Driven Racing USA
Driven Racing 428 EVO TECH Rear Sprocket | Honda Grom
SKU 169-542 34T
$35.00
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Shipping calculated at checkout.
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.
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
Technical Specifications
- 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)
- Honda CT 70 (1969–1994)
- Honda XL 80S (1980–1986)
- Honda XR 70R (1997–1999)
- Honda 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
Product Diagrams
Features
Specifications
Chain: #428 | Inner Diameter: 58mm | Bolt Spacing: 89mm (diagonal) | Material: Case-Hardened Steel | Options: 34T / 35T / 36T / 38T / 39T / 40T | Origin: USA | SKU: 169-542
Model Fitments
Honda Grom 125 (2014-2021: 34/35/36T | 2022+: 38/39/40T) | Honda Monkey 125 (2014-2021: 34/35/36T | 2022+: 38/39/40T) | Honda CR 80R (1985) | Honda CT 70 (1969-1994) | Honda XL 80S (1980-1986) | Honda XR 70R (1997-1999) | Honda ZB 50 (1988)
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Same day shipping for orders placed before 2PM (CST) M-F
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30-day return period on eligible items
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Flat-rate shipping for orders shipped to the 48 Contiguous United States.
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