• Driven Racing 428 EVO TECH rear sprocket for Honda Grom and Monkey 125
  • Driven Racing EVO TECH sprocket detail showing bolt pattern
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Scooterworks

Driven Racing 428 EVO TECH Rear Sprocket for Honda Grom & Monkey 125

Driven Racing 428 EVO TECH Rear Sprocket for Honda Grom & Monkey 125

$39.90 USD
$39.90 USD
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Shipping calculated at checkout.

Change your Grom's gearing with a CNC-machined, case-hardened #428 rear sprocket made in the USA. More teeth gives stronger low-end pull; fewer teeth trades that for higher top speed and lower RPM.

🔍 Does this fit your bike?

  • 2014-2021 Grom / Monkey 125: order 34T, 35T or 36T.
  • 2022+ Grom / Monkey 125: order 38T, 39T or 40T. The bolt pattern changed in 2022.
  • Stock rear sprocket: 34T (2021 and earlier), 38T (2022+).

⚠️ Before you order

  • Pick by model year. The wrong bolt pattern will not fit.
  • This is a #428 sprocket; check your chain size.
  • Gearing rule of thumb: dropping 1 front tooth is roughly adding 3 rear teeth.
  • No returns on performance parts — please double-check your model year and fitment before ordering.

✓ What's in the box

  • 1 rear sprocket in the tooth count you choose
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