{"product_id":"driven-racing-428-rear-sprocket-for-honda-grom-and-monkey-125-169-547","title":"Driven Racing 428 EVO TECH Rear Sprocket | Honda Grom","description":"Fine-tune your Honda Grom or Monkey 125's gearing with the Driven Racing EVO TECH #428 rear sprocket. CNC-machined and case-hardened in the USA for maximum durability and smooth power delivery. Available in 34T–40T to optimize for acceleration or top-end speed.\u003cstrong\u003eImportant — bolt pattern changed in 2022:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2014–2021 Grom \/ Monkey 125:\u003c\/strong\u003e use 34T, 35T, or 36T\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2022+ Grom \/ Monkey 125:\u003c\/strong\u003e use 38T, 39T, or 40T\u003c\/li\u003e\n\u003c\/ul\u003e\u003cul\u003e\n\u003cli\u003eChain size: #428\u003c\/li\u003e\n\u003cli\u003eInner diameter: 58mm\u003c\/li\u003e\n\u003cli\u003eDiagonal bolt spacing: 89mm\u003c\/li\u003e\n\u003cli\u003eMaterial: case-hardened steel\u003c\/li\u003e\n\u003cli\u003eMade in USA by Driven Racing\u003c\/li\u003e\n\u003c\/ul\u003e\u003cstrong\u003eAlso fits (428 chain):\u003c\/strong\u003e Honda CR 80R (1985), CT 70 (1969–1994), XL 80S (1980–1986), XR 70R (1997–1999), ZB 50 (1988)\u003cstrong\u003eGearing guide:\u003c\/strong\u003e\u003cul\u003e\n\u003cli\u003eStock rear sprocket: 34T (2021 and earlier Grom) \/ 38T (2022+ Grom)\u003c\/li\u003e\n\u003cli\u003eAdding rear teeth — more low-end torque and acceleration, better for urban riding and short straights\u003c\/li\u003e\n\u003cli\u003eRemoving rear teeth — higher top-end speed, lower RPMs, better for open road and long straights\u003c\/li\u003e\n\u003cli\u003eRemoving 1 front tooth ˜ adding 3 rear teeth\u003c\/li\u003e\n\u003c\/ul\u003e\u003ca href=\"http:\/\/www.p65warnings.ca.gov\"\u003eCalifornia Prop 65 Warning: www.p65warnings.ca.gov\u003c\/a\u003e","brand":"Driven Racing USA","offers":[{"title":"Default Title","offer_id":48112348627131,"sku":"169-542   34T","price":35.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0719\/1340\/6651\/files\/667477_17cab301-5570-44fc-b69e-b87f1f52c255.jpg?v=1784312461","url":"https:\/\/thriftyscooters.com\/products\/driven-racing-428-rear-sprocket-for-honda-grom-and-monkey-125-169-547","provider":"Thrifty Scooters","version":"1.0","type":"link"}