","offer_id":52562634178878,"sku":"PM-38-40","price":44.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/40mm-pmi-rear-wheel-hub-w-dual-patterns-pm-38-40_1.jpg?v=1773104943"},{"product_id":"ultralight-right-rear-double-lock-hub-1-4-hardware-only-pm-38dl-1-4","title":"Ultralight Right Rear Double Lock Hub Designed for 1\/4 Inch Hardware","description":"\u003cstrong\u003eSecure every mile\u003c\/strong\u003e with the ultralight right rear double lock hub, tailored for 1\/4-inch hardware only. This innovative locking mechanism prevents wheel movement, ensuring your kart stays planted during high-speed runs.\u003cp\u003eThe double lock feature engages firmly, distributing forces evenly to enhance traction and reduce spin-outs. Its ultralight composition shaves grams off your setup, directly boosting top-end velocity.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eLockdown Reliability: Dual points secure the wheel against vibrations and shocks.\u003c\/li\u003e\n\u003cli\u003eEffortless Power Transfer: Minimizes slippage for immediate throttle response.\u003c\/li\u003e\n\u003cli\u003eStreamlined Maintenance: Hardware compatibility simplifies rear-end servicing.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eRacers love how it maintains alignment under load, leading to predictable handling that builds speed lap by lap. For trackside efficiency, the design promotes quick inspections and adjustments, keeping your team organized.\u003c\/p\u003e\u003cp\u003eWhether on asphalt or dirt, this hub handles the torque of powerful engines without faltering. SKU: PM-38DL-1\/4 – the pinnacle of rear security and lightness.\u003c\/p\u003e\u003cp\u003eIt's a small upgrade with big impacts, from smoother drifts to conserved energy.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this hub compatible with 5\/16 inch hardware?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e No, this specific model (PM-38DL-1\/4) is precision-engineered exclusively for 1\/4 inch hardware. If you require 5\/16 inch compatibility, please select the corresponding 5\/16 inch version.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the benefit of the double lock mechanism?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The double lock feature provides dual points of contact to secure the wheel. This design significantly reduces vibrations and prevents wheel movement under high-torque loads, ensuring your alignment remains consistent throughout the race.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does an ultralight hub improve kart performance?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e By reducing unsprung weight, this hub helps decrease rotational mass. This allows for faster acceleration and improved throttle response, helping you maintain higher top-end velocity on the track.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this hub on both dirt and asphalt tracks?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the robust construction of this hub is designed to handle the torque and stress of powerful engines on both asphalt and dirt surfaces without faltering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this hub require special maintenance?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The hub is designed for streamlined maintenance. We recommend regular inspections of the hardware and locking points before and after race sessions to ensure the double lock mechanism remains secure and free of debris.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralight-right-rear-double-lock-hub-5-16-hardware-only-pm-38dl-5-16\"\u003eUltralight Right Rear Double Lock Hub for 5\/16 Inch Hardware Strength\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/40mm-pmi-rear-wheel-hub-w-dual-patterns-double-lock-style-pm-38dl-40\"\u003e40mm PMI Double Lock Rear Wheel Hub with Dual Patterns for Secure Racing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralight-right-front-stepped-hub-1-4-hardware-only-pm-39st-1-4\"\u003eUltralight Right Front Stepped Hub with 1\/4\" Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultrafree-left-front-wheel-hub-with-1-4-hardware-pm-39f-1-4\"\u003eUltraFree Left Front Hub Equipped with 1\/4 Inch Hardware for Karts\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralite-5-8-front-hub-1-4-hardware-only-bullet-tip-studs-pm-39-1-4\"\u003eUltraLite 5\/8\" Front Hub with 1\/4\" Bullet Tip Studs for Precision Kart Handling\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Performance Mfg","offers":[{"title":"Default Title","offer_id":52562636407102,"sku":"PM-38DL-1\/4","price":32.82,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/wheelshubsbyperformancemfg-ultralight-right-rear-double-lock-hub-1-4-hardware-only-pm-38dl-1-4.jpg?v=1763113358"},{"product_id":"ultralight-right-rear-double-lock-hub-5-16-hardware-only-pm-38dl-5-16","title":"Ultralight Right Rear Double Lock Hub for 5\/16 Inch Hardware Strength","description":"\u003cp\u003eFacing rear wheel instability? Solve it head-on with the ultralight right rear double lock hub, built for 5\/16-inch hardware. The double lock system clamps down tightly, eliminating play for superior drive train efficiency.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced Grip:\u003c\/strong\u003e Locks wheels firmly to maximize rear traction in all conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eLightweight Advantage:\u003c\/b\u003e Reduces overall mass for quicker launches and braking.\u003c\/li\u003e\n\u003cli\u003eHardware Precision: 5\/16 compatibility ensures robust, vibration-resistant fastening.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThis hub's design promotes even power delivery, helping you maintain momentum through long straights. It also aids in keeping your kart's rear end balanced, which is crucial for consistent corner speeds.\u003c\/p\u003e\u003cp\u003eOrganizationally, it's a win: easy to torque and check, fitting into routine maintenance without fuss. Performance Mfg's ultralight approach means more focus on racing, less on weight worries.\u003c\/p\u003e\u003cp\u003eUsers highlight its role in preventing loose wheels during endurance events. SKU: PM-38DL-5\/16 delivers the security needed for pushing limits safely.\u003c\/p\u003e\u003cp\u003eUpgrade and feel the difference in rear-end confidence.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why should I choose a double lock hub over a standard single lock hub?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The double lock system provides superior clamping force, which eliminates wheel play and ensures the hub remains securely fastened to the axle. This is critical for maintaining consistent rear-end stability and preventing loose wheels during high-stress endurance racing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this hub compatible with all kart axles?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This hub is specifically engineered for 5\/16-inch hardware. Please verify your axle diameter and current hardware setup to ensure compatibility before installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does the ultralight design affect my kart's performance?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e By reducing unsprung weight, this hub helps decrease rotational mass. This allows for quicker acceleration out of corners and more responsive braking, giving you a competitive edge in lap times.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What maintenance is required for the PM-38DL-5\/16 hub?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Because of its robust design, maintenance is straightforward. Regularly check the torque on your 5\/16-inch hardware before each session to ensure the double lock mechanism is fully engaged and vibration-free.