Specification Sidewall Radius Diameter Circumference Revs/Mile
155/80-13 4.9in 11.4in 22.8in 71.5in 886
175/70-13 4.8in 11.3in 22.6in 71.1in 891
This is from a chart/calculator a lister sent me to check tire sizes.
Seems to me the 175/70s are a tad thinner and shorter than 155s.
But I do have 175s on the 58 and they sure look wider than 155s.
http://www.miata.net/cgi-bin/tirescgi
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Frank Clarici
Toms River, NJ
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