Try this sitehttp://www.miata.net/garage/tirecalc.html
IMHO,I wouldn't go above 17.you will get a ruffer ride.
and the larger the rim the smaller the tire.If you hit
a pothole the chances of rim damage goes up. I like the looks of
larger rims,but don't like the risk.At least in cold weather
country.
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04 cool vanila Limited Turbo
Wife has a 03 limited
(Steel Blue)
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