Put those big 28" tires on, but your stock clutching won't be effective in turning those big tires. Helps restore power loss due to addition of larger tires. Designed for those who have 28"+ tires and play in sticky clay/gumbo mud. Allows for easier turning of larger tires in the mud. Designed to reduce belt slippage and reduce clutch heat. Better low end power and torque. Quicker backshift which results in crisp throttle response. You will see a top speed reduction. Notes: For 27" and larger tires. This kit is NOT recommended for trail riding. Sample kit shown, all kits will vary by model. Detailed Specifications: Designed for 28"+ tires. 0-3000' elevation.