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. Manufacturer Compatible Models Honda Grom 125 / MSX125 (2014-2026), Monkey 125 (2019-2026), Super Cub C125, Trail 125 (CT125) Classic Honda CT70 (3-Speed), XL80S, XR70R, ZB50 Other ZS190 Engine Swaps, Ohvale Mini-GP Bikes 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.