Here's the winter wheel setup I'm using for the season here in Chicago area. I called Doc at Tire Rack to sort me out with some tires. I started out about to order Blizzaks and ended up with Continental DWS tires. Tire sizes are 245/40/20....wheels are BMW style 373M. Offsets are pretty close to OEM, with the rear having a slightly higher offset; I'll probably get some 10 to 15mm spacers to widen the rear track a little more. I am using the BMW center caps (they aren't pictured), but just finished wrapping them in 3m cf-style vinyl to cover the BMW logo. Come Spring, I'll probably be ordering some aftermarket 20" wheels with summer tire. I'll probably be looking to sell my 21" P85+ staggered setup soon.