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralight-right-rear-double-lock-hub-1-4-hardware-only-pm-38dl-1-4\"\u003eUltralight Right Rear Double Lock Hub Designed for 1\/4 Inch Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/40mm-pmi-rear-wheel-hub-w-dual-patterns-double-lock-style-pm-38dl-40\"\u003e40mm PMI Double Lock Rear Wheel Hub with Dual Patterns for Secure Racing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralight-right-front-stepped-hub-5-16-hardware-only-pm-39st-5-16\"\u003eUltralight Right Front Stepped Hub with 5\/16\" Hardware and Bearings\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/metric-pattern-front-hub-with-17mm-bearings-5-16-hardware-only-pm-39f-17m\"\u003eMetric Pattern Front Hub Featuring 17mm Bearings and 5\/16 Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/17mm-front-hub-usa-pattern-5-16-hardware-only-included-pm-39f-17us\"\u003e17mm USA Pattern Front Hub with Included 5\/16\" Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Performance Mfg","offers":[{"title":"Default Title","offer_id":52562636439870,"sku":"PM-38DL-5\/16","price":32.82,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/wheelshubsbyperformancemfg-ultralight-right-rear-double-lock-hub-5-16-hardware-only-pm-38dl-5-16.jpg?v=1763113360"},{"product_id":"40mm-pmi-rear-wheel-hub-w-dual-patterns-double-lock-style-pm-38dl-40","title":"40mm PMI Double Lock Rear Wheel Hub with Dual Patterns for Secure Racing","description":"\u003cul\u003e\n\u003cli\u003eDouble lock mechanism with four pinch bolts for ultimate axle grip in demanding conditions.\u003c\/li\u003e\n\u003cli\u003eDual patterns support both USA and metric wheels via removable index ring.\u003c\/li\u003e\n\u003cli\u003eFull 5\/16-24 hardware kit included for out-of-box readiness.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDouble the security, single the hassle—this 40mm PMI rear hub redefines reliability for serious kart builders. The four-bolt clamping system distributes force evenly, eliminating the slip that plagues lesser designs during hard launches or sudden direction changes. Versatile patterning means you're never wheel-locked at international meets; just pop off the ring for metric fitment.\u003c\/p\u003e\u003cp\u003ePerformance Mfg's attention to detail shows in the hub's balanced machining, which aids in smoother rotation and less energy waste. For endurance racers, this translates to cooler-running rears and extended component life. Track engineers praise its role in fine-tuning offset, where precise locking prevents camber shifts that upset balance.\u003c\/p\u003e\u003cp\u003eInstallation is a breeze, but the real win is in race-day confidence—know your rear end won't budge, so you can attack corners with full commitment. It organizes axle work efficiently, as the double lock reduces the need for constant re-torquing. Compatible with tethers or keys via set screw hole (not included), it fits safety regs effortlessly.\u003c\/p\u003e\u003cp\u003eElevate from standard to superior; this hub's engineering helps shave fractions off laps through unwavering traction. Ideal for 40mm setups in LO206 or similar classes. SKU: PM-38DL-40. Lock in victory.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I switch between USA and metric wheel patterns?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This hub features a removable index ring. Simply remove the ring to transition the hub from a USA pattern to a metric pattern, allowing you to use a wider variety of wheel brands without needing to replace the entire hub.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why is the double lock mechanism better than a standard hub?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The double lock system utilizes four pinch bolts to distribute clamping force evenly across the axle. This prevents the hub from slipping during hard launches or aggressive cornering, ensuring your rear end remains stable and consistent throughout the race.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this hub come with the necessary hardware?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, this 40mm PMI rear hub includes a full 5\/16-24 hardware kit, making it ready for installation right out of the box.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this hub with a keyway or tether system?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the hub includes a set screw hole that is compatible with standard tethers or keys, helping you meet safety regulations for your specific racing class.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will this hub fit my 40mm axle?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, this hub is precision-machined specifically for 40mm axle setups, making it an ideal upgrade for LO206 and similar karting classes.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/40mm-pmi-rear-wheel-hub-w-dual-patterns-pm-38-40\"\u003e40mm-pmi-rear-wheel-hub-w-dual-patterns-pm-38-40\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralight-right-rear-double-lock-hub-5-16-hardware-only-pm-38dl-5-16\"\u003eUltralight Right Rear Double Lock Hub for 5\/16 Inch Hardware Strength\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralight-right-rear-double-lock-hub-1-4-hardware-only-pm-38dl-1-4\"\u003eUltralight Right Rear Double Lock Hub Designed for 1\/4 Inch Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/pm-116116-seat-weight-bolt-mounting-kit-pm-116116\"\u003eDurable Seat Weight Bolt Mounting Kit for Kart Longevity\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Performance Mfg","offers":[{"title":"Default Title","offer_id":52562636636478,"sku":"PM-38DL-40","price":52.74,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/standardwheelhubsrear-40mm-pmi-rear-wheel-hub-w-dual-patterns-double-lock-style-pm-38dl-40.jpg?v=1763113364"},{"product_id":"ultralite-5-8-front-hub-1-4-hardware-only-bullet-tip-studs-pm-39-1-4","title":"UltraLite 5\/8\" Front Hub with 1\/4\" Bullet Tip Studs for Precision Kart Handling","description":"\u003cp\u003ePrecision engineering meets lightweight design in this UltraLite 5\/8\" Front Hub, tailored for kart racers who demand every ounce of speed. Crafted from high-strength aluminum, it minimizes rotational mass to let your kart accelerate quicker out of corners and maintain momentum through straightaways. The 1\/4\" hardware compatibility allows seamless integration with existing wheel systems, while bullet tip studs provide secure, vibration-free mounting that withstands the rigors of high-speed racing.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eUltra-light construction reduces unsprung weight, improving suspension response and handling precision.\u003c\/li\u003e\n\u003cli\u003eBullet tip studs ensure easy wheel installation and removal, saving precious time during pit stops.\u003c\/li\u003e\n\u003cli\u003eCompatible with 5\/8\" axles, ideal for front-wheel applications in sprint and road course karts.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eWhether you're navigating tight tracks or pushing limits in endurance races, this hub helps optimize your setup for better tire contact and reduced drag. Racers report noticeable improvements in cornering speed, thanks to the hub's balanced design that promotes even weight distribution. For those upgrading from heavier stock hubs, the difference in track feel is immediate—sharper steering and less fatigue on longer sessions.\u003c\/p\u003e\u003cp\u003eBuilt to last with corrosion-resistant finishes, it's a reliable choice for both junior and senior divisions. Pair it with performance bearings for maximum efficiency. SKU: PM-39-1\/4. Elevate your kart's front-end performance and shave seconds off your personal bests with this essential component.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this hub compatible with all kart chassis?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This UltraLite hub is designed for 5\/8\" spindles, which is a standard size for many sprint and road course karts. Please verify your spindle diameter before purchasing to ensure a proper fit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why should I choose 1\/4\" hardware over 5\/16\"?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The 1\/4\" hardware is ideal for racers looking to minimize rotating mass and unsprung weight. It is the preferred choice for classes where every ounce counts toward acceleration and steering responsiveness.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do the bullet tip studs help during pit stops?