Honda Grom 428 EVO TECH Rear Sprocket

Driven Racing EVO TECH Rear Sprocket for Honda Grom and Monkey 125

The Driven Racing EVO TECH rear sprocket is built to fit the Honda Grom and Monkey 125, giving riders a way to change their gearing. It is a straightforward option for anyone wanting to alter how their bike accelerates and how fast it goes. Manufactured in the USA, it uses CNC-machined, case-hardened steel. It is one of the Honda scooter parts that can noticeably change how a ride feels.

Build and Longevity

The sprocket is made from case-hardened steel for solid strength. Its CNC-machined construction helps it sit and operate precisely, which supports steady power delivery on the road. Because it is produced in the USA, it is made to a high standard of quality.

Tooth Count Choices

The EVO TECH rear sprocket comes in several tooth counts: 34T, 35T and 36T for 2014-2021 models, and 38T, 39T and 40T for 2022 and newer models. A higher tooth count gives more low-end torque and quicker acceleration, which suits stop-and-go city use. A lower tooth count raises top speed, which works better on long, straight roads.

Specifications

• Chain Size: #428
• Inner Diameter: 58mm
• Diagonal Bolt Spacing: 89mm
• Material: Case-hardened steel
• Fits: Honda Grom and Monkey 125 (2014-2021 and 2022+ bolt patterns), plus Honda CR 80R, CT 70, XL 80S

Fitment

Fits:

• Honda Grom and Monkey 125 (2014-2021, 34T, 35T or 36T)
• Honda Grom and Monkey 125 (2022+, 38T, 39T or 40T)
• Honda CR 80R (1985)
• Honda CT 70 (1969-1994)
• Honda XL 80S (1980-1986)
• Honda XR 70R (1997-1999)
• Honda ZB 50 (1988)

How to choose: For a 2014-2021 Grom or Monkey 125, pick 34T, 35T or 36T. For a 2022 or newer model, pick 38T, 39T or 40T. Both versions use #428 chain and 89mm bolt spacing.

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