Ok, if the lip is the same I'll go with the 30 for a better fitment. I have 225/40/18's on the front right now on a 7 inch wheel. They should be ok on the 8.5, right? I know it will have more of a stretch, but thats what I wanted.
I'm planning on switching the rear tires too. The rears are currently 245/45/18 on a 7 inch wide wheel. Will those be ok to go on the new 9.5 wide wheels?