Getting a set of skinny steelies with matching winter tires is supposed to help snow performance a lot. It doesn't seem to make sense when compared to normal traction thought (wider=better), but take a look at rally cars driving in snow if you don't believe me. They all use tiny pizza cutter tires.
I guess putting the car's weight on a smaller contact patch makes you not float over the slush as much, or something.
Also, it saves your nice shiny summer wheels from having to deal with all that sand/salt on the roads.
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