I see that on Dunlop's web site www.dunloptire.com they list both static radius
and rolling circumference. If you calculate the circumference based on the
static radius the resulting circumference is slightly less than what they list
for rolling circumference - the difference must be the result of centrifugal
force.
Kevin
bown wrote:
> Hello All,
> Once when trying to get a speedometer to read correctly I came to the
> realization that the tires grow some at highway speeds due to centrifical
> force. My careful calculation would never quite work out correctly until I
> realized what was happening.
> Regards,
> Jim B.
>
> ----- Original Message -----
> From: "Kevin & Deana Brown" <MGTRAutoXr@sprintmail.com>
> To: "Larry Hoy" <larryhoy@prodigy.net>
> Cc: "MG V8 List" <mgb-v8@autox.team.net>
> Sent: Friday, February 02, 2001 11:20 AM
> Subject: Re: Tire circumference
>
> > Larry,
> >
> > No it doesn't because the tire is depressed slightly by the weight of the
> car, the actual rolling circumference will
> > depend on the air pressure in the tire. If you are trying to measure it,
> either measure the radius from the center
> > of the wheel to the ground and calculate the circumference or put a mark
> on the tire and on the ground, push the car
> > so that the tire roles one revolution and measure back to the mark on the
> ground.
> >
> > Kevin Brown
> > Larry Hoy wrote:
> >
> > > Does the measured circumference of a mounted and inflated tire equal the
> rolling circumference of the same tire?
> > >
> > > Larry Hoy
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