I have an 06 KQ and bought some ITP wheels and XT-R tires for it and they are perfect for the vehicle!! I stayed with the 25" tire so I wouldnt kill power. You can still reach the vehicles top speed of 72 (rev limiter) and at the same time you gain a tremendous amount of traction in adverse ground conditions. I went on a 35 mile ride yesterday with some guys that had king quads but with stock tires and I was the only one to make it through every mud hole or deep creek we came too. No need to put heavier or larger diameter tires on it!