I have ridden with lots of different tires on my atv's. Kenda, ITP, Dunlop, etc... When I get a new quad I always replace the tires with Razr mx's because they just hook up so nice on all types of terrain from hard pack to soft, to slightly muddy. I know they are designed for closed course competition, but they perform well as a trail tire too. I'm not saying you want them on for mud bogging or hitting the dunes, but for everything in between this is the tire to buy. They hook up better and are more predictable than ITP Holeshots. I have Holeshots on the KFX450R I just bought and I am on motosport.com now buying new Razrs to replace them. For a little more ground clearance try the Razr 20" rears. Also the raised center rib design of the Razr fronts make your quad predictable in corners with excellent feedback, and straight as an arrow down the straights. I've found that running 5psi in the front and 4psi in the rear works well for MX style riding. Also I would like to add that even though these are only 2 ply tires (to keep weight down) I have never had a puncture, even on rough trails. They are as tough as other manufacturers 4 ply tires!