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The tapered bullet tip design acts as a guide, allowing you to slide your wheel onto the hub studs much faster than with standard flat-ended studs, significantly reducing the time required for tire changes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What maintenance is required for these hubs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e To maintain peak performance, periodically inspect the studs for any signs of wear or bending. We recommend cleaning the hub assembly after race days and ensuring your bearings are properly greased to maintain smooth rotation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this hub for both junior and senior divisions?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the high-strength aluminum construction is engineered to be durable enough for both junior and senior racing divisions while providing the weight savings required for competitive setups.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralite-5-8-front-hub-5-16-hardware-only-pm-39-5-16\"\u003eUltraLite 5\/8\" Front Hub with 5\/16\" Hardware and Rubber Sealed Bearings\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultrafree-left-front-wheel-hub-with-1-4-hardware-pm-39f-1-4\"\u003eUltraFree Left Front Hub Equipped with 1\/4 Inch Hardware for Karts\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralight-right-front-stepped-hub-1-4-hardware-only-pm-39st-1-4\"\u003eUltralight Right Front Stepped Hub with 1\/4\" Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultrafree-left-front-stepped-wheel-hub-with-1-4-hardware-pm-39stfl-1-4\"\u003ePerformance Mfg UltraFree Left Front Stepped Hub - 1\/4\" Hardware - Oval Racing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultrafree-right-front-stepped-wheel-hub-with-1-4-hardware-pm-39stf-1-4\"\u003ePerformance Mfg UltraFree Right Front Stepped Hub - 1\/4\" Hardware - Racing Spec\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Performance Mfg","offers":[{"title":"Default Title","offer_id":52562647056702,"sku":"PM-39-1\/4","price":32.82,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/standardwheelhubsfront-ultralite-5-8-front-hub-1-4-hardware-only-bullet-tip-studs-pm-39-1-4.jpg?v=1763113571"},{"product_id":"ultralite-5-8-front-hub-5-16-hardware-only-pm-39-5-16","title":"UltraLite 5\/8\" Front Hub with 5\/16\" Hardware and Rubber Sealed Bearings","description":"\u003cul\u003e\n\u003cli\u003eEquipped with dual rubber sealed 5\/8\" ID bearings for smooth, low-friction rotation that cuts down on power loss.\u003c\/li\u003e\n\u003cli\u003eSingle bolt pattern designed exclusively for 5\/16-24 hardware, ensuring a rock-solid connection to your wheels.\u003c\/li\u003e\n\u003cli\u003eComplete kit includes three bullet tip 5\/16\" bolts and matching serrated flange nuts for hassle-free assembly.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eBlack anodized finish not only looks sleek but also provides robust protection against track-side elements, keeping your hub performing lap after lap. This front hub shines in high-stakes environments where every detail counts—think quicker response times during aggressive overtakes or stable handling through chicanes. By shedding unnecessary weight, it allows your kart's engine to focus on propulsion rather than overcoming inertia.\u003c\/p\u003e\u003cp\u003eIdeal for teams running offset chassis or those fine-tuning for specific track conditions, the UltraLite hub integrates effortlessly into most standard front axle setups. Maintenance is simplified with sealed bearings that repel dirt and moisture, extending service intervals and keeping you on the track longer. Racers appreciate the confidence it instills, knowing their wheels stay secure even under maximum lateral loads.\u003c\/p\u003e\u003cp\u003eTransform your kart's dynamics with this precision piece. Whether chasing podium finishes or honing skills in practice, the benefits compound: faster acceleration, better fuel efficiency from reduced drag, and an overall edge in competitive fields. SKU: PM-39-5\/16. Invest in reliability that propels you ahead.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What size bearings are included with this hub?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This hub comes equipped with dual rubber-sealed 5\/8\" ID bearings, designed to provide smooth, low-friction rotation while keeping dirt and moisture out.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this hub come with the necessary wheel hardware?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, this kit is complete. It includes three bullet-tip 5\/16\"-24 bolts and matching serrated flange nuts for a secure, hassle-free installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this hub compatible with all kart chassis?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The UltraLite hub is designed to integrate effortlessly into most standard front axle setups. It is particularly ideal for teams running offset chassis or those looking to fine-tune handling for specific track conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I maintain the bearings in this hub?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The included rubber-sealed bearings are designed to repel track-side elements, which helps extend service intervals. Simply inspect them periodically for smooth rotation and ensure the hub remains clean after racing in wet or dusty conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why should I choose this hub over a standard steel version?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This hub is engineered to shed unnecessary weight, which reduces inertia and allows your engine to focus more power on propulsion. The black anodized finish also provides superior protection against corrosion compared to standard finishes.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/metric-pattern-front-hub-with-5-8-bearings-5-16-hardware-only-pm-39f-58m\"\u003ePerformance Mfg Metric Front Hub - 5\/8\" Bearings \u0026amp; 5\/16\" Hardware - All Classes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralite-5-8-front-hub-1-4-hardware-only-bullet-tip-studs-pm-39-1-4\"\u003eUltraLite 5\/8\" Front Hub with 1\/4\" Bullet Tip Studs for Precision Kart Handling\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/17mm-front-hub-usa-pattern-5-16-hardware-only-included-pm-39f-17us\"\u003e17mm USA Pattern Front Hub with Included 5\/16\" Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/metric-pattern-front-hub-with-17mm-bearings-5-16-hardware-only-pm-39f-17m\"\u003eMetric Pattern Front Hub Featuring 17mm Bearings and 5\/16 Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/pm-116116-seat-weight-bolt-mounting-kit-pm-116116\"\u003eDurable Seat Weight Bolt Mounting Kit for Kart Longevity\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Performance Mfg","offers":[{"title":"Default Title","offer_id":52562647122238,"sku":"PM-39-5\/16","price":32.82,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/standardwheelhubsfront-ultralite-5-8-front-hub-5-16-hardware-only-pm-39-5-16.jpg?v=1763113572"},{"product_id":"metric-pattern-front-hub-with-17mm-bearings-5-16-hardware-only-pm-39f-17m","title":"Metric Pattern Front Hub Featuring 17mm Bearings and 5\/16 Hardware","description":"\u003cstrong\u003eUnlock smoother front-wheel dynamics\u003c\/strong\u003e with this metric pattern front hub, pre-installed with high-quality 17mm bearings and designed exclusively for 5\/16 hardware. It accepts only 5\/16-24 fittings, including bullet tip studs and serrated flanged nuts for a rock-solid connection that withstands the rigors of kart racing.\u003cp\u003eThe integrated crush sleeve prevents bearing damage during assembly, promoting longevity and consistent performance. This setup minimizes play in the front wheels, translating to sharper steering responses and quicker lap times—essential for overtaking rivals in tight races.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSeamless Compatibility: Tailored for metric chassis, ensuring easy bolt-on installation without custom modifications.\u003c\/li\u003e\n\u003cli\u003eFriction Reduction: 17mm bearings spin freely, cutting energy loss and enhancing acceleration off the line.\u003c\/li\u003e\n\u003cli\u003eTrack-Ready Durability: Built to handle high RPMs and impacts, keeping your kart organized and pit stops minimal.