musclecarconvert, PM peppy as he is also running the same size wheels/tires that you are looking into. I run a 275/35/18 or a 285/30/18 on CCW classics(backspacing of 7.5) with stock fenders/no rolling/stock fender lines without issue. I logged 5000 track miles last year on my set up and it never gave me a problem. I'm running 275/35/18's again this year as a class requirement. If I decide to move up to the next class, I'm going to pull the camber in some more and put 295's on up front.