My T4 runs on Audi A8 genuine alloys ET35 with 255 45 18's, it's lowered appx 50mm, did have issue with rubbing on the inside of the arch in the front when it was lowered 60mm, but after winding it back up 10mm and fitting bigger bump stops (from a Mini) no further probs I: They do stick out a little at the front though but passed MOT 3 times since fitting.