{"title":"Spindle (Kingpin) Bearings","description":"\u003cp\u003eSpindle (kingpin) bearings sit in the front caster block and support the kingpin, the vertical steering pivot. They are commonly specified by inner diameter (1\/2 in, 3\/8 in, 7\/16 in) and height, including 0.375 in and thinner 0.3125 in versions.\u003c\/p\u003e","products":[{"product_id":"kingpin-washer-kit-1-2-id-pm-99kwk-12","title":"Performance Manufacturing 1\/2\" ID Kingpin Washer Kit - 7\/8\" OD - Universal Sprint Chassis","description":"\u003cp\u003eDialing in the front-end geometry of your racing kart requires absolute precision, and eliminating spindle play is the first step to securing pole position. When you are pushing the limits of your chassis, even a fraction of a millimeter of slop in the kingpin assembly translates to unpredictable steering feedback and scrubbed speed through the apex. This Performance Manufacturing 1\/2\" ID Kingpin Washer Kit provides the exact shimming tolerances needed to lock down your front end, ensuring that every steering input is directly transferred to the track surface.\u003c\/p\u003e\u003ch2\u003eMaximize Chassis Efficiency and Briggs and Stratton LO206 Horsepower\u003c\/h2\u003e\u003cp\u003ePower delivery isn't just about tuning your go kart clutch or optimizing a belt drive system; it's about maintaining momentum. If your spindles are shifting under load, you are bleeding valuable speed. By utilizing this comprehensive 38-piece shim kit, you can perfectly align your kingpin bearings, reducing rolling resistance. This means you can maximize every ounce of your briggs and stratton lo206 horsepower, carrying higher exit speeds without fighting a wandering front end.\u003c\/p\u003e\u003ch2\u003ePrecision Shimming for Go Kart Wheels Tires and Alignment\u003c\/h2\u003e\u003cp\u003eProper caster and camber settings are useless if the spindle assembly shifts during high-G cornering. Whether you are running high-grip sprint compounds or standard go kart wheels tires, this kit allows you to fine-tune the vertical play on 1\/2\" kingpin bolts. The combination of 1\/16\" and 1\/32\" washers gives mechanics the micro-adjustment capabilities required for professional trackside tuning. Track conditions change rapidly, and having the right hardware on hand is critical for any serious competitor. This kit is a staple for any go karts supply box, ensuring you are never caught off guard during practice or qualifying sessions. Proper spindle shimming also extends the lifespan of your kingpin bearings by preventing uneven load distribution, saving you from costly mid-season rebuilds and keeping your kart on the track where it belongs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\/2\" Inner Diameter:\u003c\/strong\u003e Precision-stamped to fit standard 1\/2\" kingpin bolts with zero radial slop.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e7\/8\" Outer Diameter:\u003c\/strong\u003e Provides optimal surface area contact for kingpin bearings and spindle yokes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e36 Heavy-Duty 1\/16\" Washers:\u003c\/strong\u003e Forms the robust foundation for major gap bridging and structural support.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2 Micro-Adjustment 1\/32\" Washers:\u003c\/strong\u003e Allows for ultra-fine tuning to eliminate the final thousandths of an inch of vertical play.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Chassis Kit:\u003c\/strong\u003e Includes enough hardware to fully shim and rebuild both left and right spindle assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFriction Reduction:\u003c\/strong\u003e Prevents binding in the steering yoke, ensuring smooth, predictable steering inputs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Compatibility:\u003c\/strong\u003e Engineered for seamless integration with modern sprint, oval, and enduro racing chassis.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I know if I need to shim my kingpins?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e If you notice vertical play or \"slop\" when grabbing the top and bottom of your front tires, your kingpin assembly likely needs shimming. Eliminating this play is essential for precise steering feedback and preventing the spindle from shifting under high-G cornering loads.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I determine the correct number of washers to use?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Start by removing all existing shims and seating the spindle fully. Add 1\/16\" washers until the gap is nearly closed, then use the 1\/32\" micro-adjustment washers to achieve a snug fit that allows the spindle to rotate freely without binding. The goal is zero vertical movement while maintaining smooth steering action.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use these washers on any kart chassis?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, this kit is designed for universal compatibility with standard 1\/2\" kingpin bolts found on most modern sprint, oval, and enduro racing chassis.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why is it important to use different thicknesses of washers?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The 1\/16\" washers are ideal for bridging larger gaps quickly, while the 1\/32\" washers allow for the fine-tuning required to eliminate the final thousandths of an inch of play, ensuring your front-end geometry remains consistent throughout the race.