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eVisualize gliding through chicanes with pinpoint accuracy; this hub makes it possible by stabilizing the front end against road imperfections. For mechanics, the included hardware streamlines wheel changes, saving precious time during practice or race days. Performance Mfg's engineering shines here, focusing on lightweight construction that doesn't sacrifice strength.\u003c\/p\u003e\u003cp\u003eIdeal for both novice and seasoned drivers, it supports fine-tuning camber and toe for personalized handling. The result? A kart that feels alive under your control, pushing boundaries of speed and safety. SKU: PM-39F-17M elevates your setup from standard to superior.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this hub compatible with all kart chassis?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This hub is specifically designed for metric chassis. Please ensure your spindle size is 17mm before purchasing to ensure a proper fit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What hardware is required for this hub?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This hub is engineered exclusively for 5\/16-24 hardware. It is designed to work with bullet tip studs and serrated flanged nuts to ensure a secure, race-ready connection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why is the integrated crush sleeve important?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The crush sleeve is a critical component that prevents the inner races of the bearings from being crushed or damaged when you tighten the axle nut, ensuring the bearings spin freely and last longer.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use 1\/4\" hardware with this hub?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e No, this specific model (PM-39F-17M) is machined specifically for 5\/16\" hardware. Using smaller hardware will result in a loose fit and potential safety issues on the track.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does this hub improve my kart's handling?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e By utilizing high-quality 17mm bearings and a precision-fit design, this hub minimizes front-end play. This reduction in slop provides more direct steering feedback and sharper turn-in response.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/17mm-front-hub-usa-pattern-5-16-hardware-only-included-pm-39f-17us\"\u003e17mm USA Pattern Front Hub with Included 5\/16\" Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/metric-pattern-front-hub-with-5-8-bearings-5-16-hardware-only-pm-39f-58m\"\u003ePerformance Mfg Metric Front Hub - 5\/8\" Bearings \u0026amp; 5\/16\" Hardware - All Classes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/pm-3-19-metric-toe-lock-19mm-pm-3-19\"\u003e19mm Metric Toe Lock for Kart Steering Alignment\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/pm-116116-seat-weight-bolt-mounting-kit-pm-116116\"\u003eDurable Seat Weight Bolt Mounting Kit for Kart Longevity\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Performance Mfg","offers":[{"title":"Default Title","offer_id":52562654527806,"sku":"PM-39F-17M","price":44.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/wheelshubsbyperformancemfg-metric-pattern-front-hub-with-17mm-bearings-5-16-hardware-only-pm-39f-17m.jpg?v=1763113721"},{"product_id":"ultralite-1-25-rear-hub-1-4-hardware-only-pm-38-1-4","title":"Performance Mfg UltraLite 1.25\" Rear Wheel Hub - 1\/4\" Hardware - Sprint\/Oval","description":"\u003cp\u003eReducing rotational mass at the axle transforms how your racing go kart accelerates out of tight corners. The Performance Mfg UltraLite 1.25-inch Rear Hub is engineered specifically for 1\/4-inch hardware, delivering a rock-solid, zero-drag mounting solution that maximizes power transfer from the axle to the track surface. Designed from premium billet aluminum and finished with a durable black anodize, this hub provides the ultimate blend of lightweight efficiency and structural reliability under high-load cornering.\u003c\/p\u003e\u003ch2\u003eMaximizing Output from Kart Racing Engines\u003c\/h2\u003e\u003cp\u003eHigh-horsepower kart racing engines demand drivetrain components that won't flex or fail under extreme torque. By utilizing a precision-machined 1.25-inch bore, this UltraLite hub hugs the axle with zero slop, ensuring that every ounce of engine output is translated directly into forward momentum. The strict adherence to 1\/4-28 tapered wheel studs guarantees hardware simplicity while maintaining the sheer clamping force required for competitive sprint and oval racing. When you are pushing the limits of your chassis, reliability is non-negotiable.\u003c\/p\u003e\u003ch2\u003eThe Ultimate Link to Your Top Tire\u003c\/h2\u003e\u003cp\u003eYour setup is only as good as the connection to your top tire. This rear hub standardizes your rear-end fittings, allowing for rapid wheel changes in the hot pits without sacrificing alignment accuracy. Whether you are bolting up fresh rubber for a qualifying run or managing tire wear during a grueling endurance main, the precision-machined register ensures perfect concentricity. If you happen to be browsing for a new go kart frame for sale to build your dream chassis, integrating these Performance Mfg hubs from day one will guarantee a perfectly squared and balanced rear track.\u003c\/p\u003e\u003ch2\u003eUpgrading Kart Wheels Go Kart Dynamics\u003c\/h2\u003e\u003cp\u003eSymmetric rear dynamics dictate how smoothly your chassis releases off the corner. When upgrading kart wheels go kart handling characteristics improve drastically, provided the hubs can handle the lateral stress. The UltraLite design cuts unnecessary unsprung weight, which allows the axle to flex exactly as the manufacturer intended, promoting smoother drifts and lightning-fast directional recoveries.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision 1.25-Inch Bore:\u003c\/strong\u003e Machined for an exact tolerance fit on 1.25\" axles to eliminate vibration and drag.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\/4-28 Tapered Studs:\u003c\/strong\u003e Utilizes standard 1\/4-inch hardware for lightweight, high-strength wheel retention.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBillet Aluminum Construction:\u003c\/strong\u003e CNC-machined from premium billet for unmatched durability and structural integrity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlack Anodized Finish:\u003c\/strong\u003e Protects against corrosion, track debris, and harsh racing environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltraLite Profile:\u003c\/strong\u003e Significantly reduces rotational mass, allowing for faster acceleration and responsive braking.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZero-Drag Performance:\u003c\/strong\u003e Engineered to maintain perfect concentricity, reducing parasitic power loss at the wheels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Compatibility:\u003c\/strong\u003e Seamlessly integrates with standard US 2.50 pattern wheels for competitive sprint and oval applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this hub compatible with all kart axles?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This hub is precision-machined for a 1.25-inch axle. Please ensure your kart chassis utilizes a 1.25\" rear axle before purchasing, as it will not fit standard 40mm or 50mm axles.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this hub come with the wheel nuts?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This product includes the 1\/4-28 tapered wheel studs as specified. Please verify that your current wheel nuts are compatible with 1\/4-28 thread pitch hardware.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this hub for both sprint and oval racing?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the UltraLite hub is designed for universal compatibility with standard US 2.50 pattern wheels, making it an excellent choice for both competitive sprint and oval track applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does reducing rotational mass help my kart's performance?