Driven Racing 428 EVO TECH Rear Sprocket | Honda Grom
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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. 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
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