Straight out answer, no they won't rub. I had 18x8 +42 on s.techs and they did not rub at all. Maybe if ur carrying a couple hundred kilos of cement in the rear. But you should be fine. As you lower the car, the car naturally dials in some camber. And you'll be fine for the fronts.
You best bet is to run 225/40/18. But you may be able to get away with 235/40/18 too.