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this kit cover both sides of the kart?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, this 38-piece kit contains enough hardware to fully shim and rebuild both the left and right spindle assemblies on your racing kart.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/pm-120047-steering-post-assembly-8-5-straight-pm-120047\"\u003e8.5\" Straight Steering Post Assembly for Kart Stability\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/pm-115a26-slack-steering-shaft-26-pm-115a26\"\u003ePerformance Manufacturing Slack 26\" Steering Shaft - Threaded End - Go Kart Racing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/spindle-shaft-right-front-straight-pm-89a\"\u003ePerformance Manufacturing PM-89A Straight Right Front Spindle Shaft - 5\/8\" OD x 4.75\" - Universal Kart Chassis\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/spindle-shaft-right-front-stepped-pm-89b\"\u003eStepped Right Front Spindle Shaft for Oval and Sprint Karts\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/spindle-shaft-left-front-short-pm-89c\"\u003ePerformance Manufacturing PM-89C Short Left Front Spindle Shaft - 5\/8\" OD - Oval Kart Racing\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Performance Manufacturing","offers":[{"title":"Default Title","offer_id":52562260427070,"sku":"PM-99KWK-12","price":11.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/spindlekingpinbearings-kingpin-washer-kit-1-2-id-pm-99kwk-12_2876145b-0cd9-46a8-8ded-8c481f1e4e92.jpg?v=1763116615"},{"product_id":"1-2-lower-caster-block-bearing-12lsb","title":"Margay Ignite \u0026 Brava Sprint 1\/2\" Lower Caster Block Bearing - 1\" OD - Kart Steering","description":"\u003cp\u003eDialing in the front-end geometry of high-performance go karts requires zero-slop precision, and the Margay 1\/2\" Lower Caster Block Bearing delivers exactly that by eliminating steering bind at the spindle. When you are pushing the limits and trying to maximize your briggs and stratton lo206 horsepower, every ounce of friction reduction matters. This high-performance spherical bearing acts as the critical pivot point for your caster block or lower steering shaft, ensuring fluid, predictable turn-in on tight sprint tracks. Built specifically for the rigors of competitive racing, it provides the structural integrity needed to handle aggressive curb strikes and high-G cornering without deforming.\u003c\/p\u003e\u003ch2\u003ePrecision Steering \u0026amp; Motor Cart Integration\u003c\/h2\u003e\u003cp\u003eWhether you are wrenching on a dedicated Margay Ignite, a Brava Sprint chassis, or a custom motor cart build, maintaining precise caster alignment is non-negotiable. A worn lower steering bearing introduces unwanted play, causing erratic handling and scrub that kills your momentum. By upgrading to this 1\/2\" ID by 1\" OD bearing, you lock down your steering column's lower pivot. This translates directly to sharper steering response and quicker recovery out of the apex. While most racers focus heavily on upgrading engine components or installing aero-efficient chain guards, neglecting your steering pivot points will leave lap time on the table.\u003c\/p\u003e\u003ch2\u003eTrack-Tested Durability for Margay Chassis\u003c\/h2\u003e\u003cp\u003eThis bearing isn't just a generic replacement; it is a vital component for keeping your pit area organized and your chassis performing at its peak. The .390\" race thickness provides a robust housing that resists the intense lateral loads generated by modern racing tires. It allows for fine caster adjustments, giving you the confidence to navigate complex track sectors. As a staple in any serious racer's toolbox, this bearing ensures your steering system operates with the same high-level precision as the rest of your kart's drivetrain.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Dimensions:\u003c\/strong\u003e Features a precise .500\" inner diameter and 1.0\" outer diameter for a snug, slop-free fit in standard caster blocks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-Duty Race Thickness:\u003c\/strong\u003e The .390\" race thickness withstands aggressive track demands and heavy lateral cornering loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMargay Chassis Compatibility:\u003c\/strong\u003e Proven as a direct-fit lower steering bearing for popular Margay Ignite and Brava Sprint setups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFriction Reduction:\u003c\/strong\u003e Delivers ultra-smooth pivot action to reduce steering effort and prevent mid-corner binding.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced Caster Alignment:\u003c\/strong\u003e Provides the rigid support necessary for accurate, repeatable caster and camber adjustments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile Application:\u003c\/strong\u003e Ideal for both dedicated sprint racing chassis and custom yard or motor cart fabrication projects.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Built from high-grade steel to resist wear, ensuring long-lasting performance race after race.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I know if my lower caster block bearing needs to be replaced?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e If you notice \"slop\" or play in your steering column, or if the steering feels binding or notchy when turning the wheel, your bearing is likely worn. Any movement in the lower pivot point can cause erratic handling and inconsistent turn-in.