Originally Posted by growling_boxer
so, you're getting more clearance because you are going to a shorter overall tire diameter (as well as narrower). it has nothing to do with being on a 17 vs. 18, which is what you claimed, and could be very confusing to someone who doesn't understand how this works. I am trying to make it as clear as possible for the OP here. he could just as easily have decided that 225/50R17 was the right size because it is closer in overall diameter than a 225/45R17, especially if he doesn't want to lose 0.38" in ride height. and that 0.38" is also the amount of extra clearance you have above, although the narrower tire helps you get in there at an angle.
let's be clear here for the people that don't understand how it all works.
Exactly what I stated from my very first post that over all thinner and smaller diameter so what's not so clear
Edit: as far as ride height goes if u r at stock height is not going create any issues as appose to having very little wheel well clearance for buildup of snow and ice.