[Farmall] MPH per thousand revs

[Robert Johnson]

Yes , you are right Jim , there was an obvious difference , even on the
truck , but I have a pretty good idea of what is the situation. Thanks for
everyones help.
Regards Rob Johnson.
----- Original Message ----- 
From: "Jim Becker" <jim.becker at verizon.net>
To: "Farmall/IHC mailing list" <farmall at lists.antique-tractor.com>
Sent: Saturday, October 23, 2004 10:18 PM
Subject: Re: [Farmall] MPH per thousand revs


> There can be quite a bit of variation in circumference between tires that
> are supposedly the same size, especially so for older style bias ply
tires.
> You will probably get a better number by direct measurement rather than
> calculating it.
>
> Check your tire pressures.  Put a chalk mark on the tire and another on
the
> ground at the same point.  Roll the truck one revolutin of the tire and
put
> another chalk mark on the ground in line with the one on the tire.
Measure
> the distance between the two marks on the ground.  Going several
revolutons
> and measuring the whole distance will improve the accuracy some more.
>
> Jim Becker        jim.becker at verizon.net
>
> ----- Original Message ----- 
> From: "Howard R Pletcher" <n9ads at juno.com>
> To: <farmall at lists.antique-tractor.com>
> Sent: Friday, October 22, 2004 11:20 PM
> Subject: Re: [Farmall] MPH per thousand revs
>
>
> > The circumference of the tire in feet will be
> > 2 x Pi (3.14) x R/12.  The Tire Revs/Mile will be 5280/Circumference.
>
>
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