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this bearing compatible with all Margay chassis?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This bearing is specifically designed for the Margay Ignite and Brava Sprint chassis. It features a 1\/2\" ID and 1\" OD, making it a direct-fit replacement for the standard caster blocks on these models.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the benefit of the .390\" race thickness?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The increased race thickness provides superior structural integrity compared to standard thin-walled bearings. This allows the bearing to withstand the high lateral G-forces and aggressive curb strikes common in competitive sprint karting without deforming.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I need special tools to install this bearing?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e While it can be installed with standard shop tools, we recommend using a bearing press or a properly sized driver to ensure the bearing is seated squarely in the caster block. Avoid hammering directly on the inner race to prevent damage.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ignite-spindle-right-hand-mg466538\"\u003eRight Hand Billet 17mm Spindle for Margay Ignite Chassis\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ignite-spindle-left-hand-mg465538\"\u003eLeft Hand Billet 17mm Spindle for Margay Ignite Kart\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ignite-caster-pill-half-black-mg094589\"\u003eHalf Black Caster Pill for Margay Ignite Fine-Tuning\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/k3-king-pin-mg041314\"\u003ek3-king-pin-mg041314\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/k3-king-pin-castle-nut-38cn\"\u003e3\/8-24 AN Castle Nut for K3 King Pin Security\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Margay","offers":[{"title":"Default Title","offer_id":52562261442878,"sku":"12LSB","price":5.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/spindlekingpinbearings-1-2-lower-caster-block-bearing-12lsb_7d70de45-d7fc-4fde-9ca5-d1e69c161e86.jpg?v=1763116520"},{"product_id":"1-2-spindle-bearing-thin-3125-height-12sb-ss","title":"Slim 1\/2\" Spindle Bearing for Precision Kart Steering - .3125\" Height","description":"\u003cp\u003eEngineered for kart racers demanding razor-sharp steering, this slim 1\/2\" spindle bearing stands out with its .3125\" height, offering a sleeker profile than standard models.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact Design:\u003c\/strong\u003e At just .3125\" thick, it integrates seamlessly into tight setups for optimized weight distribution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Fit:\u003c\/strong\u003e Serves as a direct replacement for PRC spindles and various other brands, simplifying maintenance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSealed Protection:\u003c\/strong\u003e Rubber seals keep out dirt and moisture, ensuring longevity during intense races.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Dimensions:\u003c\/strong\u003e 1.125\" outer diameter matches common kart specifications for easy installation.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eBy minimizing play in your kingpin assembly, it delivers smoother turns and quicker response times, helping you navigate tracks with confidence and gain that competitive edge. SKU: 12SB-SS.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why should I choose a .3125\" height spindle bearing over a standard size?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The slim .3125\" profile is designed for racers looking to optimize weight distribution and fitment in tight kingpin assemblies where space is at a premium. It provides the same structural support as thicker bearings while maintaining a lower profile.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this bearing compatible with my current kart chassis?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This bearing features a 1.125\" outer diameter, which is a standard specification for many racing karts. It is a direct replacement for PRC spindles and is compatible with a wide range of other brands using this common sizing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do the rubber seals benefit my steering performance?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The integrated rubber seals are critical for keeping dirt, track debris, and moisture out of the bearing race. By preventing contamination, these seals ensure the bearing continues to rotate smoothly, minimizing play in your steering assembly and maintaining consistent response times.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I need special tools to install this spindle bearing?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Installation is straightforward for most kart mechanics. Ensure your spindle shaft is clean and free of burrs before sliding the bearing into place. Using a proper bearing driver or a socket that matches the outer race diameter will help prevent damage during installation.