14-10-2011, 11:28 AM
I have 15" rims on mine although I've seen the tyre dealers sites that state that 14" rims are standard....Which is right??
My speedo, as checked on my Sat-Nav, is pretty much spot on with 185x65x15 and if I was to change the rim size to 14" I would need a
slightly fatter section (195) which may be a tight fit under the rear wheel arches, or a 185x70x14 to retain the accuracy of the speedo using this calculator:
http://www.miata.net/garage/tirecalc.html
My speedo, as checked on my Sat-Nav, is pretty much spot on with 185x65x15 and if I was to change the rim size to 14" I would need a
slightly fatter section (195) which may be a tight fit under the rear wheel arches, or a 185x70x14 to retain the accuracy of the speedo using this calculator:
http://www.miata.net/garage/tirecalc.html
The Older I get the Better I Was! 
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