cool - i have been looking at 18x8.5's, with 255/35-18s. i think it'll be close, it's +45, prob gonna go with RS4s or RE71Rs.I'm running a 17x8.5 wheel, and I wouldn't want any wider with the stock fenders. The size of the really depends on the model you run, because each one runs slightly different despite being the same size on papaer. For example my Yokohama AD08R size 225/45R17 ran extremely wide for their size, whereas the Nitto NT01 were more true to their size. You can look at manufacturers treadwidth tables on their websites to confirm.