{"product_id":"driven-racing-428-evo-tech-rear-sprocket-honda-grom","title":"Driven Racing 428 EVO TECH Rear Sprocket | Honda Grom","description":"\u003cp\u003eFine-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. Important — bolt pattern changed in 2022: 2014–2021 Grom \/ Monkey 125: use 34T, 35T, or 36T 2022+ Grom \/ Monkey 125: use 38T, 39T, or 40T Chain size: #428 Inner diameter: 58mm Diagonal bolt spacing: 89mm Material: case-hardened steel Made in USA by Driven Racing Also fits (428 chain): Honda CR 80R (1985), CT 70 (1969–1994), XL 80S (1980–1986), XR 70R (1997–1999), ZB 50 (1988) Gearing guide: Stock rear sprocket: 34T (2021 and earlier Grom) \/ 38T (2022+ Grom) Adding rear teeth — more low-end torque and acceleration, better for urban riding and short straights Removing rear teeth — higher top-end speed, lower RPMs, better for open road and long straights Removing 1 front tooth ˜ adding 3 rear teeth California Prop 65 Warning: www.p65warnings.ca.gov\u003c\/p\u003e","brand":"driven racing usa","offers":[{"title":"Default Title","offer_id":48045348192443,"sku":"169-542   34T","price":35.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0719\/1340\/6651\/files\/667477.jpg?v=1783058533","url":"https:\/\/thriftyscooters.com\/products\/driven-racing-428-evo-tech-rear-sprocket-honda-grom","provider":"Thrifty Scooters","version":"1.0","type":"link"}