{"title":"1 1\/4\" Sprocket Hubs","description":"\u003cp\u003e1 1\/4 inch sprocket hubs are rear-axle fittings with a 1.25 in bore that locate and drive the kart sprocket. They transfer chain torque from the sprocket to the axle and are offered in standard, floating, and extra-heavy-duty styles.\u003c\/p\u003e","products":[{"product_id":"1-1-4-floating-sprocket-hub-black-pm-015-fs","title":"Black 1 1\/4 Inch Floating Sprocket Hub PM-015-FS for Adjustable Kart Drive","description":"\u003cp\u003eFine-tune your drivetrain dynamics with the 1 1\/4\" FLOATING Sprocket Hub (Black), SKU PM-015-FS. The floating design permits micro-adjustments to chain tension, adapting to different sprocket sizes and track conditions for peak efficiency.\u003c\/p\u003e\u003cp\u003eThis hub's black finish not only looks sharp but also resists wear from exposure. It mounts easily to axles, providing a stable base that minimizes slippage under load— essential for maintaining speed through variable terrain.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e1 1\/4-inch bore fits standard axles with precision.\u003c\/li\u003e\n\u003cli\u003eFloating mechanism allows play for custom tensioning.\u003c\/li\u003e\n\u003cli\u003eRobust construction handles high-horsepower engines reliably.\u003c\/li\u003e\n\u003cli\u003eCompatible with #35 and #40 chains for broad use.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eRacers leverage this hub to organize gearing choices, swapping sprockets quickly without major overhauls. The adjustability indirectly accelerates your kart by ensuring even chain wrap, reducing drag and boosting torque delivery to the rear wheels. In corners, it contributes to smoother transitions, as consistent tension prevents binding.\u003c\/p\u003e\u003cp\u003eFor endurance events, the floating feature extends component life by absorbing shocks that rigid hubs can't. It's a game-changer for teams chasing lap records, blending versatility with durability. Install one and transform how your kart responds to every throttle input, gaining fractions that add up to victories.\u003c\/p\u003e\u003cp\u003eBeyond the track, its design simplifies maintenance, keeping your pit station efficient and your focus on strategy intact.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the benefit of a \"floating\" sprocket hub compared to a standard fixed hub?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e A floating hub allows for slight movement, which helps maintain optimal chain tension and alignment. This reduces drag, prevents chain binding during cornering, and ensures smoother power delivery to the rear wheels.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this hub compatible with my 1 1\/4\" kart axle?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the PM-015-FS is precision-engineered to fit standard 1 1\/4-inch kart axles, providing a secure, stable base that minimizes slippage under high-horsepower loads.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this hub with different chain sizes?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This hub is designed for broad compatibility and works effectively with both #35 and #40 chains, making it a versatile choice for various racing classes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does the floating design help with maintenance?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The floating mechanism allows you to swap sprockets quickly without major drivetrain overhauls. It also helps extend the life of your chain and sprocket by absorbing shocks that would otherwise stress a rigid mounting system.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/pmi-sprocket-hub-1-25-pm-15\"\u003ePerformance Manufacturing PM-15 1.25\" Sprocket Hub - Black Anodized - All Classes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/1-1-4-sprocket-hub-black-heavy-duty-aph125b-hd\"\u003ePerformance Manufacturing APH125B-HD Heavy Duty Sprocket Hub - 1 1\/4\" Bore Black - Senior Classes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/1-1-4-sprocket-hub-black-new-design-as-of-02-08-2019-aph125b\"\u003ePerformance Manufacturing APH125B 1 1\/4\" Sprocket Hub - Black Billet - All Classes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/pm-77a-light-weight-8-5-sprocket-guard-set-pm-77a\"\u003ePM-77A Lightweight 8.5 Inch Sprocket Guard Set for Kart Efficiency\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/carbon-fiber-spacer-kit-cfsk\"\u003eVersatile Carbon Fiber Spacer Kit for 1.25\" Kart Axles\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Performance Manufacturing","offers":[{"title":"Default Title","offer_id":52562617303358,"sku":"PM-015-FS","price":72.