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e By reducing unsprung, rotational weight at the axle, the engine can accelerate the wheels more efficiently. This results in quicker acceleration out of corners and more responsive braking performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What maintenance is required for these billet aluminum hubs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Periodically inspect the studs for wear and ensure the hub remains clean of track debris. The black anodized finish provides excellent corrosion resistance, but we recommend checking the set screws or clamping hardware regularly to ensure they remain tight under high-load cornering.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/40mm-pmi-rear-wheel-hub-w-dual-patterns-double-lock-style-pm-38dl-40\"\u003e40mm PMI Double Lock Rear Wheel Hub with Dual Patterns for Secure Racing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultrafree-left-front-stepped-wheel-hub-with-1-4-hardware-pm-39stfl-1-4\"\u003ePerformance Mfg UltraFree Left Front Stepped Hub - 1\/4\" Hardware - Oval Racing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultrafree-right-front-stepped-wheel-hub-with-1-4-hardware-pm-39stf-1-4\"\u003ePerformance Mfg UltraFree Right Front Stepped Hub - 1\/4\" Hardware - Racing Spec\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralight-right-front-stepped-hub-1-4-hardware-only-pm-39st-1-4\"\u003eUltralight Right Front Stepped Hub with 1\/4\" Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultrafree-left-front-wheel-hub-with-1-4-hardware-pm-39f-1-4\"\u003eUltraFree Left Front Hub Equipped with 1\/4 Inch Hardware for Karts\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Performance Mfg","offers":[{"title":"Default Title","offer_id":52562688999742,"sku":"PM-38-1\/4","price":27.84,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/wheelshubsbyperformancemfg-ultralite-1-25-rear-hub-1-4-hardware-only-pm-38-1-4.jpg?v=1763114385"},{"product_id":"ultrafree-left-front-stepped-wheel-hub-with-1-4-hardware-pm-39stfl-1-4","title":"Performance Mfg UltraFree Left Front Stepped Hub - 1\/4\" Hardware - Oval Racing","description":"\u003cp\u003ePrecision cornering in competitive racing demands front-end geometry that eliminates scrub and maximizes turn-in response. The Performance Mfg UltraFree Left Front Stepped Hub is engineered specifically for stepped spindles, allowing tuners to dial in exact wheel positioning and customizable camber settings. When you are pushing the limits on dirt ovals or paved circuits, reducing rotational inertia at the front left wheel translates directly to effortless steering and preserved momentum through technical sections.\u003c\/p\u003e\u003ch2\u003eOptimizing Chassis Dynamics Beyond Mounts Engine and Belt Engine Components\u003c\/h2\u003e\u003cp\u003eWhile many builders focus heavily on power delivery—obsessing over the perfect belt engine setup or rigid mounts engine configurations—true lap time reductions often hide in the unsprung weight and rolling resistance of your chassis. This lightweight aluminum stepped hub cuts down on that critical rotational mass. By accommodating varying offsets, it ensures your kart's front left wheel performs optimally under heavy lateral loads. It is not just about straight-line speed; it is about maintaining a featherlight touch on the wheel while carving corners.\u003c\/p\u003e\u003ch2\u003eSeamless Integration with Master Cylinder Brake Parts and Premium Rubber\u003c\/h2\u003e\u003cp\u003eA well-balanced kart requires absolute harmony between your steering, braking, and grip. The UltraFree stepped hub integrates flawlessly into your front-end assembly, working in tandem with your master cylinder brake parts to ensure stable, predictable deceleration before turn-in. Furthermore, when paired with the best go kart tires for racing, this hub's precise offset capabilities allow the tire profile to maintain an optimal contact patch, significantly reducing tire wear and heat degradation over a long feature race.\u003c\/p\u003e\u003ch2\u003eUltraFree Left Front Stepped Hub Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStepped Spindle Compatibility:\u003c\/strong\u003e Precision-machined specifically for stepped spindles to allow micro-adjustments in wheel offset.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight Aluminum Construction:\u003c\/strong\u003e Drastically reduces rotational inertia for sharper, more responsive steering inputs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\/4-Inch Hardware Included:\u003c\/strong\u003e Comes complete with high-grade 1\/4\" studs and nuts for immediate, secure installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeft-Side Specific Geometry:\u003c\/strong\u003e Optimized for the unique load transfers experienced on the left front during oval track cornering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomizable Camber Tuning:\u003c\/strong\u003e Enables advanced chassis tuners to dial in exact camber settings to minimize tire scrub.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProfessional-Grade Durability:\u003c\/strong\u003e Machined by Performance Mfg to withstand the brutal lateral forces of competitive karting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFriction-Reducing Design:\u003c\/strong\u003e The UltraFree bearing spacing promotes free-spinning performance to maximize straightaway speed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why should I choose a stepped hub over a standard wheel hub?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The stepped design is specifically engineered for stepped spindles, allowing for precise micro-adjustments in wheel offset and camber. This is critical for oval racing where fine-tuning your front-end geometry can significantly improve turn-in response and reduce tire scrub.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this hub come ready to install?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, this hub includes high-grade 1\/4\" studs and nuts, ensuring you have the necessary hardware for a secure and immediate installation onto your kart's front end.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does reducing rotational inertia at the front wheel help my lap times?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e By using lightweight aluminum construction, this hub reduces unsprung weight. Less rotational mass means the steering feels more responsive and the kart maintains momentum more effectively through technical corners and transitions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this hub compatible with all kart spindles?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This hub is precision-machined specifically for stepped spindles. Please verify your spindle type before purchase to ensure proper fitment and alignment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can this hub help with tire wear?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Absolutely. By allowing for customizable camber settings, you can optimize the tire's contact patch with the track surface. A better contact patch prevents uneven heat buildup and excessive tire degradation during long feature races.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultrafree-right-front-stepped-wheel-hub-with-1-4-hardware-pm-39stf-1-4\"\u003ePerformance Mfg UltraFree Right Front Stepped Hub - 1\/4\" Hardware - Racing Spec\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultrafree-left-front-wheel-hub-with-1-4-hardware-pm-39f-1-4\"\u003eUltraFree Left Front Hub Equipped with 1\/4 Inch Hardware for Karts\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/metric-pattern-front-hub-with-17mm-bearings-5-16-hardware-only-pm-39f-17m\"\u003eMetric Pattern Front Hub Featuring 17mm Bearings and 5\/16 Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/17mm-front-hub-usa-pattern-5-16-hardware-only-included-pm-39f-17us\"\u003e17mm USA Pattern Front Hub with Included 5\/16\" Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralite-5-8-front-hub-1-4-hardware-only-bullet-tip-studs-pm-39-1-4\"\u003eUltraLite 5\/8\" Front Hub with 1\/4\" Bullet Tip Studs for Precision Kart Handling\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Performance Mfg","offers":[{"title":"Default Title","offer_id":52562702401854,"sku":"PM-39STFL-1\/4","price":46.