The requested option is unavailable

The option in your link is not available to order. Details below may show a different option. Choose an available option before adding it to your cart.

Choose an available option

Product reference photograph, view 1. Confirm the selected option in the specifications.

Driven Racing 428 EVO TECH Rear Sprocket | Honda Grom

Shop Driven Racing USA

Driven Racing 428 EVO TECH Rear Sprocket | Honda Grom

$38.00

Part number 169-542 34T

Check dimensions and compatibility before ordering.

Same-day dispatch on in-stock orders

Order before 2 PM Central, Monday–Friday. Holidays excluded.

Shipping rates shown at checkout

Available methods and rates depend on your basket and destination.

Request a return within 30 days of ordering

Read the return policy

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

Features

CNC-machined and case-hardened steel — maximum durability and reduced rotating mass
Available in 34T, 35T, 36T, 38T, 39T, 40T for precise gearing tuning
2014–2021 Grom/Monkey: 34T/35T/36T | 2022+ Grom/Monkey: 38T/39T/40T
#428 chain, 58mm inner diameter, 89mm diagonal bolt spacing
Made in USA by Driven Racing

Specifications

Tooth count	34T

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

California Prop 65 Warning: www.p65warnings.ca.gov

Model Fitment

Photo is a product-family reference. Use the selected option and specifications to confirm the exact item; an exact option-specific photograph has not been established.