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/114sprockethubs-1-1-4-floating-sprocket-hub-black-pm-015-fs.jpg?v=1763112914"},{"product_id":"1-1-4-sprocket-hub-silver-aph125","title":"Silver 1 1\/4 Inch Sprocket Hub APH125 with Included Hardware","description":"\u003cp\u003eSilver sheen meets functionality in the 1 1\/4\" Sprocket Hub, Silver, SKU APH125. It comes complete with 1\/4-28 fine thread hardware and a 5\/16-18x1.0\" SHCS pinch bolt, ready for immediate use.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSilver aluminum for lightweight strength and cooling.\u003c\/li\u003e\n\u003cli\u003eIncluded hardware simplifies out-of-box installation.\u003c\/li\u003e\n\u003cli\u003ePinch bolt secures axle fit without slippage.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThis hub anchors sprockets solidly, ensuring chains engage fully for maximum torque transfer and rapid acceleration. It aids organization by bundling essentials, cutting setup time in the pits. The fine threads allow nuanced adjustments, fine-tuning tension for specific tracks.\u003c\/p\u003e\u003cp\u003eOn the circuit, its stability shines in high-speed sections, preventing wobbles that sap pace. For versatility, it pairs with various guards and chains, making your kart adaptable across events.\u003c\/p\u003e\u003cp\u003eThe silver finish not only performs but also complements custom builds aesthetically, while the hardware's quality ensures enduring performance.\u003c\/p\u003e","brand":"Apex Performance","offers":[{"title":"Default Title","offer_id":52562623201598,"sku":"APH125","price":46.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/114sprockethubs-1-1-4-sprocket-hub-silver-aph125.jpg?v=1763113056"},{"product_id":"1-1-4-sprocket-hub-black-new-design-as-of-02-08-2019-aph125b","title":"Performance Manufacturing APH125B 1 1\/4\" Sprocket Hub - Black Billet - All Classes","description":"\u003cp\u003eWhen sourcing elite go kart parts for your driveline, the Performance Manufacturing APH125B 1 1\/4\" Sprocket Hub delivers the exact tolerances required to transfer maximum horsepower from your go kart engine directly to the track. In competitive sprint and endurance racing, the driveline is the most critical path for power delivery. Any inefficiency here costs you tenths of a second per lap. This updated billet hub eliminates those inefficiencies, providing a rock-solid foundation for your gearing setup.\u003c\/p\u003e\u003ch2\u003ePrecision Machining for Your Go Kart Engine\u003c\/h2\u003e\u003cp\u003eThe APH125B sprocket hub is engineered from high-grade billet aluminum, providing a rigid mounting foundation that prevents flex under heavy acceleration. A flexing sprocket carrier leads to chain binding, parasitic drag, and lost momentum. By maintaining absolute concentricity, this hub ensures that every ounce of torque generated by your motor engine translates into forward velocity. The refined 2019 design features updated machining tolerances, guaranteeing a slip-free fit on standard 1 1\/4-inch axles.\u003c\/p\u003e\u003ch2\u003eOptimizing the Parts of Wheel and Driveline Assembly\u003c\/h2\u003e\u003cp\u003eDriveline alignment is critical in competitive karting. The APH125B acts as the vital link between your power plant and the rear axle, complementing the other parts of wheel assemblies to maintain rotational balance. Its black anodized finish isn't just for aesthetics; it provides a hardened surface that resists galling and accelerates heat dissipation during long, grueling heat races. When you are dialing in your gear ratios, the precise bolt-circle diameter allows for rapid sprocket changes in the pits, giving your team a distinct mechanical advantage.\u003c\/p\u003e\u003ch2\u003eBuilt for the Demands of Modern Motor Engine Output\u003c\/h2\u003e\u003cp\u003eAs modern karting powerplants produce more aggressive torque curves, your driveline hardware must evolve to handle the stress. The Performance Manufacturing 1 1\/4\" Sprocket Hub is built specifically to withstand the violent engagement of high-performance clutches and the sustained RPMs of elite racing. Whether you are running a high-revving two-stroke or a heavily modified four-stroke setup, this hub guarantees that your chain alignment remains dead-true from the green flag to the checkered. Upgrade your chassis today and experience the difference that true precision engineering makes on the stopwatch.