Team ATV Clutch KitStock Tire Clutch Kit:These kits are high performance trail kits that improve throttle response and increase back-shifting. The components provided in the kit supply the most aggressive up-shift and acceleration possible. This kit also allows improved belt squeeze to reduce belt slippage and excessive clutch heat. Big Wheel Kits:Deep mud and big tires, grab the throttle and hang on! These kits are designed for maximum bottom-end and mid-range pull. Each kit includes a set of custom weights and springs to prevent belt slippage and improve the acceleration of your ATV. These kits were designed for ATVs using 27" or 28" aggressive tread tires.