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\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\/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\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":"Swift Karting","offers":[{"title":"Default Title","offer_id":52562261672254,"sku":"12SB-SS","price":3.93,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/spindlekingpinbearings-1-2-spindle-bearing-thin-3125-height-12sb-ss_b0ffc563-73d4-417d-b04b-5a15049abbba.jpg?v=1763116243"},{"product_id":"7-16-spindle-bearing-small-od-716sbsm","title":"Compact 7\/16\" Spindle Bearing Small OD for Early Shadow Karts","description":"\u003cp\u003eStruggling with outdated spindle components causing sloppy steering in your classic kart? This compact 7\/16\" spindle bearing with small OD solves that by providing a snug fit and superior load distribution.\u003c\/p\u003e\u003cp\u003eKey advantages include:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eA \u003cb\u003e0.90625\" (29\/32\") outer diameter\u003c\/b\u003e specifically designed for early Shadow Karts and similar models, preventing wobble during aggressive maneuvers.\u003c\/li\u003e\n\u003cli\u003eTwo removable rubber seals (marked 1607-2RS) that shield internals from track debris while allowing easy cleaning and inspection.\u003c\/li\u003e\n\u003cli\u003eHigh-precision construction that lowers rolling resistance, translating to quicker response times and enhanced grip on varied surfaces.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSKU: 716SBSM integrates seamlessly into your setup, helping maintain alignment under high G-forces and ultimately cutting lap times through refined control. Ideal for both restoration projects and ongoing race prep.\u003c\/p\u003e","brand":"Shadow Kart","offers":[{"title":"Default Title","offer_id":52562261737790,"sku":"716SBSM","price":3.93,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/spindlekingpinbearings-7-16-spindle-bearing-small-od-716sbsm_e8549def-1927-4719-ab45-deaad3c04d03.jpg?v=1763116162"},{"product_id":"km306-metric-8mm-king-pin-bearing-km306","title":"Precision Metric 8mm King Pin Bearing for Smooth Kart Steering","description":"\u003cp\u003eDiscover the edge in kart handling with this essential component built for precision. The \u003cstrong\u003eMetric 8mm King Pin Bearing\u003c\/strong\u003e features an 8mm inner diameter, 22mm outer diameter, and 7mm height, perfectly suited for Euro kart metric applications.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMinimizes spindle friction to enable quicker, more accurate steering responses during races.\u003c\/li\u003e\n\u003cli\u003eEnhances overall vehicle stability, helping you maintain control through tight corners and straightaways.\u003c\/li\u003e\n\u003cli\u003eConstructed for durability, it withstands the rigors of track abuse without compromising smoothness.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eWhether you're tuning for speed or reliability, integrating the \u003cb\u003eSKU: KM306\u003c\/b\u003e into your setup translates to fewer adjustments and more focus on winning. Racers trust this bearing to keep their kingpin assembly operating at peak efficiency, directly boosting lap times and competitive edge.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I know if this 8mm bearing is compatible with my kart?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This bearing is designed for metric king pin assemblies. Please verify that your king pin bolt diameter is exactly 8mm and that your spindle housing accepts a 22mm outer diameter bearing. If your spindle requires a larger bolt, you may need the 10mm version.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace my king pin bearings?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e We recommend inspecting your bearings before every race weekend. If you notice any \"notchiness,\" play, or resistance when turning the spindle by hand, it is time to replace them to ensure smooth steering input.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do these bearings require lubrication?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e While these bearings are built for durability, applying a light, high-quality synthetic grease or dry lubricant can help displace moisture and debris, further extending the life of the bearing under harsh track conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this bearing on both sides of the kart?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the KM306 is a universal fit for both the left and right side spindles, provided your kart uses a standard 8mm metric king pin setup.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/km308-metric-10mm-king-pin-bearing-22mm-od-km308\"\u003eDurable Metric 10mm King Pin Bearing with 22mm OD for Kart Upgrades\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KM Performance","offers":[{"title":"Default Title","offer_id":52562261934398,"sku":"KM306","price":2.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/spindlekingpinbearings-km306-metric-8mm-king-pin-bearing-km306_26d959b8-2567-4b99-ac4c-556514c58ef6.jpg?v=1763116411"},{"product_id":"km308-metric-10mm-king-pin-bearing-22mm-od-km308","title":"Durable Metric 10mm King Pin Bearing with 22mm OD for Kart Upgrades","description":"\u003cp\u003eStruggling with imprecise steering that costs you precious seconds? Solve it by upgrading to this compact powerhouse. The \u003cstrong\u003eMetric 10mm King Pin Bearing 22mm OD\u003c\/strong\u003e measures 10mm inner diameter, 22mm outer diameter, and 6mm height, ideal for demanding track environments.