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/wheelshubsbyperformancemfg-ultrafree-left-front-stepped-wheel-hub-with-1-4-hardware-pm-39stfl-1-4.jpg?v=1763114520"},{"product_id":"ultrafree-right-front-stepped-wheel-hub-with-1-4-hardware-pm-39stf-1-4","title":"Performance Mfg UltraFree Right Front Stepped Hub - 1\/4\" Hardware - Racing Spec","description":"\u003cp\u003ePrecision engineering separates podium finishers from the pack, and integrating premium kart parts like the Performance Mfg UltraFree Right Front Stepped Hub is critical for dialing in your chassis geometry. The right front corner takes the brunt of the load during aggressive cornering, making it the most vital component for maintaining momentum. By utilizing an innovative stepped design, this hub allows racers to execute rapid, precise track-width adjustments. Fine-tuning your front-end offset directly impacts jacking effect and caster utilization, ensuring your inside rear wheel lifts at the exact right moment for frictionless rotation through the apex.\u003c\/p\u003e\u003ch2\u003eOptimizing Your Setup with Premium Wheels Parts\u003c\/h2\u003e\u003cp\u003eWhen you are pushing the limits of grip, every millimeter of track width matters. This UltraFree stepped hub provides the ultimate adjustability for your kart wheels, allowing you to adapt to changing track conditions instantly. Whether you are running high-bite clay or a rubbered-in sprint track, the ability to shift your wheel position without swapping axles or spacers is a massive advantage. Paired with high-quality go kart wheels tires, this hub translates steering input into immediate, predictable chassis response. The reduced rotational mass means less inertia, translating directly into faster acceleration out of the corner.\u003c\/p\u003e\u003ch2\u003eTechnical Specs \u0026amp; Track Advantages\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdaptive Stepped Geometry:\u003c\/strong\u003e Execute micro-adjustments to wheel offsets to perfectly match track conditions and maximize tire contact patches.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltra-Low Friction Design:\u003c\/strong\u003e The UltraFree bearing configuration minimizes rolling resistance for maximum straight-line acceleration and momentum retention.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\/4-Inch Hardware Included:\u003c\/strong\u003e Ensures a robust, slip-free fitment under extreme high-G cornering loads, preventing wheel shift.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight Aluminum Construction:\u003c\/strong\u003e Significantly reduces rotational inertia and unsprung weight for sharper, more responsive turn-in.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Tire Wear:\u003c\/strong\u003e Promotes even load distribution, extending the life of the best go kart tires for racing and keeping your tire budget in check.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModular Quick-Release Capability:\u003c\/strong\u003e Streamlines pit-lane maintenance and allows for rapid setup changes during high-pressure race days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision CNC Machined:\u003c\/strong\u003e Manufactured by Performance Mfg to exact tolerances, guaranteeing zero runout and vibration-free operation.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eData acquisition systems consistently show that eliminating front-end bind is the key to lower lap times. The Performance Mfg UltraFree hub excels at providing the driver with enhanced feedback, building the confidence needed to hold aggressive lines. Integrate this component into your right-front setup to turn potential handling weaknesses into race-winning strengths.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why should I choose a stepped hub over a standard wheel hub?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The stepped design allows for rapid, precise track-width adjustments. By fine-tuning your front-end offset, you can optimize your kart's jacking effect and caster utilization, which is essential for achieving the correct inside rear wheel lift for better cornering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this hub come with the necessary hardware?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, this Performance Mfg UltraFree hub includes 1\/4\" hardware, ensuring a robust and slip-free fitment that holds up under high-G cornering loads.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does this hub affect my kart's handling?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e By reducing rotational mass and inertia, this hub allows for sharper turn-in and faster acceleration out of corners. It also helps eliminate front-end bind, providing better driver feedback and more predictable chassis response.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this hub compatible with all kart setups?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This hub is designed for precision racing applications. It is ideal for racers looking to make quick adjustments without swapping axles or spacers, making it a versatile tool for both high-bite clay and rubbered-in sprint tracks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What maintenance is required for the UltraFree hub?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Because it is CNC machined to exact tolerances, it requires minimal maintenance. However, you should periodically inspect the bearing configuration to ensure it remains free of debris to maintain the low-friction performance that maximizes your momentum.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultrafree-left-front-stepped-wheel-hub-with-1-4-hardware-pm-39stfl-1-4\"\u003ePerformance Mfg UltraFree Left Front Stepped Hub - 1\/4\" Hardware - Oval Racing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralight-right-front-stepped-hub-1-4-hardware-only-pm-39st-1-4\"\u003eUltralight Right Front Stepped Hub with 1\/4\" Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultrafree-left-front-wheel-hub-with-1-4-hardware-pm-39f-1-4\"\u003eUltraFree Left Front Hub Equipped with 1\/4 Inch Hardware for Karts\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/40mm-pmi-rear-wheel-hub-w-dual-patterns-double-lock-style-pm-38dl-40\"\u003e40mm PMI Double Lock Rear Wheel Hub with Dual Patterns for Secure Racing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralight-right-rear-double-lock-hub-1-4-hardware-only-pm-38dl-1-4\"\u003eUltralight Right Rear Double Lock Hub Designed for 1\/4 Inch Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Performance Mfg","offers":[{"title":"Default Title","offer_id":52562702565694,"sku":"PM-39STF-1\/4","price":41.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/wheelshubsbyperformancemfg-ultrafree-right-front-stepped-wheel-hub-with-1-4-hardware-pm-39stf-1-4.jpg?v=1763114523"},{"product_id":"ultralite-1-25-rear-hub-5-16-hardware-only-pm-38-5-16","title":"UltraLite 1.25 Inch Rear Hub with 5\/16 Inch Hardware and Pinch Bolt","description":"Discover streamlined rear performance in the UltraLite 1.25-inch rear hub, configured for 5\/16-24 hardware with an included 5\/16-18 pinch bolt. Black anodized for a tough, corrosion-resistant exterior, it features a 1.25-inch bore for precise axle engagement.\u003cp\u003eThis single-pattern setup locks everything in place, preventing shifts that could cost you time. The lightweight build enhances your kart's agility, making it easier to hit apexes and extend leads.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnodized Protection:\u003c\/strong\u003e Black finish wards off wear from track debris and weather.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eIncluded Components:\u003c\/b\u003e Hardware and pinch bolt for immediate, secure installation.\u003c\/li\u003e\n\u003cli\u003eBalanced Rotation: Promotes even tire wear and consistent handling.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFor better organization, its all-in-one kit reduces parts hunting during builds. Racers benefit from the hub's ability to maintain alignment, leading to predictable behavior in variable conditions.\u003c\/p\u003e\u003cp\u003ePerformance Mfg's engineering ensures it withstands high torques, ideal for tuned engines. SKU: PM-38-5\/16 – your rear hub solution for speed and simplicity.\u003c\/p\u003e\u003cp\u003eIt's the detail that separates contenders from champions.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this hub compatible with all kart axles?