{"product_id":"m-part-bicycle-cartridge-bearing-mr215317-21-5x31x7-abec-3-hub-replacement","title":"M Part Bicycle Cartridge Bearing MR215317 21.5x31x7 ABEC-3 Hub Replacement","description":"\u003cp\u003eThe M Part Cartridge Bearing MR215317 21,5x31x7 is designed specifically for bicycles, ensuring reliable performance and durability. Crafted with steel retainers and CrMo races, it offers high-quality construction that matches the original bearings used by top bike brands. Its ABEC-3 tolerance guarantees smooth rotation, while the Multemp SRL (Kyodo Yushi) grease ensures long-lasting lubrication.\u003c\/p\u003e\n\n\u003cp\u003eThis cartridge bearing is an essential component for maintaining hub efficiency and wheel performance, making it a trusted choice for cyclists seeking dependable spares and accessories.\u003c\/p\u003e\n\n\u003ch3\u003eWhat It’s Good For\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eReplacing worn or damaged bicycle hub bearings\u003c\/li\u003e\n  \u003cli\u003eMaintaining smooth wheel rotation and overall bike performance\u003c\/li\u003e\n  \u003cli\u003eEnsuring durability with high-quality CrMo components\u003c\/li\u003e\n  \u003cli\u003eCompatibility with a wide range of bicycle hubs and wheels\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat It’s NOT Good For\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eUse in non-bicycle applications requiring different bearing specifications\u003c\/li\u003e\n  \u003cli\u003eHeavy-duty industrial machinery with higher load demands\u003c\/li\u003e\n  \u003cli\u003eApplications needing higher precision than ABEC-3 tolerance\u003c\/li\u003e\n  \u003cli\u003eSituations where alternative grease types are required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs this bearing compatible with all bicycle hubs?\u003c\/strong\u003e\u003cbr\u003eThe MR215317 is designed to fit many standard bicycle hubs but always check your hub specifications to ensure compatibility.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow often should I replace this bearing?\u003c\/strong\u003e\u003cbr\u003eReplacement depends on riding conditions and maintenance, but regular inspections can help determine when a change is needed for optimal performance.\u003c\/p\u003e","brand":"M Part","offers":[{"title":"21.5 x 31 x 7 mm \/ Silver","offer_id":45977527615663,"sku":"CB-138","price":7.17,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0654\/2003\/4223\/files\/cb-138.jpg?v=1768531002","url":"https:\/\/www.swinnertoncycles.co.uk\/products\/m-part-bicycle-cartridge-bearing-mr215317-21-5x31x7-abec-3-hub-replacement","provider":"Swinnerton Cycles","version":"1.0","type":"link"}