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From: Tegger on 10 Nov 2009 14:01
"C. E. White" <cewhite3(a)mindspring.com> wrote in
news:hdbqa5$nul$1(a)news.eternal-september.org:

> I got the information on your tire from
> http://www.hankooktireusa.com/Handler/RequestFileHandler.ashx?fileName=
> PRODUCT/CATALOG/H418_Catalog.pdf&siteCode=
>
> According to the Hankook information, the revolutions per mile for a
> Optimo H418 - 195/60-14 is 895. This implies a rolling diamter of
> 22.53" (radius = 11.27"). This is dead on with your left rear tie
> measurement and very close to your front left tire measurement.



There's an interesting additional component to this: I haven't so far
mentioned the RIGHT tire.

My left and right front tires have "settled" to different hub-road radii
(right being 1/8" taller). When the LEFT front tire had completed ten
revolutions, the RIGHT tire had lagged by just short of an inch. This
happened four times in a row. Pressures were identical in both tires.

There's obviously something else at work here besides the steel belt. All
four of my tires travelled slightly different distances from each other,
with the greatest differences being front-to-rear. It appears to me that
hub-road radius DOES make a difference, but less than that which I had
originally thought.



--
Tegger

From: C. E. White on 11 Nov 2009 19:58

"Tegger" <invalid(a)invalid.inv> wrote in message
news:Xns9CBF8E75E9EC1tegger(a)208.90.168.18...
> "C. E. White" <cewhite3(a)mindspring.com> wrote in
> news:hdbqa5$nul$1(a)news.eternal-september.org:
>
>> I got the information on your tire from
>> http://www.hankooktireusa.com/Handler/RequestFileHandler.ashx?fileName=
>> PRODUCT/CATALOG/H418_Catalog.pdf&siteCode=
>>
>> According to the Hankook information, the revolutions per mile for a
>> Optimo H418 - 195/60-14 is 895. This implies a rolling diamter of
>> 22.53" (radius = 11.27"). This is dead on with your left rear tie
>> measurement and very close to your front left tire measurement.
>
>
>
> There's an interesting additional component to this: I haven't so far
> mentioned the RIGHT tire.
>
> My left and right front tires have "settled" to different hub-road radii
> (right being 1/8" taller). When the LEFT front tire had completed ten
> revolutions, the RIGHT tire had lagged by just short of an inch. This
> happened four times in a row. Pressures were identical in both tires.
>
> There's obviously something else at work here besides the steel belt. All
> four of my tires travelled slightly different distances from each other,
> with the greatest differences being front-to-rear. It appears to me that
> hub-road radius DOES make a difference, but less than that which I had
> originally thought.

I am sure it does make a difference (a small one), as do many other factors.

Ed

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