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBillet Aluminum Construction:\u003c\/strong\u003e CNC-machined for zero runout and superior rotational balance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 1\/4-Inch Axle Bore:\u003c\/strong\u003e Exacting tolerances ensure a secure, slip-free fit on standard racing axles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlack Anodized Finish:\u003c\/strong\u003e Enhances heat dissipation and protects against track debris and corrosion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Power Transfer:\u003c\/strong\u003e Reduces driveline flex to maximize output from your go kart engine.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRefined 2019 Design:\u003c\/strong\u003e Updated machining profiles eliminate common wear points and stress risers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRapid Gear Changes:\u003c\/strong\u003e Precision-tapped mounting holes allow for lightning-fast sprocket swaps.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Compatibility:\u003c\/strong\u003e Integrates seamlessly with standard split sprockets and driveline components.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I ensure this hub fits my kart?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The APH125B is specifically engineered for standard 1 1\/4-inch racing axles. Ensure your axle diameter matches this specification before installation to guarantee a secure, slip-free fit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why is a billet aluminum hub better than a standard cast hub?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Billet aluminum offers superior rigidity and tighter machining tolerances. This prevents the hub from flexing under heavy acceleration, which reduces chain binding and ensures more efficient power transfer from your engine to the rear wheels.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How often should I inspect my sprocket hub?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e You should inspect your hub during every routine maintenance interval. Check for any signs of wear on the mounting holes and ensure the set screws or clamping hardware remain tight. The black anodized finish helps resist corrosion, but keeping the hub clean of track debris will extend its lifespan.\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 APH125B is designed for all classes. Its robust construction handles the high-torque demands of both sprint and oval racing environments, providing consistent alignment for your driveline.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this hub come with mounting hardware for the sprocket?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This product is the hub itself. It features precision-tapped holes designed for standard sprocket bolts, allowing for rapid gear changes in the pits.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/1-1-4-floating-sprocket-hub-black-pm-015-fs\"\u003eBlack 1 1\/4 Inch Floating Sprocket Hub PM-015-FS for Adjustable Kart Drive\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/pmi-sprocket-hub-1-25-pm-15\"\u003ePerformance Manufacturing PM-15 1.25\" Sprocket Hub - Black Anodized - All Classes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/1-1-4-sprocket-hub-black-heavy-duty-aph125b-hd\"\u003ePerformance Manufacturing APH125B-HD Heavy Duty Sprocket Hub - 1 1\/4\" Bore Black - Senior Classes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/pm-77a-light-weight-8-5-sprocket-guard-set-pm-77a\"\u003ePM-77A Lightweight 8.5 Inch Sprocket Guard Set for Kart Efficiency\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/carbon-fiber-spacer-kit-cfsk\"\u003eVersatile Carbon Fiber Spacer Kit for 1.25\" Kart Axles\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Performance Manufacturing","offers":[{"title":"Default Title","offer_id":52562625331518,"sku":"APH125B","price":46.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/114sprockethubs-1-1-4-sprocket-hub-black-new-design-as-of-02-08-2019-aph125b.jpg?v=1763113107"},{"product_id":"1-1-4-sprocket-hub-black-heavy-duty-aph125b-hd","title":"Performance Manufacturing APH125B-HD Heavy Duty Sprocket Hub - 1 1\/4\" Bore Black - Senior Classes","description":"\u003cp\u003eEliminate drive-line flex and maximize power transfer to the track with the Performance Manufacturing 1 1\/4\" Heavy Duty Sprocket Hub, a mandatory upgrade when sourcing premium kart parts online. Engineered from billet aluminum and finished in a rugged black anodize, the APH125B-HD sprocket hub is built to clamp down on your 1 1\/4-inch axle with zero slip. Whether you are running a high-horsepower two-stroke or tuning your setup with a fresh lo206 carburetor kit, maintaining perfect chain alignment is critical. This heavy-duty hub utilizes a thick, robust profile that resists deformation, ensuring your sprocket stays true even after aggressive curb strikes or violent standing starts.