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21 inch winter tire at tire rack

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You will be far better off with a set of 19" wheels and snow tires. In a snow tire you want as much flexible sidewall as possible so that the tread will be able to conform to the irregular surface (hard packed snow to pavement transition).
 
Jerry, I completely agree but some people will use the Model S as a second car or live in areas where cold occurs infrequently enough that this might work well.
I personally use Nokian Hakka tires.

That's what I thought too, here in St. Louis where it's not all that bad. All it takes is one cold day and a pothole, 21" tires turn into brittle rocks.

Can't wait to get those 19" wheels on.