[Spridgets] No real difference in tires

[Larry Macy]

175 or 155 is the tread width in mm (I think). the 80 or 70 is the  
profile. It is defined as 80% or 70% of width. So a 155/80 is 155 mm  
wide at the edge of the tread and the sidewall is 124mm (155mm x 80%).  
the 175/70 is 175mm wide at the tread and the sidewall is 122.5mm high  
(175mm x 70%). Sidewall is the distance from the tread to the bead on  
the wheel. So the 175/70 is wider and shorter. The numbers you have  
below does not include the width, but the sidewall and diameter  
numbers are correct.

Larry

On Jan 9, 2008, at 10:16 PM, Frank Clarici wrote:

> 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
> -- 
> Frank Clarici
> Toms River, NJ
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