{"title":"Metric Axle Bearings","description":"\u003cp\u003eMetric axle bearings are rolling-element bearings sized to metric kart axle diameters (commonly 25 mm, 30 mm, 40 mm, and 50 mm) so the axle can rotate in the bearing carrier or hubs with low friction. Free-spin versions are used where the axle must turn independently of a hub or carrier rather than drive it.\u003c\/p\u003e","products":[{"product_id":"50mm-small-diameter-axle-bearing-km680","title":"High-Performance 50mm Small Diameter Axle Bearing for Metric Karts","description":"\u003cp\u003eEngineered for precision in every rotation, this 50mm small diameter axle bearing transforms how your kart handles high-speed corners and straightaways. Compatible with 80mm ID axle cassettes, it slides into place effortlessly, providing a seamless fit that minimizes vibrations and maximizes power transfer from your engine to the wheels.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eSeamless Compatibility:\u003c\/b\u003e Perfectly sized for standard metric axle setups, ensuring no play or wobble during intense races.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced Friction:\u003c\/strong\u003e The small 50mm diameter design cuts down on rotational resistance, allowing your kart to accelerate quicker and maintain higher speeds without unnecessary energy loss.\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eDurable Construction:\u003c\/em\u003e Built to withstand the rigors of kart racing, from dusty tracks to wet conditions, keeping your driveline smooth and responsive lap after lap.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eImagine shaving seconds off your lap times just by upgrading this critical component. Racers often overlook bearings, but this one, frequently called the 50x80 axle bearing, is a game-changer for organization at the pit—easy to install and maintain, so you spend less time wrenching and more time winning. Whether you're tuning for a local sprint or a national championship, it supports better weight distribution and stability, helping you navigate turns with confidence. For kart setups demanding reliability, integrate the \u003cb\u003eKM680\u003c\/b\u003e SKU into your build today and feel the difference in every push on the throttle.\u003c\/p\u003e\u003cp\u003eIts robust build resists wear from constant torque, ensuring longevity that keeps your kart competitive season after season. Pair it with other metric components for an optimized driveline that feels like an extension of your driving style, promoting faster overall times through superior mechanical efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this bearing compatible with all 50mm kart axles?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This bearing is specifically designed for 50mm axles that utilize an 80mm ID axle cassette. Please verify your cassette size before installation to ensure a proper, wobble-free fit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace my axle 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 grinding, excessive play, or resistance when spinning the axle by hand, it is time to replace them to maintain peak performance and prevent driveline failure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this bearing require special lubrication?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e These bearings come pre-lubricated for racing conditions. To extend their lifespan, keep them clean and free of debris. If you race in wet or dusty conditions, ensure your axle seals are in good condition to protect the internal grease.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this bearing for both sprint and endurance racing?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the KM680 is engineered for durability and is suitable for both sprint and endurance applications. Its robust construction is designed to handle the constant torque and high-speed demands of competitive karting.\u003c\/p\u003e","brand":"Kart Manufacturing","offers":[{"title":"Default Title","offer_id":52562258723134,"sku":"KM680","price":24.85,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/metricaxlebearings-50mm-small-diameter-axle-bearing-km680_5c51b217-c6f3-421c-b862-422e47be207e.jpg?v=1763116475"},{"product_id":"50mm-axle-bearing-fsb50","title":"Durable 50mm Metric Axle Bearing for Kart Driveline Stability","description":"\u003cp\u003eStruggling with axle wobble that throws off your line through tight corners? The solution lies in upgrading to a bearing that prioritizes stability and speed. This 50mm Axle Bearing, with its generous 90mm outer diameter, fits flawlessly into metric axle systems, providing the solid foundation your kart needs to handle aggressive driving without compromise.\u003c\/p\u003e\u003cp\u003eEngineered for the demands of kart racing, it excels in reducing rotational resistance, which means more of your engine's power reaches the track surface. Racers often see enhanced traction and quicker response times, crucial for overtaking maneuvers or defending positions. Its robust construction shrugs off the abuse from high-RPM sessions, ensuring longevity even in dusty or wet conditions.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSeamless Compatibility: Designed specifically for 50mm axles common in intermediate and advanced karts.\u003c\/li\u003e\n\u003cli\u003eOptimal Sizing: The 90mm OD allows for straightforward mounting without modifications to your existing hubs or frames.\u003c\/li\u003e\n\u003cli\u003ePerformance Boost: Lowers heat buildup during extended runs, preserving axle alignment for precise steering and braking.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eImagine gliding through straights with effortless efficiency, your kart feeling lighter and more responsive. This bearing transforms potential weak points in your driveline into strengths, helping you maintain momentum where others falter. For teams focused on drive-line components, it's an indispensable piece that ties together chassis and power delivery.\u003c\/p\u003e\u003cp\u003eEasy to install during routine maintenance, it requires no special tools—just a direct swap for outdated units. Kart owners praise its quiet operation and vibration dampening, which contribute to a smoother ride and less fatigue over long race days. Secure yours today as the 50mm Axle Bearing (SKU: FSB50) and experience how small upgrades lead to big gains in track dominance. Whether tweaking for local leagues or national events, this component keeps your setup race-ready.