tire size vs. rim size

[Josh Ormsby <josh@xxxxxxxxxxxxxxxxxxxx>]

I don't meen to interrupt, but are you guys talking about tires with 
different diameters, or similar tires on rims of different sizes?

That never was clear in this thread.

Josh
'85 e-30

At 08:43 AM 6/11/2001 -0400, you wrote:

>------------------------------
>
>Date: Mon, 11 Jun 2001 08:42:29 -0400
>From: Nicolas.Roman@domain.elided
>Subject: Re: how tire size affects tire wear
>
>if you can't see that, i am not explaining...
>
>(Embedded image moved to file: pic00288.gif)
>Nicolas Roman
>Senior Engineering Consultant
>North Miami Beach, FL.
>
>
> 
>
>                     "Ron 
 >
>                     Buchalski"           To:     Nicolas.Roman@domain.elided 
 >
>                     <rbuchals@hot        cc:     bmw-digest@domain.elided 
 >
>                     mail.com>            Subject:     Re: how tire size 
> affects tire wear
>                     Sent 
> by: 
>
>                     owner-bmw@dig 
 >
>                     est.net 
 >
> 
>
> 
>
>                     06/08/2001 
 >
>                     02:44 
> PM
> 
>
> 
>
>
>
>
>
> >Date: Thu, 7 Jun 2001 10:24:40 -0400
> >From: Nicolas.Roman@domain.elided
> >Subject: Re: how tire size affects tire wear
> >
> >At 10:06 AM 6/7/01 -0300, Joao T. da Costa wrote:
> >>>The contact patch is larger--otherwise there would be no advantage to
> >>>wider tires.
> >
> >>Hhmmm... isn't the contact patch of a 17 inch 245 series tire the same as
>
> >>the contact patch of a 18 inch 245 series tire?
> >
> >NO IT IS NOT THE SAME... AN 18" HAS A LARGER CIRCUMFERENCE AND THEREFORE
> >THE CONTACT PATCH WILL BE LARGER IN THE LONGITUDINAL DIRECTION....
>
>What?  Prove it!
>
>If you have two tires, both with equal width, and both on equal width rims,
>
>the air pressures are equal, and the weight on that corner of the car is
>the
>same for both cases, why will a larger circumference make a difference in
>longitudinal contact patch?
>
>The size of the contact patch (square inches) will be the same.  And, in
>this case, it will be the same shape, too.
>
>- -rb
>
>_________________________________________________________________

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