Ah, common sense.  Who'd of thought such a thing possible.  Thanks Michael

---- Michael Snow <slowmachine82@GMAIL.COM> wrote:
> Ya gotta love a discussion that just never ends...
>
> http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=7
>      "WARNING: These calculations (and those provided by all online tire
> dimension calculators) only reflect nominal tire dimensions, which are
> often subtly or substantially different than the tire's actual physical
> size and/or the dimensions provided by the tire manufactures."
>
>
> Euro-Metric tire sizes like 185R14 are 82 aspect ratio.  185/80R14 is a
> later sizing standard, not the same.
> http://www.tirerack.com/tires/tiretech/45_conversionchart.html
>
>
> A sampling of some manufacturers' published 185R14 revs/mile data:
> Kumho 857                 817
> Yokohama Y356 D           809
> Yokohama Y356 C           808
> Continental Vanco 2       811
> Nokian Hakka C Van/Cargo  817
> Hankook RA08              811
> The spread between the smallest and largest is 9 revs/mile, a bit over 1%.
>
> Tires change size throughout their useful life as the tread wears.  You
> can't expect much in the way of precise specifications for something
> with this much variation in size.

--
David McNeely