{"product_id":"electro-co-etm-rtr-420-chain-55t-rear-sprocket","title":"Electro \u0026 Co ETM RTR 420 Chain 55T Rear Sprocket","description":"\u003cp\u003eThe Electro \u0026amp; Co ETM RTR 420 Chain 55T Rear Sprocket is a direct OEM replacement built for 420 chain drivetrains. It covers routine drivetrain maintenance and worn sprocket swaps across ETM RTR models. Factory tooth count and OEM-spec fitment mean no tuning changes, no guesswork, and clean chain engagement from the first ride.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFitment:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eETM RTR\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis 55-tooth rear sprocket is precision-matched to the ETM RTR's original gearing setup. The factory tooth count keeps acceleration predictable and power delivery consistent, so you're not chasing drivetrain behavior after a maintenance swap. Built to OEM spec, it seats correctly and engages cleanly without requiring any modifications. Whether you're refreshing a high-mileage drivetrain or keeping a spare on hand before a long riding season, this sprocket restores your bike's drivetrain to the way it was designed to run.\u003c\/p\u003e","brand":"Electro \u0026 Co","offers":[{"title":"Default Title","offer_id":49908389052645,"sku":"ETMRTR420S","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0511\/3964\/1496\/files\/Photoroom_20260326_110121__1.jpg?v=1782699486","url":"https:\/\/gritshift.com\/fr\/products\/electro-co-etm-rtr-420-chain-55t-rear-sprocket","provider":"GritShift","version":"1.0","type":"link"}