The sizes you state will only give you a slightly taller tire, with no change in tire width, so there should be no rubbing.I currently have 235/40/18... Can we run 235/45/18 on the R without any rubbing? The 45 would give me just slightly more tire and in the area I could use it if I want to enjoy driving my R.
^this... I actually run a 245/40/17 and rub less with the wider/shorter tire. I think you will most definitly rub more with a taller tire.By increasing the tire's sidewall height from 94mm 105.75mm you will most certainly further limit your steering angle as the tire will hit the inner fender that much quicker on what will be less-sharp full lock turn.