Contact varies car to car. The 4/4 wheels have more inset than either Plus4 wheels or Roadster wheels.
I fitted BRBs to my 2012, and drilled the holes as inboard as possible, filing the corners to allow maximum adjustment, and they didn't touch with 185/70s.
My 2016 as delivered did touch, and this caused a braking effect on full lock. Again with 185/70s, which are standard on the narrow Plus 4.
So I squeezed the lower section in the vice, and slotted the holes, and added washers to lift the ends, and now I can fit a piece of paper between tyre sidewall and BRB. So still tight.
