Oh it doesn't make the stiffness THAT bad, not enough to harm it too bad. But it really does pinch the bearings a lot. so much so that the front right wheel won't free wheel(has a one way in the front) with it tightened up. I do think its better to have it a little bit looser because of the efficiency, but have any other Evo IV owners had that problem, or know of any fixes to it??