\u003c\/p\u003e\u003cp\u003eKey advantages include:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSuperior load-bearing capacity that stabilizes your kart's front end for confident high-speed maneuvers.\u003c\/li\u003e\n\u003cli\u003eLow-friction design reduces energy loss, allowing more power to propel you forward efficiently.\u003c\/li\u003e\n\u003cli\u003eEasy installation in metric kingpin systems, getting you back on the track faster with organized, hassle-free maintenance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFor those serious about kart racing, the \u003cb\u003eSKU: KM308\u003c\/b\u003e ensures your setup remains agile and responsive, turning potential handling issues into opportunities for speed gains and podium finishes.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I know if this 10mm king pin bearing is compatible with my kart?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This bearing is designed for metric kingpin systems. Please measure your existing kingpin diameter to ensure it is exactly 10mm and verify that your spindle housing accepts a 22mm outer diameter bearing with a 6mm height.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Should I grease these bearings before installation?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, applying a high-quality, kart-specific synthetic grease before installation is recommended to ensure smooth operation and to protect the internal components from track debris and moisture.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace my king pin bearings?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e You should inspect your bearings for play or \"notchiness\" before every race weekend. If you notice any steering slop or resistance, it is time to replace them to maintain precise handling and steering response.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this bearing if my kart uses 8mm hardware?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e No, this bearing is specifically sized for 10mm kingpins. If your kart requires 8mm hardware, please use the KM306 Metric 8mm King Pin Bearing instead.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/km306-metric-8mm-king-pin-bearing-km306\"\u003ePrecision Metric 8mm King Pin Bearing for Smooth Kart Steering\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KM Performance","offers":[{"title":"Default Title","offer_id":52562261967166,"sku":"KM308","price":2.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/spindlekingpinbearings-km308-metric-10mm-king-pin-bearing-22mm-od-km308_ad5cf8e2-fdc6-4954-b2fe-f42f043f7f0b.jpg?v=1763116329"},{"product_id":"km314-metric-10mm-king-pin-bearing-26mm-od-typical-otk-km314","title":"Precision Metric 10mm King Pin Bearing with 26mm OD for OTK Spindles","description":"\u003cp\u003eEngineered for seamless integration in OTK spindles, this metric king pin bearing delivers unmatched reliability on the track. With precise dimensions of 10mm inner diameter, 26mm outer diameter, and 8mm height, it supports effortless wheel rotation while cutting down on vibrations that can throw off your lap times.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuperior Durability:\u003c\/strong\u003e Built to withstand intense racing pressures, ensuring your kart's front-end stays aligned for sharper cornering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eEasy Fitment:\u003c\/em\u003e Tailored for OTK chassis, making installation straightforward without specialized tools.\u003c\/li\u003e\n\u003cli\u003eBoosts Speed: By minimizing friction, it helps you shave seconds off your race pace through smoother steering response.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eWhether you're tweaking your setup for a weekend race or fine-tuning for nationals, the KM314 bearing (SKU: KM314) is your go-to for professional-grade performance in Euro metric kart systems.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I know if my OTK king pin bearing needs to be replaced?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e You should inspect your king pin bearings if you notice \"play\" or movement in the front spindles, or if the steering feels notchy or stiff. Any signs of rust, grit, or resistance when rotating the spindle indicate that the bearing has worn out and should be replaced to maintain precise handling.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this bearing compatible with all OTK chassis models?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the KM314 is the standard metric king pin bearing used across the vast majority of OTK chassis (Tony Kart, Kosmic, Exprit, FA Kart, etc.) that utilize a 10mm king pin bolt. Always verify your current spindle setup to ensure it matches the 10mm ID and 26mm OD specifications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I need special tools to install the KM314 bearing?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e No specialized tools are required. Because these are designed for a straightforward fit, you can typically remove the old bearing and press the new one into the spindle housing by hand or with a light tap from a rubber mallet. Ensure the spindle housing is clean and free of debris before installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Should I grease these bearings before installing them?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e While these bearings come pre-lubricated, applying a light coat of high-quality karting grease can help protect against moisture and debris, especially if you race in damp conditions. Avoid over-greasing, as this can attract dirt.