{"product_id":"ntn-r12-2rs-3-4-hub-bearing-1-625-od-oval-kart-jackshaft","title":"NTN R12-2RS 3\/4\" Hub Bearing - 1.625\" OD - Oval Kart \u0026 Jackshaft","description":"\u003cp\u003eMinimizing rolling resistance and maximizing power transfer requires the highest quality \u003cstrong\u003ego kart components\u003c\/strong\u003e, and the NTN R12-2RS 3\/4\" Hub Bearing delivers exactly that for competitive oval racers. Whether you are rebuilding a Buller Drive jackshaft or optimizing the backside of an extended right-front hub on a stepped spindle, this 3\/4\" ID by 1.625\" OD bearing ensures zero-slop rotation. Oval karting places immense lateral loads on wheel assemblies, making bearing integrity a critical factor in maintaining corner speed. The dual rubber seals (RS) lock out dirt, track grit, and moisture, ensuring your setup remains frictionless heat after heat.\u003c\/p\u003e\u003ch2\u003eIntegrating with Kart Racing Engines and Drivetrains\u003c\/h2\u003e\u003cp\u003eA high-performance bearing doesn't just keep the wheels turning; it directly impacts how efficiently power from \u003cstrong\u003ekart racing engines\u003c\/strong\u003e reaches the ground. When used as a jackshaft bearing in a Buller Drive tube, the R12-2RS specification handles high RPMs without generating excessive heat or vibration. This ensures that your clutch and chain alignment remains true, preventing premature wear on your \u003cstrong\u003ebelts parts\u003c\/strong\u003e and drive system. Every fraction of a horsepower matters, and eliminating drivetrain drag is the easiest way to find extra speed on the straights.\u003c\/p\u003e\u003ch2\u003eChassis Setup and Shop Tires Optimization\u003c\/h2\u003e\u003cp\u003eYour suspension and chassis geometry are only as good as the bearings supporting them. If you're currently browsing for a \u003cstrong\u003ego kart frame for sale\u003c\/strong\u003e or tuning your existing chassis, upgrading your hub bearings is a mandatory step for structural rigidity. A failing bearing will cause wheel flutter, which destroys tire contact patches and ruins your handling predictability. Before you mount and balance new rubber from your \u003cstrong\u003eshop tires\u003c\/strong\u003e inventory, ensure your hubs are packed with these precision NTN bearings to guarantee absolute concentricity. A stable hub means a stable tire, allowing you to push deeper into the braking zones and carry more momentum through the apex.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Dimensions:\u003c\/strong\u003e 3\/4\" Inner Diameter x 1.625\" Outer Diameter perfectly fits extended right-front oval kart hubs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual Rubber Seals (2RS):\u003c\/strong\u003e Keeps out aggressive track debris, dust, and moisture for extended operational life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuller Drive Compatible:\u003c\/strong\u003e Serves as an exact replacement jackshaft bearing for Buller Drive tubes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow Friction Retainer:\u003c\/strong\u003e Engineered to reduce rolling resistance, translating more horsepower directly to the track.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Radial Load Capacity:\u003c\/strong\u003e Withstands the extreme lateral forces generated during high-speed oval cornering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStepped Spindle Ready:\u003c\/strong\u003e Designed specifically for the backside of extended hubs utilizing stepped size spindles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eABEC-Rated Precision:\u003c\/strong\u003e Manufactured to strict tolerances to eliminate wheel wobble and vibration.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SwiftKarting","offers":[{"title":"Default Title","offer_id":52379682963775,"sku":"34HB","price":3.31,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0968\/6843\/4239\/files\/wheelhubbearings-34hb-3-4-hub-bearing-34hb_b52e3b91-3e44-496f-b124-c5c90313a4d6.jpg?v=1773222786","url":"https:\/\/metro-merch-3.myshopify.com\/products\/ntn-r12-2rs-3-4-hub-bearing-1-625-od-oval-kart-jackshaft","provider":"Metro Merch","version":"1.0","type":"link"}