I ran the 235/35/18 Mxx3's on my M3, and the ride is actually not as harsh as one would expect. That tire in this size is a very popular option for E36 cars, and it does indeed fit nicely. The 235/35/18 is a nice look on the cars too. The small sidewall looks nice and sporty without being too short overall so it works well. If you have other questions, let me know.... Aaron 800.428.8355 x395