Originally Posted by footie
I would be surprised to find any difference. Is it not true that the M3 like Audi offer a winter alloy/tyre option and in the case of the S5 the option is an inch smaller rim size. Unless the offset is different then I can't see any problem.
BMW _does_ offer an M3 winter tire/alloy combination, at least in Europe. I just ordered and got a set installed, it's ordered as a complete set and comes mounted with Michelin Pilot Alpin PA3's.