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I know if this 50mm 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 standard 50mm kart axles. Please verify that your current axle diameter is exactly 50mm and that your bearing housing accepts a 90mm outer diameter (OD) bearing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I need special tools to install this axle bearing?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e No special tools are required. This is a direct-fit replacement for standard 50mm metric axle bearings. Ensure your axle is clean and free of debris before sliding the new bearing into place to prevent binding.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace my kart axle bearings?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Bearing life depends on track conditions and maintenance. If you notice increased rotational resistance, audible grinding, or excessive play (wobble) in the rear axle, it is time to replace them to maintain optimal driveline efficiency.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can this bearing be used in wet or dusty racing conditions?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, this bearing is engineered with robust construction to withstand the rigors of high-RPM sessions, including exposure to dust and moisture, provided it is properly maintained and kept lubricated.\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\/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":52562259738942,"sku":"FSB50","price":19.87,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/metricaxlebearings-50mm-axle-bearing-fsb50_6f7740c3-8781-43f7-a614-ef000d79da88.jpg?v=1763116292"},{"product_id":"25mm-axle-bearing-fsb25","title":"Reliable 25mm Axle Bearing for Kid Kart Excellence","description":"\u003cp\u003eStruggling with sluggish starts in your kid kart? This 25mm axle bearing addresses that head-on by providing ultra-low resistance for snappier acceleration right out of the gate.\u003c\/p\u003e\u003cp\u003eSpecifically suited for the compact world of youth racing, where every ounce of efficiency counts, this bearing ensures the axle rotates with minimal drag. Its metric 25mm bore aligns flawlessly with kid kart specifications, preventing misalignment issues that can rob precious speed from young drivers.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e \u003cem\u003eYouth-Focused Design:\u003c\/em\u003e Optimized for lighter loads and smaller frames, yet tough enough for repeated track sessions.\u003c\/li\u003e\n\u003cli\u003e \u003cstrong\u003eEnhanced Safety:\u003c\/strong\u003e Stable operation reduces unexpected vibrations, giving parents peace of mind during high-stakes events.\u003c\/li\u003e\n\u003cli\u003e \u003cu\u003eEasy Maintenance:\u003c\/u\u003e Simple installation means more time racing and less time wrenching, ideal for busy karting families.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003ePicture your junior racer confidently navigating tight corners without the hindrance of axle bind – that's the edge this bearing delivers. By streamlining power transfer from engine to wheels, it indirectly boosts overall kart responsiveness, helping kids build confidence and lap records early. Don't overlook these small parts; they make big differences in developing future champions. SKU: FSB25 – equip your kid kart for victory.\u003c\/p\u003e","brand":"Swift Karting","offers":[{"title":"Default Title","offer_id":52562260001086,"sku":"FSB25","price":14.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/metricaxlebearings-25mm-axle-bearing-fsb25_bf0631e5-069e-414d-a949-116b91ee11de.jpg?v=1763116633"},{"product_id":"30mm-axle-bearing-fsb30","title":"Precision 30mm Axle Bearing for Smooth Kart Performance","description":"\u003cp\u003eEngineered for the demands of high-speed kart racing, the FSB30 30mm axle bearing delivers unmatched reliability where it counts most. With a precise 30mm inner diameter and 62mm outer diameter, this metric axle bearing fits seamlessly into your kart's drive-line components, ensuring smooth rotation and reduced drag that translates to quicker lap times.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlush Design Advantage:\u003c\/strong\u003e One side features a flush mount for easy installation without protruding edges, minimizing wind resistance and potential snag points during intense races.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecure Shoulder Setup:\u003c\/strong\u003e The opposite side includes a shoulder reinforced with setscrews, locking the bearing firmly in place to withstand the vibrations and stresses of aggressive cornering and straight-line sprints.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerformance Boost:\u003c\/strong\u003e By minimizing friction between the axle and housing, this bearing helps maintain consistent power delivery from your engine, allowing your kart to shave seconds off your best times.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIn the heat of competition, every component must perform flawlessly. The FSB30 excels in axle bearings category, supporting your kart's chassis to handle higher speeds without compromise. Whether you're a weekend warrior or a pro racer, integrating this bearing into your setup means better organization of drivetrain parts and fewer mid-race adjustments. SKU: FSB30 – the go-to choice for racers seeking durability and speed in metric axle bearings.\u003c\/p\u003e\u003cp\u003eImagine gliding through turns with effortless control, your kart responding instantly to throttle inputs. That's the edge this bearing provides, making it essential for any serious kart enthusiast looking to optimize track performance and stay ahead of the pack.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I know if the FSB30 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 a standard 30mm axle. Please verify that your kart's rear axle diameter is exactly 30mm before purchasing. The 62mm outer diameter is a standard metric size that fits most common kart bearing hangers.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Which side of the bearing should face outward?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The flush side should face outward to minimize wind resistance and prevent snagging. The side with the shoulder and setscrews should face inward toward the axle housing to allow you to lock the bearing securely in place.