{"product_id":"electro-co-etm-rtr-xl-420-chain-63t-sprocket","title":"Electro \u0026 Co ETM RTR 420 Chain 63T Rear Sprocket","description":"\u003cp\u003eThe ETM RTR 63T Rear Sprocket is a direct OEM replacement sprocket for the ETM RTR 420 chain drivetrain. It maintains factory gearing for smooth, predictable power delivery across everyday riding and routine maintenance. The correct tooth count and chain compatibility mean no drivetrain modifications required.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFitment:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eETM RTR XL\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNOTE\u003c\/strong\u003e: This will work on \u003cstrong\u003eSport and Lite\u003c\/strong\u003e models using the Alpha motor and 420 chain system. You will need a different length chain from stock.\u003c\/p\u003e\n\u003cp\u003eRear sprockets wear down over time as they mesh with the chain under load. This 63-tooth replacement restores proper chain engagement, reduces unnecessary drivetrain wear, and brings back efficient power transfer to the rear wheel. Matching the original tooth count preserves the bike's intended gearing characteristics, keeping acceleration, throttle response, and overall ride feel consistent with factory spec. Whether you're replacing a damaged sprocket or performing scheduled drivetrain maintenance, this part delivers the correct fit without guesswork.\u003c\/p\u003e","brand":"Electro \u0026 Co","offers":[{"title":"Default Title","offer_id":49908508229861,"sku":"ETMRTRXL63TS","price":44.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0511\/3964\/1496\/files\/Photoroom_20260427_112925_1.jpg?v=1782703422","url":"https:\/\/gritshift.com\/de\/products\/electro-co-etm-rtr-xl-420-chain-63t-sprocket","provider":"GritShift","version":"1.0","type":"link"}