The best all around use kit.If you do a little bit of everything with your quad this is the kit for you.Great for trail riding, occasional mud and sand riding, plowing and hauling.Makes up for the power loss and slow response of adding oversized tires.Better low end and midrange acceleration.Quicker backshift which results in crisp throttle response.Reduces belt slip and clutch heat.Kits designed for stock or oversized tires.This item fits the following vehicle applications:compatible with Polaris Sportsman 850 2020compatible with Polaris Sportsman 850 2017-2018compatible with Polaris Sportsman 850 Premium 2020compatible with Polaris Sportsman 850 SP 2017-2018