The actual width of the sidewall has a lot to do with brand and style. I suggest turning your current tires to lock, left or right, and measure the clearance to the steering/suspension and the inner fender liner. Check both, inside clearance and top clearance.
Then go to http://www.miata.net/garage/tirecalc.html
and check the rotational difference. Your speedo will be 3mph slower than it is now.
If Carmel, IN is in the "lake effect" area, I would suggest getting snow tires that have a narrower tread, like 205, with the higher aspect ratio to get them to proper diameter. Find some used wheels for the salt and save the nice ones for summer. Your car's user manual has the proper winter size suggestion.
Klaus
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Proud owner of a 1967 220S
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