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/uniball-10mm-ub1010\"\u003eOTK Tony Kart Steering Shaft Uniball Joint - 10mm x 26mm - All Classes\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KM Performance","offers":[{"title":"Default Title","offer_id":52562261999934,"sku":"KM314","price":2.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/spindlekingpinbearings-km314-metric-10mm-king-pin-bearing-26mm-od-typical-otk-km314_dedd3002-5bf4-4037-a7db-9c7c4fbf48ed.jpg?v=1763116240"},{"product_id":"7-16-spindle-bearing-716sb","title":"Precision 7\/16\" Spindle Bearing with Rubber Seals for Smooth Kart Handling","description":"\u003cp\u003eEngineered for kart racers who demand unwavering precision, this 7\/16\" spindle bearing delivers exceptional smoothness in wheel rotation, directly contributing to tighter cornering and faster overall lap times.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRubber-sealed design\u003c\/strong\u003e protects against dirt and moisture, extending bearing life under intense track conditions.\u003c\/li\u003e\n\u003cli\u003e1.125\" outer diameter aligns perfectly with 12SB specifications, ensuring easy drop-in replacement without modifications.\u003c\/li\u003e\n\u003cli\u003eConstructed from high-grade materials to minimize vibration and heat buildup, allowing consistent power delivery from your engine.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eWhether you're tweaking your chassis setup or performing routine maintenance, integrating SKU: 716SB into your kart's kingpin system boosts handling responsiveness, giving you the edge in every race. Racers report noticeable improvements in straight-line stability and reduced wear on adjacent components.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I know if this 7\/16\" spindle bearing is compatible with my kart?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This bearing is designed for 7\/16\" kingpins and features a 1.125\" outer diameter. It is a direct drop-in replacement for standard 12SB specifications. Always verify your current spindle diameter and housing size before installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why are rubber seals important for a kart spindle bearing?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Karting environments are often dusty and wet. The rubber-sealed design prevents dirt, debris, and moisture from entering the bearing race, which significantly extends the life of the component and maintains smooth rotation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace my spindle bearings?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e It is recommended to inspect your bearings during routine chassis maintenance. If you notice any \"notchiness,\" play in the wheel, or increased vibration, it is time to replace them to ensure optimal handling and steering responsiveness.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this bearing on both the left and right spindles?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, this is a universal 7\/16\" spindle bearing suitable for both sides of your kart's front end, provided your spindles utilize the 1.125\" outer diameter housing.\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\/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\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":"Swift Karting","offers":[{"title":"Default Title","offer_id":52562262163774,"sku":"716SB","price":2.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/spindlekingpinbearings-7-16-spindle-bearing-716sb_b4781b92-df0b-45b3-ad1b-e51ae9035c2b.jpg?v=1763116505"},{"product_id":"1-2-spindle-bearing-375-height-12sb","title":"Durable 1\/2\" Spindle Bearing for Robust Kart Performance - .375\" Height","description":"\u003cp\u003eWhy settle for less when your kart's steering demands unyielding support? This 1\/2\" spindle bearing, boasting a .375\" height, exceeds thinner variants in robustness for demanding track conditions.\u003c\/p\u003e\u003cp\u003eKey advantages include its thicker build that absorbs shocks better, leading to steadier control and fewer adjustments mid-race. As a reliable swap for PMI-SLACK spindles and others, it features rubber sealing to shield against track debris, prolonging component life.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEnhanced Thickness: .375\" for added durability without excess weight.\u003c\/li\u003e\n\u003cli\u003eProven Compatibility: Fits multiple spindle types effortlessly.\u003c\/li\u003e\n\u003cli\u003eStandard 1.125\" OD: Ensures precise, hassle-free mounting.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eExperience the difference in your kart's responsiveness—tighter lines through turns mean faster overall times and a real shot at podium finishes. SKU: 12SB.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why choose a .375\" height spindle bearing over thinner alternatives?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The .375\" height provides a thicker, more robust profile that better absorbs track vibrations and impacts. This added durability helps maintain consistent steering geometry and responsiveness, which is critical for hitting tight lines and improving lap times.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this bearing compatible with my current kart setup?