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Date:         Tue, 16 Mar 2010 14:28:00 -0700
Reply-To:     mark drillock <mdrillock@COX.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         mark drillock <mdrillock@COX.NET>
Subject:      Re: Revs per mile , was: 15" VS. 16' WHEELS
In-Reply-To:  <6da579341003161332o76a2ae99y1a1ada87a854e905@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

You can look up any number of manufacturers rev/mile for a given size. You will find they tend to group together in a range and then you will see that the Miata Tire Toy program calculates a value for that size that falls outside of that group. You could say that none of the tire companies can count or measure but I would say the Miata Tire Toy program makes erroneous assumptions and then gives false results.

Also, axle center to ground distance is a poor way to measure tires for revs/mile purposes as inflation pressure affects that static measurement to an extent that greatly exceeds its effect on true revs/mile while rotating.

Mark

John Bange wrote:

> > I would love to trust the manufacturer's quoted numbers, but when the Revs > per Mils and the diameter they state don't match, it's hard to take them > completely seriously. I suspect they might use the largest possible > diameter, and the smallest possible rolling radius. Given that, I tend to > use the mathematical number initially, and then actual physical measurement > after they're on the vehicle (axle center to ground, and GPS mileage vs > miles clocked that assume 805 RPM). > > -- > John Bange >


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