Consideration of changes in effective tire circumference etc. is ok, but I
have taken a different approach: Actually measure your MPH using mile
markers and a stopwatch, or better yet use a GPS device which gives you
precise MPH. I have a $200 handheld which gives MPH, altitude, lat and long
coordinates, and serves as an odometer as well. I believe some cell phones
have these built in as well. Very handy.
Jim Smith
----- Original Message -----
From: "Richard Hosmer" <rahosmer@citlink.net>
To: "M Lempert" <mlempert@bellsouth.net>; "Ron Osowski"
<rosowski@tampabay.rr.com>; "Healey List" <healeys@autox.team.net>
Sent: Wednesday, July 11, 2007 1:06 PM
Subject: Re: [Healeys] High rpm's plus COOLING UPDATE
> Mike,
>
> I believe you are correct so far as the resting imprint is concerned, and
> that the nominal computed circumference is "close enough" at modest
> speeds -
> however, at very high speed the tire will have "expanded" enough to make a
> small difference in theoretical MPH calcs. I also suspect that this effect
> is significantly less with our modern radials than it used to be with the
> bias-ply Roadspeeds.
>
> Dick Hosmer
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