Wouldn't a chalk mark on the tire and a chalk mark on the pavement net
the same measurement?
Yes I know your kidding.

Stan Wilder

On Wed, 9 Oct 2002 09:49:30 -0700 pensioner <al_knoll@PACBELL.NET>
writes:
> Use the French method.  Using French's or some other less well
> calibrated
> mustard, place a substantial line of mustard in front of the rear
> wheel.
> Drive through the mustard until you have between two and three
> revolutions
> of the front wheels.   Using a steel tape measure, a laser
> interferometer or
> other suitable measuring device measure from the leading edge of the
> first
> mustard mark to the leading edge of the third mustard mark (two
> rotations).
> Accuracy to plus or minus one nanometer is not necessary.
>
> This will give tire rotation times 2 in your favorite unit of
> measure with
> enough accuracy to do practical calculations.
>
> NB:  Drive in a straight line when marking, preferably after warming
> up the
> normally inflated tires on your normally weighted vanagon.
>
> With the rollout thus determined you can use the T. Smith tool to do
> all
> sorts of calculations.
>
> A copy of the MS Excel gearing tool can be found on the alternate
> list
> (Yahoo Group Vanagon) or the Subaruvanagon group.
>
> Cheers,
>
> pensioner
>
>

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