-------- Original Message --------
Subject: Re: tire circumference
Date: Fri, 14 Oct 2011 20:33:47 -0600
From: Richard A Jones <Jones@Colorado.EDU>
To: Vanagon Mailing List <vanagon@gerry.vanagon.com>

Mark wrote:
>   The Miata.net toy does not have an option for 82 so 80 is
> the closest. When I put that in for 185/80R14 it gives 786 not 809. You
> only get 809 if you use the very wrong aspect ratio of 75.

I'm with Mark--let's bury this Miata tire site for good.  It has
come up over the last N years, where N might be as large as 10.
It is ALWAYS pointed out that the revs/mile are not accurate.
Search the archives to see.

I checked 3-4 tires and the diameter of the tire seems to match what
the manufacturer states, but the revs/mile are always ~20 fewer.

The Miata.net site state:
> If you won't do anything else, at least read the MX-5 Miata
> Forum FAQ. If you post a question that is already answered in the
> FAQ, you will be teased, ridiculed, laughed at, and probably won't
> feel too comfortable on the forum.

Could not we take the same approach about their tire calculator?
Read OUR archives and you'll see that it has been pointed out
over quite a few years that it is a worthless site to get revs
per mile for Vanagon tires.

Again, let's just bury the Miata site and not try to argue that
it....  Whatever.

I'm going to repost this messagte with a subject "Miata tire
calculator."  That will surely stop this nonsense.  In the future
anybody (ANYBODY) will find this message before they propose
the Miata site as useful.  ;-)

Richard