\u003c\/p\u003e\u003ch2\u003eEssential Drive-Line Upgrades and Carburetor Parts\u003c\/h2\u003e\u003cp\u003eWhile many drivers focus on engine tuning and carburetor parts to find extra tenths, a flexing sprocket hub will rob you of that hard-earned horsepower before it ever reaches the tires. The Performance Manufacturing heavy-duty hub features a standard 6-bolt pattern, making it universally compatible with most performance sprockets and guards. Its extra-wide clamping area provides superior bite on the axle, eliminating the spin-outs and keyway shearing that plague lighter, inferior hubs in senior classes.\u003c\/p\u003e\u003ch2\u003eStop Searching for Parts for Go Karts Near Me\u003c\/h2\u003e\u003cp\u003eYou don't need to waste time looking for parts for go karts near me when you can equip your chassis with race-proven billet components. Maintaining this hub is as straightforward as wiping it down with a quality tire cleaner or degreaser between heats. The black anodized coating not only looks aggressive but provides exceptional corrosion resistance against track debris, harsh chemicals, and moisture.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-Duty Billet Construction:\u003c\/strong\u003e Machined from high-grade aluminum to prevent flexing and chain derailment under heavy loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 1\/4\" Axle Compatibility:\u003c\/strong\u003e Precision-bored to provide a flawless, tight tolerance fit on standard 1.25-inch racing axles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard 6-Bolt Pattern:\u003c\/strong\u003e Easily accepts standard racing sprockets and protective gear guards for quick gearing changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlack Anodized Finish:\u003c\/strong\u003e Delivers superior corrosion resistance and a professional, stealthy aesthetic to your drive-line.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Clamping Force:\u003c\/strong\u003e Extra-thick clamping collar ensures the hub stays locked in place, protecting your keyways.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSenior Class Ready:\u003c\/strong\u003e The go-to choice for high-torque applications, heavy-use fleets, and demanding sprint or oval racing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Power Transfer:\u003c\/strong\u003e Keeps the sprocket perfectly aligned, ensuring every ounce of engine torque reaches the rear wheels.\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 1 1\/4\" kart axles?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the APH125B-HD is precision-bored to fit standard 1 1\/4-inch racing axles. Its heavy-duty clamping collar is designed to provide a secure, slip-free fit on these axles.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why should I choose the \"Heavy Duty\" version over a standard sprocket hub?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The Heavy Duty (HD) version features a thicker, more robust profile designed to resist deformation. This is critical for senior classes or high-horsepower setups where aggressive curb strikes and high-torque standing starts can cause standard hubs to flex or shear keyways.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this hub come with the bolts to attach my sprocket?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This product includes the hub itself. It utilizes a standard 6-bolt pattern, which is compatible with most industry-standard racing sprockets and protective guards you likely already have in your toolbox.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I maintain the black anodized finish?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The anodized coating is highly durable and corrosion-resistant. Simply wipe the hub down with a quality degreaser or tire cleaner between heats to remove track debris and moisture, keeping it looking professional and functioning correctly.