Originally Posted by Cortexiphan
Everybody recommends 18" square setup with narrow Blizzaks. But in tirerack.com when I choose M3, it only gives me the option of WS60 with 18"s, not LM60s, and I'm guessing it's too much for Boston and I heard those tires are not good on dry. I need a complete solution, but BMW's ridiculous almost $4000 solution is just a waste.
Talk to Ben from TireRack, he helped me out.
I went with the A7 Sport Edition wheels with 8" in the front and 9" in the rear. I wanted to keep the rear a bit wider for the grip with all the power the car has. For tires I went with the Dunlop WinterSport 3D. I was worried that Blizzaks might be overkill for our winters. I've had them on the car for about a week and I am quite happy with them. They have decent reviews in general and I believe they should be more than adequate for Boston winters.