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This bearing features a standard 1.125\" outer diameter and is designed as a reliable, direct swap for PMI-SLACK spindles and various other common spindle types. Its universal sizing ensures a precise, hassle-free fit for most standard racing karts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does the rubber sealing benefit my kart's performance?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The integrated rubber seals act as a barrier against track debris, dust, and moisture. By keeping contaminants out of the internal race, the seals significantly prolong the life of the bearing and ensure smooth, consistent steering movement throughout the race season.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I need special tools to install this spindle bearing?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Installation is straightforward for anyone familiar with basic kart maintenance. Ensure your spindle shaft is clean and free of burrs before sliding the bearing into place. A light application of high-quality bearing grease is recommended to ensure optimal performance and longevity.\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-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\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":52562262294846,"sku":"12SB","price":1.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/spindlekingpinbearings-1-2-spindle-bearing-375-height-12sb_c74863c7-aff8-448c-886c-55d2b8e82d42.jpg?v=1763116295"},{"product_id":"3-8-spindle-bearing-38sb","title":"Generic 38SB 3\/8\" Spindle Bearing - .375\" ID x .875\" OD - All Classes","description":"\u003cp\u003eEliminating sloppy steering and maintaining razor-sharp control on the track requires high-quality \u003cstrong\u003ecart parts\u003c\/strong\u003e from trusted \u003cstrong\u003ego kart stores\u003c\/strong\u003e, and the 3\/8\" spindle bearing (SKU: 38SB) delivers exactly that. Designed with a precise .375\" inner diameter and .875\" outer diameter, this bearing provides a snug, slop-free fit for standard kart spindles and steering assemblies. By minimizing lateral movement and significantly reducing steering friction, drivers can navigate tight apexes with absolute confidence, ensuring that every ounce of momentum is carried through the corner. When you are pushing the limits of grip, having a reliable kingpin bearing translates directly to lower lap times and improved driver feedback.\u003c\/p\u003e\n\n\u003ch2\u003ePrecision Engineering for Motor Cart Applications\u003c\/h2\u003e\n\u003cp\u003eWhether you are fine-tuning a Margay Ignite chassis or upgrading a custom \u003cstrong\u003emotor cart\u003c\/strong\u003e, the 38SB spindle bearing ensures your steering geometry remains perfectly aligned under heavy lateral loads. Precision machining reduces mechanical drag, which is absolutely crucial when you are trying to maximize your \u003cstrong\u003eBriggs and Stratton LO206 horsepower\u003c\/strong\u003e. Less friction in the steering assembly means less energy wasted on mechanical binding, allowing you to focus entirely on your racing line, braking points, and smooth throttle application. Every fraction of a horsepower counts in spec class racing, and a free-spinning spindle is a competitive advantage.\u003c\/p\u003e\n\n\u003ch2\u003eDurable Cart Parts for Competitive Racing\u003c\/h2\u003e\n\u003cp\u003eDurability is non-negotiable in competitive karting. Just as you rely on premium \u003cstrong\u003ecarburetor rebuilding kits\u003c\/strong\u003e and high-engagement \u003cstrong\u003ebully clutches\u003c\/strong\u003e to keep your powertrain running flawlessly, your chassis demands bearings that can withstand the harsh vibrations and violent impacts of wheel-to-wheel racing. This spindle bearing is manufactured from high-grade hardened steel to resist premature wear and tear. By preventing the kingpin from wallowing out the spindle bore, it extends the lifespan of your steering components and keeps your front-end setup dialed in heat after heat, weekend after weekend.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExact Fitment:\u003c\/strong\u003e Precision .375\" ID and .875\" OD dimensions for standard kart spindles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFriction Reduction:\u003c\/strong\u003e Minimizes mechanical drag to maintain top-end speed and momentum.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced Durability:\u003c\/strong\u003e Hardened steel construction built to withstand heavy lateral cornering loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlop Elimination:\u003c\/strong\u003e Cures loose steering for razor-sharp track precision and driver feedback.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Compatibility:\u003c\/strong\u003e Seamlessly fits Margay, Ignite, and a wide variety of custom chassis.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtended Component Life:\u003c\/strong\u003e Reduces metal-on-metal wear on kingpins and steering yokes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I know if my spindle bearings need to be replaced?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e You should inspect your spindle bearings if you notice \"slop\" or play in your steering, uneven tire wear, or if the steering feels stiff or notchy when turning the wheels by hand. Any lateral movement in the kingpin indicates the bearing is worn and should be replaced to maintain handling precision.