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/1-1-4-floating-sprocket-hub-black-pm-015-fs\"\u003eBlack 1 1\/4 Inch Floating Sprocket Hub PM-015-FS for Adjustable Kart Drive\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/pmi-sprocket-hub-1-25-pm-15\"\u003ePerformance Manufacturing PM-15 1.25\" Sprocket Hub - Black Anodized - All Classes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/pm-77a-light-weight-8-5-sprocket-guard-set-pm-77a\"\u003ePM-77A Lightweight 8.5 Inch Sprocket Guard Set for Kart Efficiency\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/acgs-aluminum-chain-guard-w-heat-shield-black-acgs\"\u003eACGS Aluminum Chain Guard \u0026amp; Heat Shield – Fits LO206 \u0026amp; Animal\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/carbon-fiber-spacer-kit-cfsk\"\u003eVersatile Carbon Fiber Spacer Kit for 1.25\" Kart Axles\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Performance Manufacturing","offers":[{"title":"Default Title","offer_id":52562651021630,"sku":"APH125B-HD","price":51.74,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/114sprockethubs-1-1-4-sprocket-hub-black-heavy-duty-aph125b-hd.jpg?v=1763113650"},{"product_id":"pmi-sprocket-hub-1-25-pm-15","title":"Performance Manufacturing PM-15 1.25\" Sprocket Hub - Black Anodized - All Classes","description":"\u003cp\u003eWhen you are sourcing the best performance parts to shave tenths off your lap times, the driveline is where power meets the pavement. The Performance Manufacturing PM-15 1.25\" Sprocket Hub is engineered to eliminate rotational slop and deliver instantaneous power transfer out of the apex. Machined from high-grade billet aluminum and finished with a durable black anodized coating, this clamp-on hub provides a rock-solid foundation for your split sprockets. A rigid driveline ensures that every ounce of torque generated by your engine translates directly to acceleration, preventing the micro-vibrations that cause chain derailments or premature wear.\u003c\/p\u003e\u003ch2\u003eIntegrating with Your Engine Diagram\u003c\/h2\u003e\u003cp\u003eUnderstanding your kart's engine diagram is critical for optimizing gear ratios, and the PM-15 hub makes ratio changes in the pits incredibly efficient. The precision 1.25-inch bore slides seamlessly onto standard performance axles, locking down with exact tolerances to prevent lateral shift under heavy load. Whether you are running a high-horsepower 2-cycle or a torque-heavy 4-cycle, this hub maintains perfect alignment between the clutch and the rear sprocket, ensuring your chain tracks flawlessly at 10,000+ RPM.\u003c\/p\u003e\u003ch2\u003eClearing Space for Brakes and Parts\u003c\/h2\u003e\u003cp\u003eA cluttered rear axle can make maintenance a nightmare. The compact, low-profile footprint of the PMI standard gear hub ensures you have maximum clearance for your inboard brakes and parts. By keeping the rotational mass centralized and the profile slim, you avoid interference with brake rotors, caliper brackets, and bearing cassettes. This streamlined design not only reduces overall unsprung weight but also makes quick-change adjustments during a chaotic race day much easier.\u003c\/p\u003e\u003ch2\u003eKeeping It Clean: Engine Filters and Driveline Synergy\u003c\/h2\u003e\u003cp\u003eJust as high-flow engine filters protect your motor's internals from track dust, a precision-machined sprocket hub protects your driveline from the destructive forces of misalignment. The PM-15 is built to withstand extreme heat cycles and the brutal torque spikes of standing starts, ensuring your setup remains dialed in from the green flag to the checkered.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25-Inch Precision Bore:\u003c\/strong\u003e Matches standard performance axles for a zero-play, slip-free fit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBillet Aluminum Construction:\u003c\/strong\u003e Offers an optimal strength-to-weight ratio to reduce rotational mass.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlack Anodized Finish:\u003c\/strong\u003e Protects against corrosion, track debris, and harsh racing chemicals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Clamp-On Design:\u003c\/strong\u003e Ensures rapid installation and secure clamping force under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVibration Reduction:\u003c\/strong\u003e Minimizes harmonic distortion to keep your chain engaged over aggressive curbs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Compatibility:\u003c\/strong\u003e Works seamlessly with standard split sprockets for quick gearing changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace-Proven Durability:\u003c\/strong\u003e Engineered to survive the rigors of sprint racing and endurance events alike.