I'm in Chicago, so similar weather. I also plan to take it to the track and well as some ski hills in WI. Thus, a winter set is a must imo.
If you don't have the wheel & tire package with the bigger brakes, you can go 18's in the winter if you choose, or stick with 19's. I personally think 20s look too big for summer (and the tires are much more expensive).
I think the 797M's or you 791M's in a square setup will work for winter an the 893M staggered setup for the summer.
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