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Are these bearings compatible with all kart chassis?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The 38SB is designed for standard kart spindles requiring a .375\" ID and .875\" OD. It is a universal fit for many popular chassis, including Margay and Ignite models, but we recommend measuring your existing spindle bore and kingpin diameter to ensure a perfect fit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I need to grease these bearings during installation?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, applying a light coat of high-quality synthetic grease during installation helps reduce friction and protects the hardened steel from moisture and corrosion, ensuring a longer service life under racing conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use these for both sprint and oval racing?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Absolutely. Whether you are navigating tight road course apexes or high-speed oval corners, these bearings are built to handle the heavy lateral loads and vibrations associated with all forms of competitive karting.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8mmtr275b-black-8mm-hex-tie-rod-only-8mmtr275b\"\u003eHigh-Performance Black 8mm Hex Tie Rod Tube 275mm\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8mmtr270b-black-8mm-hex-tie-rod-only-8mmtr270b\"\u003eRobust Black 8mm Hex Tie Rod - 270mm for Enhanced Steering\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/euro-snap-clamp-set-jk2999\"\u003eAffordable Euro Snap Clamp Set Pair - CIK Alternative to KG Brand - Bumper Clamps BodyWork Front\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Swift Karting","offers":[{"title":"Default Title","offer_id":52562262425918,"sku":"38SB","price":1.38,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/spindlekingpinbearings-3-8-spindle-bearing-38sb_41ab2519-4edd-4f11-b54b-d34680875ec5.jpg?v=1763116427"},{"product_id":"3-8-quarter-midget-spindle-bearing-qm38sb","title":"Precision 3\/8\" Quarter Midget Spindle Bearing with COM-6 Spherical Insert","description":"\u003cp\u003eEngineered for the demands of quarter midget racing, this 3\/8\" spindle bearing integrates a robust COM-6 spherical bearing to deliver unmatched smoothness in steering mechanisms. Young drivers can count on it to cut down on vibrations and friction, translating directly to sharper turns and quicker acceleration out of corners.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eKey Dimensions:\u003c\/strong\u003e 3\/8\" inner diameter tailored for quarter midget spindles\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpherical Design:\u003c\/strong\u003e COM-6 insert allows self-alignment, preventing binding during high-speed maneuvers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Excellence:\u003c\/strong\u003e High-grade steel construction resists corrosion and heat from prolonged track sessions\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eBy optimizing spindle rotation, this bearing helps shave seconds off lap times, giving racers an edge in tight competitions. It's a must-have for maintenance kits, ensuring your kart's front-end geometry stays true race after race. SKU: QM38SB – stock up for season-long reliability and focus on what matters: crossing the finish line first.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why is a spherical bearing like the COM-6 insert important for quarter midget spindles?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The COM-6 spherical insert allows for self-alignment. In high-speed racing, chassis flex can cause binding in standard rigid bearings; this design compensates for that movement, ensuring your steering remains smooth and responsive throughout the entire cornering arc.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I know if my spindle bearing needs to be replaced?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e You should inspect your spindle bearings regularly for any signs of play, \"notchy\" movement, or grinding noises. If you notice increased steering friction or if the front-end geometry feels inconsistent during track sessions, it is time to replace the bearing to maintain optimal handling.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this 3\/8\" spindle bearing compatible with all kart chassis?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This bearing is specifically engineered for 3\/8\" spindle shafts common in quarter midget racing. Please verify your spindle diameter before purchase to ensure a proper fit, as improper sizing can lead to steering slop or safety issues.\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\/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-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\/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":52562263048510,"sku":"QM38SB","price":5.85,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/spindlekingpinbearings-3-8-quarter-midget-spindle-bearing-qm38sb_a95f05b3-77ed-44d8-a136-47d4f6b16bc9.jpg?v=1763116150"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/collections\/spindlekingpinbearings-1-2-lower-caster-block-bearing-12lsb_7d70de45-d7fc-4fde-9ca5-d1e69c161e86.jpg?v=1788973180","url":"https:\/\/swiftkarting.com\/collections\/kart-spindle-kingpin-bearings-caster-block.oembed","provider":"Swift Karting","version":"1.0","type":"link"}