RE: [ST] 190 on rear

["colt4530@xxxxxxxxxxx" <colt4530@xxxxxxxxxxx>]

It does not ignore the rubber at all.  If a tire was made of many other
materials it would not be a bouyant device.  Rail car wheels are an
example.  The fabric reinforcement and other stiffners in the carcass will
influence the contact patch, but cannot keep the tire from being bouyant.  

Try this: make a small puddle, drive your pickup through and observe the
wet contact patch produced.  Without changing the pressure, add 1000+
pounds to the bed and repeat.  If you like, add 10 or 15 psi to the loaded
rear tires and repeat.  You'll see that the contact patch increases with
more weight and decreases with more pressure.  This the bouyant behavior.  

For the same combination of *load* and *pressure*, any 2 tires will have
the same contact patch area.  Maybe I should have also emphasised area.  I
diliberately exclude run-flat tires like what comes on a Corvette; they
have so much steel, they don't flex and bend like a real tire.

John
'02 RS
Chattanooga

Original Message:
- -----------------
From: David W. Funk dwf@xxxxxxxxx
Date: Tue, 17 Dec 2002 16:15:13 -0800
To: ST@xxxxxxxxxxxxxx
Subject: RE: [ST] 190 on rear


The contact patch is greatly affect tire shape and construction.
To think of a tire as a "bouyant device" is to ignore the rubber.

David W. Funk
'00 Triumph Sprint ST
Pleasanton, CA

On Tue, 17 Dec 2002 15:23:47 -0800 (PST), Bryce wrote:

>I think he's referencing motorcycle tires....not
>flat/square drag slicks.
>
>Bryce
>
>--- Matt Knowles <matt@xxxxxxxxxxxxxxxxxxx> wrote:
>> >Tires are bouyant devices.  So, at the same
>> pressure and load, the contact
>> >patch will be the same for any 2 tires.
>> 
>> So your saying that if you inflated the front and
>> rear tires on a top 
>> fuel dragster with an equal pressure, and had an
>> even 50/50 weight 
>> distribution front and rear, that the two tires
>> would have an equal 
>> contact patch?
>




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