If you go and read the exact size actually on your tire it may answer
this for you. Then enter that actual size into the calculator......

Mark

mcneely4@cox.net wrote:
> ---- mark drillock<mdrillock@COX.NET>  wrote:
>> And if you look at the tire manufacturer spec tables it makes clear the
>> fact that the Miata.net calculator is bunk.
>
> for what it's worth, the revolutions per mile for the Hankook R08 given from the manufacturer and supplied yesterday by Dennis, and that given on the Miata.net calculator for that same tire size (185R75-14) are the same at 809 rpm.
>
> that does not mean that the conversions the Miata site published are always correct, it just means that the revolutions per mile published by these two sources for that tire and tires of that size agree.
>
> mcneely
>
>>
>> Mark
>>