These GYTR Rear Sprockets are made from 7075-T6 billet aluminum CNC-machined for maximum fit accuracy. Features a radial mud groove etched just inside the sprocket teeth to shed mud and grit which saves weight and increases chain life. Sprocket sizes other than stock are for closed-course competition only on '06 and later off-road models and all street legal models. Changing the final drive ratio affects exhaust emissions and also affects speedometer readings.
- Fits '03-'21 YZ450F, '16-'21 YZ450FX; '01-'21 YZ250F, '15-'21 YZ250FX; '03-'21 WR450F, '15-'21 WR250F; '99-'21 YZ250, '16-'21 YZ250X; '99-'21 YZ125, '20-'21 YZ125X