I was just wondering about this because i'm probably goin to be buying new tires on saturday (realtors for the snow). I wanted to know how a 400ex pulls larger tires, i will be lowering the gearing and i have a pipe,k&n,dynojet,advance key and lidless and i'll be adding a stage 2 cam in a couple months.

 

a friend of mine has a 02 400ex with a pipe,filter,open airbox and jets and he tried a set of 22inch spidertracs and he ended up with no bottom end but he didnt mess with gearing..