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From: levy@ttrdc.UUCP (Daniel R. Levy)
Newsgroups: net.auto,net.auto.tech,net.physics
Subject: auto tire pressures
Message-ID: <485@ttrdc.UUCP>
Date: Wed, 16-Oct-85 20:28:05 EDT
Article-I.D.: ttrdc.485
Posted: Wed Oct 16 20:28:05 1985
Date-Received: Fri, 18-Oct-85 00:47:22 EDT
Organization: AT&T, Computer Systems Division, Skokie, IL
Lines: 21
Xref: watmath net.auto:8488 net.auto.tech:28 net.physics:3369

I have a question and am open to speculation, theory, etc. concerning this.
Namely, how is the pressure inside an inflated auto tire affected (if at
all) by putting the car's weight on it?  I seem to notice a little bit of
difference between the pressure measured in a tire when it is on a loose
wheel and the pressure measured in the same tire when it has been mounted
on the car, but that could be measurement error.  Something is supporting
the quarter ton or so of force against the contact patch of the tire which
is not exactly a large area either--it's obviously not all air pressure that
is supporting it, yet you know that if you let out the air, the wheel will
come to rest against the ground with the tire squished beneath it, so the
air pressure is supporting SOMETHING, which is perhaps somehow proportional to
the weight on the tire (???).  So anybody who knows about this, especially
who could relate the theory behind this, please either post or send me mail
(I will summarize to net if warranted).  Thank you.
-- 
 -------------------------------    Disclaimer:  The views contained herein are
|       dan levy | yvel nad      |  my own and are not at all those of my em-
|         an engihacker @        |  ployer or the administrator of any computer
| at&t computer systems division |  upon which I may hack.
|        skokie, illinois        |
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