That Miata calculator does not give me the numbers close to the factory
numbers at all. What are you using for aspect ratio? I thought you got
this already. The Miata.net toy does not have an option for 82 so 80 is
the closest. When I put that in for 185/80R14 it gives 786 not 809. You
only get 809 if you use the very wrong aspect ratio of 75.

Mark

Dave Mcneely wrote:
> ---- Robert Stevens<mtbiker62@GMAIL.COM>  wrote:
>>>
>>> I've been using http://www.1010tires.com/tiresizecalculator.asp to
>>> see sizes, revs&  all that stuff for different sized tires.
>>
>
> And, for whatever it is worth, this calculator gives 810 and a fraction revolutions per mile for the Hankook RA08 (or any other tire) in the 185R14 size, and 790 and a fraction for a 195R14 size.  That's very close, but not exactly the same, as the 809 that the Miata site gave for the 185 tire (the difference is less than 1%).
> --
> David McNeely
>