Originally Posted by quality_sound
Yep. More sidewall is better for snow traction. If I could have gone with 17s I would have.
Yep, 18 is the right size when it comes to winter set-up for the M3: better traction (taller sidewall), more available sizes, cheaper, etc... However, I'm very tempted about 19'' VMR VB3s for winter duties. They look great and they are pretty affordable at $900. The original plan was to buy a set of used E9x OEM 18s, but I can't find them anymore. I really like these wheels.