Driven Racing 428 Front Sprocket for Honda Grom & Monkey 125

Performance Gearing: Driven Racing EVO TECH 428 Front Sprocket

Take control of your Mini-Moto’s power delivery with the Driven Racing EVO TECH Front Sprocket. Engineered using proprietary EST Technology, this is one of the lightest 428-pitch steel sprockets on the market. Whether you're looking for wheelie-popping torque or smoother highway cruising, these sprockets are the gold standard for Honda 125cc builds.

The Driven Racing Advantage

• EVO TECH Weight Reduction: Drilled and machined surfaces remove unnecessary rotating mass for faster throttle response without sacrificing strength.
• Case-Hardened Steel: Manufactured from high-strength chromoly steel for maximum longevity and wear resistance.
• Premium Finish: Features a laser-etched Driven logo and an attractive black-zinc semi-gloss finish to prevent corrosion.
• Made in the USA: Precision-engineered for a perfect fit on the Honda countershaft.

Complete Model Fitment Guide

CRITICAL NOTE: This is a 428-pitch sprocket. It will NOT work with your stock 420 chain. This is intended for 428 chain conversion kits.

Technical Specifications

• Chain Pitch: 428 (Conversion)
• Inner Diameter: 14mm (Peak to Peak) / 17mm (Valley to Valley)
• Mounting: Two M6x1.00 Threaded Holes
• Material: Case-Hardened Chromoly Steel
• SKU: 169-540

Gearing Cheat Sheet:
• 13T (Best Acceleration): Maximum torque for wheelies and short tracks. Top speed limited to ~65mph.
• 14T (Improved Snap): The "sweet spot" for most riders. Better acceleration with minimal top-speed loss.
• 15T (Stock Ratio): Best for big-bore kits or riders looking for lower cruising RPMs.

Note: 1 tooth down on the front is roughly equivalent to adding 3 teeth to the rear sprocket. Orientation matters—install with the laser-etched logo facing outward.