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will this hub fit my kart's axle?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The PM-15 is designed specifically for standard 1.25-inch performance axles. Please verify your axle diameter before purchasing to ensure a proper, slip-free fit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this hub compatible with all types of sprockets?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, this hub features a universal design that works seamlessly with standard split sprockets, making it an excellent choice for racers who need to perform quick gearing changes in the pits.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I prevent the hub from sliding on the axle?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The PM-15 utilizes a high-strength clamp-on design. Ensure your axle surface is clean and free of debris, then tighten the clamping bolts evenly to the manufacturer's recommended torque specifications to lock the hub securely in place.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does the black anodized finish require special maintenance?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The black anodized coating is highly durable and resistant to corrosion and track chemicals. Simply wipe it down with a clean cloth after racing to remove track debris and keep your driveline looking and performing like new.\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 Absolutely. The PM-15 is engineered for race-proven durability, making it suitable for the rigors of both sprint racing and endurance events, regardless of whether you are running a 2-cycle or 4-cycle engine.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/1-1-4-floating-sprocket-hub-black-pm-015-fs\"\u003eBlack 1 1\/4 Inch Floating Sprocket Hub PM-015-FS for Adjustable Kart Drive\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/1-1-4-sprocket-hub-black-heavy-duty-aph125b-hd\"\u003ePerformance Manufacturing APH125B-HD Heavy Duty Sprocket Hub - 1 1\/4\" Bore Black - Senior Classes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/1-1-4-sprocket-hub-black-new-design-as-of-02-08-2019-aph125b\"\u003ePerformance Manufacturing APH125B 1 1\/4\" Sprocket Hub - Black Billet - All Classes\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/carbon-fiber-spacer-kit-cfsk\"\u003eVersatile Carbon Fiber Spacer Kit for 1.25\" Kart Axles\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/pm-77a-light-weight-8-5-sprocket-guard-set-pm-77a\"\u003ePM-77A Lightweight 8.5 Inch Sprocket Guard Set for Kart Efficiency\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Performance Manufacturing","offers":[{"title":"Default Title","offer_id":52562664653118,"sku":"PM-15","price":66.44,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/114sprockethubs-pmi-sprocket-hub-1-25-pm-15.jpg?v=1763113965"},{"product_id":"arc3602-extra-heavy-duty-1-25-sprocket-hub-arc3602","title":"ARC3602 Extra Heavy Duty 1.25 Inch Sprocket Hub for High HP Karts","description":"\u003cp\u003eFor beasts under the hood, the ARC3602 Extra Heavy Duty 1.25\" Sprocket Hub, SKU ARC3602, stands unmatched. Tailored for high horsepower applications, it also functions as a rotor carrier for 10-inch Jr drag brake rotors, broadening its utility.\u003c\/p\u003e\u003cp\u003eSprocket hardware isn't included— pair with our SGBKF 1\/4-28 fine thread kit for best results. Its massive build tames extreme torque, preventing failures that plague lesser hubs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e1.25-inch design for robust axle compatibility.\u003c\/li\u003e\n\u003cli\u003eExtra heavy duty for tuned engines and drag use.\u003c\/li\u003e\n\u003cli\u003eVersatile as brake component in modified setups.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThis hub channels raw power efficiently, reducing twist under acceleration to keep speeds soaring. It organizes high-performance builds by integrating seamlessly with beefy chains and guards. In drag scenarios, its carrier role ensures braking matches the thrust, stopping on a dime without drama.\u003c\/p\u003e\u003cp\u003eRacers in modified classes gain reliability, as it withstands the punishment of big boosts, leading to more passes and fewer DNFs. The strength indirectly aids speed by maintaining sprocket position through launches.