stock e92 m3 18" 260 wheel fitment.
8.5"x18 et 29 front & 9.5 x18 et 23
front fitment is less than ideal, needs significant camber to tuck into the fender ( not an issue with my aggressive track setup) running a 235/40 semi slick and this is as far as i comfortably can go, 245 i tried before hand rubbed significantly ( luckily i only tested static and by getting my GF to turn wheel while stationary so no damage caused)
Rear fits perfectly, on semi slick no larger than a 265/35 , anything larger will rub.
ill report back after my first track day, i may need to dial I more camber up front as it may still rub with -2.7 i have at the moment, its definitely close.
All in all this really works well on an aggressively setup car and looks very nice, the fenders are filled like pamela anderson's Bra.