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From: an@hou2h.UUCP (A.NGUYEN)
Newsgroups: net.auto
Subject: Re: The Measurement of Tire Pressures
Message-ID: <452@hou2h.UUCP>
Date: Mon, 14-May-84 16:59:58 EDT
Article-I.D.: hou2h.452
Posted: Mon May 14 16:59:58 1984
Date-Received: Wed, 16-May-84 07:13:49 EDT
References: <1466@sdccs6.UUCP>, <343@ihu1g.UUCP>
Organization: AT&T Bell Labs, Holmdel NJ
Lines: 18

--
> Bob Fishell (ihnp4!ihu1g!fish):
> .. I thought that tire pressure should always be measured hot,
> because that's what the tires are when you're rolling.

Tyre temperature (and hence pressure) when underway could vary a lot
depending on cold inflation pressure (underfinflated tyres flex more
and generate more heat), load, and driving style (four wheel drifts,
hard braking, etc), and other factors.  Therefore cold pressure is
always a more consistent baseline.

> The rule of thumb is to add 4 psi to a cold measurement to convert
> it to a "hot" measurement.

I figure 10 percent of cold pressure.

	Au