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This hub is specifically designed for a 1.25-inch diameter axle. Please verify your axle size before purchasing to ensure a proper, secure fit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this hub come with the necessary hardware for installation?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, this kit includes the 5\/16-24 hardware and the 5\/16-18 pinch bolt, allowing for an immediate and secure installation onto your axle.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why is the black anodized finish important for a rear hub?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The black anodized coating provides a durable, corrosion-resistant barrier that protects the aluminum from track debris, moisture, and environmental wear, ensuring the hub maintains its integrity over time.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does the single-pattern design benefit my racing performance?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The single-pattern setup is engineered to lock the hub firmly in place, preventing unwanted shifting or movement on the axle. This stability helps maintain consistent alignment and handling, which is critical for hitting apexes and maintaining speed.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can this hub handle high-torque engine setups?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Absolutely. Performance Mfg has engineered this hub to withstand high torque loads, making it an excellent choice for tuned engines and competitive racing environments.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/40mm-pmi-rear-wheel-hub-w-dual-patterns-double-lock-style-pm-38dl-40\"\u003e40mm PMI Double Lock Rear Wheel Hub with Dual Patterns for Secure Racing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralight-right-rear-double-lock-hub-5-16-hardware-only-pm-38dl-5-16\"\u003eUltralight Right Rear Double Lock Hub for 5\/16 Inch Hardware Strength\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/metric-pattern-front-hub-with-17mm-bearings-5-16-hardware-only-pm-39f-17m\"\u003eMetric Pattern Front Hub Featuring 17mm Bearings and 5\/16 Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/17mm-front-hub-usa-pattern-5-16-hardware-only-included-pm-39f-17us\"\u003e17mm USA Pattern Front Hub with Included 5\/16\" Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralite-5-8-front-hub-5-16-hardware-only-pm-39-5-16\"\u003eUltraLite 5\/8\" Front Hub with 5\/16\" Hardware and Rubber Sealed Bearings\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Performance Mfg","offers":[{"title":"Default Title","offer_id":52562708365630,"sku":"PM-38-5\/16","price":29.83,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/wheelshubsbyperformancemfg-ultralite-1-25-rear-hub-5-16-hardware-only-pm-38-5-16.jpg?v=1763114642"},{"product_id":"ultralight-right-front-stepped-hub-1-4-hardware-only-pm-39st-1-4","title":"Ultralight Right Front Stepped Hub with 1\/4\" Hardware","description":"Weight savings start here: the PM-39ST-1\/4 Ultralight Right Front Stepped Hub is engineered for minimal mass while delivering maximum utility in kart fronts.\u003cp\u003eAs a right-side specialist, it features a stepped profile that mates with varying spindle diameters, promoting balanced load sharing. The ultralight construction shaves grams off your kart, directly enhancing acceleration and braking without fatigue.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eAccepts only 1\/4\" hardware for secure fit\u003c\/li\u003e\n\u003cli\u003eIdeal for right front oval or road course use\u003c\/li\u003e\n\u003cli\u003eHigh-strength alloy despite featherweight design\u003c\/li\u003e\n\u003cli\u003eStreamlines air flow around the hub area\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThis hub's lightness aids in quicker chassis flex recovery, vital for maintaining momentum through chicanes. It's a go-to for weight-conscious classes, where every ounce impacts qualifying positions.\u003c\/p\u003e\u003cp\u003eWith hardware provided, assembly is a breeze, helping keep your trackside routine organized. The stepped innovation ensures compatibility with stepped axles, avoiding common fitment headaches.\u003c\/p\u003e\u003cp\u003eSKU: PM-39ST-1\/4. Ultralight doesn't mean underbuilt – it's precision for podium pursuits.\u003c\/p\u003e\u003cp\u003eRacers leveraging this hub report feeling the speed boost in straightaways, thanks to reduced rotating weight.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why should I choose an ultralight hub over a standard weight hub?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Reducing rotating mass at the wheel hub directly improves your kart's acceleration and braking performance. In weight-conscious racing classes, shaving these grams can be the difference between qualifying positions and helps the chassis recover more quickly from flex during cornering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this hub compatible with all kart spindles?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This hub features a stepped profile designed to mate with specific stepped spindle diameters. Please verify your spindle dimensions before installation to ensure a proper, secure fit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use 5\/16\" hardware with this hub?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e No, this specific model is precision-engineered to accept only 1\/4\" hardware. Using incorrect hardware sizes can compromise the safety and integrity of your wheel assembly.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this hub suitable for both oval and road course racing?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the PM-39ST-1\/4 is designed to be versatile enough for both oval and road course applications, provided your setup requires a right-front stepped hub configuration.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this hub come with the necessary hardware?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, this product includes the required 1\/4\" hardware, allowing for a quick and organized trackside installation.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultrafree-right-front-stepped-wheel-hub-with-1-4-hardware-pm-39stf-1-4\"\u003ePerformance Mfg UltraFree Right Front Stepped Hub - 1\/4\" Hardware - Racing Spec\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultrafree-left-front-stepped-wheel-hub-with-1-4-hardware-pm-39stfl-1-4\"\u003ePerformance Mfg UltraFree Left Front Stepped Hub - 1\/4\" Hardware - Oval Racing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultrafree-left-front-wheel-hub-with-1-4-hardware-pm-39f-1-4\"\u003eUltraFree Left Front Hub Equipped with 1\/4 Inch Hardware for Karts\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralite-5-8-front-hub-1-4-hardware-only-bullet-tip-studs-pm-39-1-4\"\u003eUltraLite 5\/8\" Front Hub with 1\/4\" Bullet Tip Studs for Precision Kart Handling\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralight-right-rear-double-lock-hub-1-4-hardware-only-pm-38dl-1-4\"\u003eUltralight Right Rear Double Lock Hub Designed for 1\/4 Inch Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Performance Mfg","offers":[{"title":"Default Title","offer_id":52565668102462,"sku":"PM-39ST-1\/4","price":35.81,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/standardwheelhubsfront-ultralight-right-front-stepped-hub-1-4-hardware-only-pm-39st-1-4.jpg?v=1763116315"},{"product_id":"17mm-front-hub-usa-pattern-5-16-hardware-only-included-pm-39f-17us","title":"17mm USA Pattern Front Hub with Included 5\/16\" Hardware","description":"\u003cul\u003e\n\u003cli\u003eUSA bolt pattern for broad compatibility with domestic wheels\u003c\/li\u003e\n\u003cli\u003e17mm bearing size for smooth front axle operation\u003c\/li\u003e\n\u003cli\u003eIncludes essential 5\/16\" hardware for immediate installation\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eStandardize your front wheel assembly with this reliable hub, designed to bolt on effortlessly and deliver consistent results. The PM-39F-17US excels in maintaining wheel alignment, which is key to reducing scrub and extending tire life during aggressive driving.