\u003c\/p\u003e\u003cp\u003eWhether hauling down straights or anchoring brakes, it's engineered for the unforgiving side of karting.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is the hardware included with the ARC3602 Sprocket Hub?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e No, sprocket hardware is not included. We recommend pairing this hub with our SGBKF 1\/4-28 fine thread kit for the most secure installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can this hub be used for braking applications?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the ARC3602 is versatile and can function as a rotor carrier for 10-inch Jr drag brake rotors, making it an excellent choice for modified kart setups.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What axle size is this hub designed for?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This hub is specifically engineered for 1.25-inch axles, providing a robust and reliable fit for high-horsepower racing applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why should I choose an \"Extra Heavy Duty\" hub over a standard one?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e High-horsepower and drag-racing karts put immense torque on the drivetrain. This hub is built to resist twisting and mechanical failure, ensuring your sprocket stays aligned during aggressive launches and reducing the risk of a DNF.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/arc6573-arc-billet-clone-stroker-crank-175-stroke-arc6573\"\u003eARC Billet Clone Stroker Crank with +0.175 Inch Stroke for Enhanced Power\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/6272-arc-390-billet-rod-4-410-arc6272\"\u003eARC Racing GX390 Billet Connecting Rod - 4.410\" Length - Modified \/ Outlaw Class\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/arc6689-gx200-honda-clone-billet-flywheel-arc6689-stock-class-arc6689\"\u003eARC Billet Flywheel for GX200 Clone Stock Class Speedway Design\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/arc-6696-billet-predator-flywheel-hemi-only-speedway-design-arc6696\"\u003eARC Billet HEMI Predator Flywheel for Speedway Racing Excellence\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/arc-gx390-rod-insert-arc6391\"\u003eARC Racing GX390 Billet Rod Insert - Big Block Clone Protection - Open Class\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ARC Racing","offers":[{"title":"Default Title","offer_id":52562713346366,"sku":"ARC3602","price":42.78,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/114sprockethubs-arc3602-extra-heavy-duty-1-25-sprocket-hub-arc3602.jpg?v=1763114691"},{"product_id":"arc3600-1-25-lightweight-sprocket-hub","title":"1.25\" Lightweight Sprocket Hub ARC3600 for Kart Axles","description":"\u003cp\u003eThis ARC3600 sprocket hub delivers a strong yet lightweight solution for your kart drivetrain. CNC machined from billet 6061-T6 aluminum, it provides higher strength than typical hubs while staying light enough for stock and plate racing.\u003c\/p\u003e\u003cp\u003eThe 1.25 inch bore pairs with a 5.25 inch bolt circle featuring six 1\/4-28 threads. Compatible with both 35 pitch and 428 pitch chains, it suits SA, outlaw, and open racing styles.\u003c\/p\u003e\u003cp\u003eIncludes the pinch bolt for secure axle mounting. Sprocket mounting hardware is sold separately.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003ch4\u003eWhat is the bore size on this sprocket hub?\u003c\/h4\u003e\u003cp\u003eIt has a 1.25 inch (1-1\/4\") bore.\u003c\/p\u003e\u003ch4\u003eDoes this hub include sprocket mounting bolts?\u003c\/h4\u003e\u003cp\u003eNo, sprocket mounting hardware is not included.\u003c\/p\u003e\u003ch4\u003eWhich chain types does it support?\u003c\/h4\u003e\u003cp\u003eThe hub works with traditional 35 pitch chain or 428 pitch chain.\u003c\/p\u003e\u003ch4\u003eWhat racing classes is this hub suited for?\u003c\/h4\u003e\u003cp\u003eIt performs well in stock, plate, SA, outlaw, and open style kart racing.\u003c\/p\u003e","brand":"ARC","offers":[{"title":"Default Title","offer_id":54335865323838,"sku":"ARC3600","price":34.02,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/ARC3600_Lightweight_1.25__Sprocket_Hub.jpg?v=1787799960"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/collections\/114sprockethubs-1-1-4-floating-sprocket-hub-black-pm-015-fs.jpg?v=1788978322","url":"https:\/\/swiftkarting.com\/collections\/1-1-4-inch-kart-sprocket-hubs-1-25-axle-drive-parts.oembed","provider":"Swift Karting","version":"1.0","type":"link"}