Quote Originally Posted by barefoot greg View Post
goin from a 31 to a 33.5 should give you about an 1.25 inch gain in clearance. the center of both tires will mount to the hub in the same spot. so of the 2.5 inches of difference in size, half will be on top, and half will be on the bottom( which is what is going to add clearance)
Oops, I forgot to take the delta and half it.

Duh! One of those days. Thanks for catching my goof!