Recieve maximum engine performance by tuning your clutch. Use these clutch kits with stock-size tires or with 27 or 28 aggressive tread tires. Improve throttle response and increase back shifting for high-performance trail riding by using these clutch kits. Kits improve the belt squeeze to help reduce belt slippage and excessive clutch heat. Our clutch kits were created to provide the most aggressive up shift and acceleration possible. All kits are for 0-3000 ft. of elevation.