• Driven Racing 428 EVO TECH front sprocket for Honda Grom and Monkey 125
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Scooterworks

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

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

$19.95 USD
$19.95 USD
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Shipping calculated at checkout.

Change how your Grom delivers power. This lightweight, drilled EVO TECH front sprocket from Driven Racing is made in the USA from case-hardened chromoly with a black-zinc finish, and it sheds rotating mass for quicker throttle response.

🔍 Does this fit your bike?

  • Honda Grom 125 / MSX125, 2014–2026 and Monkey 125, 2019–2026.
  • Also listed for Super Cub C125, Trail 125 (CT125), CT70 (3-speed), XL80S, XR70R, ZB50, ZS190 engine swaps and Ohvale Mini-GP bikes.
  • 428 pitch. Specs: 14mm inner diameter (peak to peak) / 17mm (valley to valley), two M6x1.00 threaded holes.

⚠️ Before you order

  • This is a 428 sprocket and will NOT work with a stock 420 chain. It's meant for 428 chain conversion kits.
  • No returns on performance parts — please double-check your model year and fitment before ordering.
  • Gearing guide: 13T gives the best acceleration but limits top speed to about 65 mph; 14T is the usual sweet spot; 15T is the stock ratio and suits big bore kits or lower cruising RPM.
  • One tooth down on the front is roughly equal to adding three teeth on the rear.
  • Install with the laser-etched logo facing outward.

✓ What's in the box

  • One front sprocket in the tooth count you choose
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