Unfortunately, it's not that easy.  If you check the specs from the
manufacturers, you'll notice that a 25.7" diameter tire is need to turn ~805
revs/mile.  But every tire is different, all the characteristics of the tire
come into play when figuring out revs/mile: diameter, sidewall strength,
width, etc.

Cheers,

Jeff

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com]On Behalf
Of John Bange
Sent: Saturday, November 17, 2007 12:19 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Speed vs rpms w/ AT?

On 11/17/07, Michael Elliott <camping.elliott@gmail.com> wrote:
>
> Bitchin'. Thanks, John!

one other noteworthy bit: since the speedo is calibrated for 805 revs/mile,
if you have a left front tire that is anything but 25" in diameter
(5280/805*12/pi=25.0535582), your speedo indicated speed will be off a bit.
Personally, I hardly even look at my speedo, insted just using my GPS.

--
John Bange
'90 Vanagon - "Geldsauger"