Originally Posted by SWP n Gold
08-13 STIs run 18x8.5 (245/40/18) setup. You can get away with a 225/40/18 on an 18x8 wheel, but it would be smaller in diameter than your stock wheel/tire setup. Just grab 235/40/18s and you'll be fine. 245/40/18 is the absolute maximum you would want to run on an 18x8 wheel and it's overkill in my opinion.
Thank you for the heads up