Is it rubbing on the inner fender, or the outer fender? If it's rubbing on the inside, then the wheel offset might be too high. If it's rubbing on the outer fender, then the offset is too little. Otherwise, it might just be the tire itself. Sometimes even if the tire size says that it's 225/45/18, (seems like you're using a drag/street tire) it might really be wider than that. If you get a different brand tire of the same size, it might not rub.