Currently running 18x8.5 ET35 wrapped with 225/40 and no rubbing on mine. Should be a relatively close fitment to what you're considering on the outside of wheel/fender at least. I am also running this on ST X coil overs and for what it's worth I love em. They ride better than stock 95% of the time. The only time they're a little rougher than stock is on big bumps. They're a bit more harsh but I wouldn't say its more than a 15% increase at most. Super duper dailyable set up and they handle corners way better as well. Can't recommend the ST X enough.