428 Front Sprocket for Honda Grom & Monkey 125

428 Front Sprocket for Honda Grom, Monkey 125, and More

The Driven Racing EVO TECH 428 Front Sprocket is built to enhance the power output of a Honda Grom or Monkey 125. It targets riders who want a noticeable gain in torque and acceleration. Find it alongside other mini bike & pocket bike parts if you're looking to change how your bike performs, whether you're doing wheelies or riding on the highway.

Build Quality and Longevity

This sprocket is made from case-hardened chromoly steel, which helps it hold up against wear. A black-zinc semi-gloss coating gives it a clean look and guards against rust. The Driven logo is laser-etched into the surface, so it looks good as well as doing its job.

Fit and Setup

The sprocket is designed to mount on the Honda countershaft for an exact fit. Two M6x1.00 threaded holes hold it in place, so it can replace the original part without modification. Note that this 428-pitch sprocket will not work with a stock 420 chain. You'll need a 428 chain conversion kit to use it.

Specifications

• Material: Case-Hardened Chromoly Steel
• Chain Pitch: 428 (Conversion)
• Inner Diameter: 14mm (Peak to Peak) / 17mm (Valley to Valley)
• Mounting: Two M6x1.00 Threaded Holes
• Fits: Honda Grom 125/MSX125 (2014-2026), Monkey 125 (2019-2026), Super Cub C125, Trail 125 (CT125), CT70, XL80S

Compatibility List

Fits:

• Honda Grom 125 / MSX125 (2014-2026)
• Honda Monkey 125 (2019-2026)
• Honda Super Cub C125
• Honda Trail 125 (CT125)
• Classic Honda CT70 (3-Speed), XL80S, XR70R, ZB50
• ZS190 engine swaps
• Ohvale Mini-GP bikes

Choosing a tooth count: Only use 428-pitch chain conversion kits with this sprocket, since it won't run on a stock 420 chain. Choose 13T for the most acceleration, 14T for the best all-round balance, or 15T to keep the stock ratio.

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