Widest 18" wheel under the rear of E92 M3?
I have been able to fit TR Motorsport 18"x10" with 295/30/18 with no issues in the rear and a 18"x10" front 285/30.
Has anyone fit something larger (width only) on the rears? 18 inch is important over other sizes because of DOT legal track tire sizes available. I think that the car needs a 305 or 315 tire.
Speculation is appreciated if you have some facts. (Oh wait, speculation is seldom based on facts).