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace my axle bearings?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Axle bearings should be inspected regularly for signs of play, grinding, or resistance. If you notice any \"notchiness\" when rotating the axle by hand or if there is visible movement in the bearing housing, it is time to replace them to maintain optimal track performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I need to lubricate these bearings before installation?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e These bearings come pre-lubricated for high-speed racing demands. Ensure your axle is clean and free of debris or burrs before sliding the bearing on to prevent damage to the inner race.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the purpose of the setscrews on the shoulder?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The setscrews are critical for locking the bearing to the axle. This prevents the axle from shifting laterally during aggressive cornering, ensuring your kart maintains consistent handling and power delivery.\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\/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\/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-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\u003c\/ul\u003e","brand":"Performance Mfg","offers":[{"title":"Default Title","offer_id":52562260099390,"sku":"FSB30","price":13.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/metricaxlebearings-30mm-axle-bearing-fsb30_8b50a376-3c5b-4f59-b05b-537648350af2.jpg?v=1763116674"},{"product_id":"40mm-free-spin-axle-bearing-fsb40","title":"High-Performance 40mm Free Spin Axle Bearing for Margay Ignite K3","description":"\u003cstrong\u003eUnlock smoother, faster rotations\u003c\/strong\u003e on your kart with the 40mm Free Spin Axle Bearing, a precision component designed to minimize resistance in high-speed applications. As the original equipment manufacturer choice for the Margay Ignite K3 chassis, this bearing excels in demanding race environments where every ounce of efficiency counts.\u003cp\u003eKey dimensions include a race outer diameter of 80mm, ensuring a perfect match for standard axle housings, while the 21mm race width and 50mm overall width provide balanced support without compromising agility. Marked \u003ci\u003eUC208KZZ\u003c\/i\u003e, it features advanced shielding to keep contaminants out, preserving low-friction performance lap after lap.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFree-spin technology allows the bearing to rotate with minimal torque loss, directly improving acceleration and top-end speed on straightaways.\u003c\/li\u003e\n\u003cli\u003eBuilt to handle the vibrations and loads of kart racing, it reduces wear on connected driveline parts like axles and hubs.\u003c\/li\u003e\n\u003cli\u003eOEM compatibility means hassle-free integration into Margay setups, but its versatility suits other metric axle systems too.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eImagine pushing harder into turns without the drag of inferior bearings— this upgrade helps by maintaining axle alignment and heat dissipation, leading to more consistent race times and fewer pit stops. For teams focused on driveline optimization, it's an essential piece that enhances overall vehicle responsiveness. SKU: \u003cstrong\u003eFSB40\u003c\/strong\u003e. Regular inspection and this bearing's robust build ensure longevity, making it a smart investment for serious competitors.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this bearing compatible with karts other than the Margay Ignite K3?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, while it is the OEM choice for the Margay Ignite K3, this 40mm bearing is designed to fit standard metric axle housings, making it a versatile upgrade for many other karting chassis using a 40mm axle system.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What does the \"Free Spin\" technology actually do for my lap times?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Free-spin technology reduces internal rotational resistance. By minimizing torque loss, your engine doesn't have to work as hard to turn the axle, which can lead to improved acceleration out of corners and higher top-end speeds on straightaways.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How often should I inspect or replace my axle bearings?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e You should inspect your bearings before every race weekend. Check for any \"grittiness\" or play when rotating the axle by hand. If you notice increased drag, vibration, or if the bearing feels loose in the housing, it is time to replace it to prevent driveline damage.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this bearing in wet or dusty track conditions?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the UC208KZZ features advanced shielding specifically designed to keep dirt, dust, and moisture out of the internal races, helping to maintain low-friction performance even in demanding track environments.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What are the critical dimensions I should verify before installation?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Ensure your axle housing accepts an 80mm outer diameter bearing. This unit has a 21mm race width and a 50mm overall width, which provides a stable, balanced fit for standard 40mm kart axles.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cp\u003eNone of the provided candidate products are directly related to axle or drivetrain components, as they are limited to bumper mounting, steering geometry, and throttle linkage. Therefore, no related products are listed.\u003c\/p\u003e","brand":"Margay Racing","offers":[{"title":"Default Title","offer_id":52562263114046,"sku":"FSB40","price":12.86,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/metricaxlebearings-40mm-free-spin-axle-bearing-fsb40_b9f6c613-2e0c-45d5-90f0-e81731859689.jpg?v=1763117128"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/collections\/metricaxlebearings-40mm-free-spin-axle-bearing-fsb40_4ecc8a12-f047-4109-bfe7-3923cec51851.jpg?v=1788980256","url":"https:\/\/swiftkarting.com\/collections\/metric-kart-axle-bearings-25mm-50mm-karting-parts.oembed","provider":"Swift Karting","version":"1.0","type":"link"}