All...I am a 5 series owner and might be looking to purchase a 2006 BMW M6...I live in Minneapolis, so needless to say the horsepower and rear wheel drive will become an issue. The car comes with stock 19" rims and tires. Important will be the winter tires I get an rims. I have read a bunch of different takes, and the bigger the tire and rims, the more problems it can create to the car such as potholes, curb, et cetera. I have heard biggest to consider for winter ties is 18". Does anyone have some good feedback on that size for the winter months or line of rims?