Proper tire size for 20" rims
http://www.miata.net/garage/tirecalc.html
A nice little utility for getting as close as you can to stock height/etc for speedo calcs
A nice little utility for getting as close as you can to stock height/etc for speedo calcs
According to the tire calculator, the 275/55 20 would be a better size as it is only 1.1% slow in the speedo reading.
If you go 275/65 20, that's 3% too slow. So speedo reading 60mph you are really going 64.3mph
If you go 275/65 20, that's 3% too slow. So speedo reading 60mph you are really going 64.3mph
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