\u003c\/p\u003e\u003cp\u003eKart owners value its no-fuss setup, allowing quick swaps between sessions to adapt to changing track conditions. By securing wheels firmly, it prevents slippage that could lead to lost time or accidents, keeping you in the race.\u003c\/p\u003e\u003cp\u003eThis hub's construction prioritizes lightness and strength, aiding in quicker direction changes without added bulk. It's a staple for teams racing in USA-spec classes, where pattern matching is non-negotiable.\u003c\/p\u003e\u003cp\u003eSKU: PM-39F-17US. Elevate your pit efficiency with hardware included – ready to race right out of the box.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this hub compatible with all kart wheels?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This hub features a standard USA bolt pattern, making it compatible with the vast majority of domestic racing wheels. Please verify your wheel's bolt pattern before installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this hub come ready to install?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the PM-39F-17US includes the necessary 5\/16\" hardware, allowing for a quick and easy swap at the track.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why is the 17mm bearing size important?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The 17mm bearing size is designed for standard front spindles, ensuring smooth rotation and minimal friction, which is essential for maintaining speed through corners.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does this hub help with tire wear?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e By providing a secure, precise fit, this hub helps maintain proper wheel alignment. Consistent alignment reduces unnecessary tire scrub, helping you get more life out of your racing tires.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this for both sprint and oval racing?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, this hub is designed for durability and performance in various USA-spec karting classes, providing the strength needed for aggressive direction changes in both sprint and oval configurations.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/metric-pattern-front-hub-with-17mm-bearings-5-16-hardware-only-pm-39f-17m\"\u003eMetric Pattern Front Hub Featuring 17mm Bearings and 5\/16 Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralite-5-8-front-hub-5-16-hardware-only-pm-39-5-16\"\u003eUltraLite 5\/8\" Front Hub with 5\/16\" Hardware and Rubber Sealed Bearings\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultrafree-left-front-stepped-wheel-hub-with-1-4-hardware-pm-39stfl-1-4\"\u003ePerformance Mfg UltraFree Left Front Stepped Hub - 1\/4\" Hardware - Oval Racing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralight-right-front-stepped-hub-5-16-hardware-only-pm-39st-5-16\"\u003eUltralight Right Front Stepped Hub with 5\/16\" Hardware and Bearings\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/metric-pattern-front-hub-with-5-8-bearings-5-16-hardware-only-pm-39f-58m\"\u003ePerformance Mfg Metric Front Hub - 5\/8\" Bearings \u0026amp; 5\/16\" Hardware - All Classes\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Performance Mfg","offers":[{"title":"Default Title","offer_id":52565858287934,"sku":"PM-39F-17US","price":42.78,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/standardwheelhubsfront-17mm-front-hub-usa-pattern-5-16-hardware-only-included-pm-39f-17us.jpg?v=1763116372"},{"product_id":"ultralight-right-front-stepped-hub-5-16-hardware-only-pm-39st-5-16","title":"Ultralight Right Front Stepped Hub with 5\/16\" Hardware and Bearings","description":"\u003cp\u003ePush the envelope of lightness with the PM-39ST-5\/16 Ultralight Right Front Stepped Hub, boasting 3\/4\" inner and 5\/8\" outer bearings for oval excellence.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eExclusively for 5\/16\" hardware compatibility\u003c\/li\u003e\n\u003cli\u003eIncludes standard studs and serrated nuts\u003c\/li\u003e\n\u003cli\u003eStepped design for precise spindle mating\u003c\/li\u003e\n\u003cli\u003eUltralight build to optimize kart dynamics\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFocused on the right front, this hub reduces inertia for snappier steering corrections, especially beneficial in high-banked turns where weight matters. The bearing combo handles inner stresses while keeping outer rotation fluid, preventing power loss.\u003c\/p\u003e\u003cp\u003eFor teams, its included components simplify inventory management at the track, ensuring you're always prepared for tweaks. The ultralight nature amplifies engine output, turning more RPMs into forward thrust.\u003c\/p\u003e\u003cp\u003eThis hub empowers aggressive lines without penalty, a secret weapon for series contenders. SKU: PM-39ST-5\/16.\u003c\/p\u003e\u003cp\u003eEmbrace the featherweight advantage – it's engineered to make your kart feel alive under throttle.\u003c\/p\u003e\u003cp\u003eIn testing, similar hubs have helped shave setup times, letting drivers concentrate on perfecting their craft.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What are the specific bearing sizes for this hub?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The PM-39ST-5\/16 features a 3\/4\" inner bearing and a 5\/8\" outer bearing, specifically engineered for optimal performance in oval racing applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this hub compatible with 1\/4\" wheel studs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e No, this specific model is designed exclusively for 5\/16\" hardware. Please ensure your wheel setup matches this hardware size before installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why is the stepped design important for my kart?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The stepped design ensures precise mating with your spindle, which helps maintain consistent alignment and reduces vibration, leading to more predictable steering corrections.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this hub come with the necessary hardware?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, this hub includes standard studs and serrated nuts, making it a complete, ready-to-install solution for your right front corner.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does an ultralight hub improve kart performance?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e By reducing unsprung weight and rotational inertia, this hub allows for snappier steering response and helps the engine reach higher RPMs more efficiently, providing a competitive edge in high-banked turns.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultrafree-left-front-stepped-wheel-hub-with-1-4-hardware-pm-39stfl-1-4\"\u003ePerformance Mfg UltraFree Left Front Stepped Hub - 1\/4\" Hardware - Oval Racing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/metric-pattern-front-hub-with-5-8-bearings-5-16-hardware-only-pm-39f-58m\"\u003ePerformance Mfg Metric Front Hub - 5\/8\" Bearings \u0026amp; 5\/16\" Hardware - All Classes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralite-5-8-front-hub-5-16-hardware-only-pm-39-5-16\"\u003eUltraLite 5\/8\" Front Hub with 5\/16\" Hardware and Rubber Sealed Bearings\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ultralight-right-rear-double-lock-hub-5-16-hardware-only-pm-38dl-5-16\"\u003eUltralight Right Rear Double Lock Hub for 5\/16 Inch Hardware Strength\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/metric-pattern-front-hub-with-17mm-bearings-5-16-hardware-only-pm-39f-17m\"\u003eMetric Pattern Front Hub Featuring 17mm Bearings and 5\/16 Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Performance Mfg","offers":[{"title":"Default Title","offer_id":52566473900350,"sku":"PM-39ST-5\/16","price":35.81,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/standardwheelhubsfront-ultralight-right-front-stepped-hub-5-16-hardware-only-pm-39st-5-16.jpg?v=1763116566"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/collections\/standardwheelhubsfront-17mm-front-hub-usa-pattern-5-16-hardware-only-included-pm-39f-17us_a5407d32-ca08-4156-bdf0-df5d75d902f1.jpg?v=1789002393","url":"https:\/\/swiftkarting.com\/collections\/performance-mfg-pmi-kart-wheel-hubs.oembed","provider":"Swift Karting","version":"1.0","type":"link"}