I am number two at my dealership for one of its three RS6 sedans next spring/summer. I have owned several Audis previously, and respect them as winter cars. However, I am sure that whatever tires are installed on RS6 will be pure summer tires, and I would have to use my car at least occasionally in winter months here in the north central plains. We average 30 inches of snow a year. Given the fact that these cars will have some serious brake enhancements compared to an A6, what size winter wheel/tire combination will be best? I'm not aware of pure winter tires available in a nineteen (or even eighteen) inch size, and I don't think seventeens will fit over the brakes. Is the consensus to just go with an 18" all season tire, and take your chances? Thanks in advance for the advice. It makes little sense to me to own a Quattro equipped vehicle and have to park it all winter due to winter tire sizing issues.