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From: joel@peora.UUCP (Joel Upchurch)
Newsgroups: net.auto
Subject: Re: tire inflation pressures
Message-ID: <1355@peora.UUCP>
Date: Mon, 22-Jul-85 11:57:36 EDT
Article-I.D.: peora.1355
Posted: Mon Jul 22 11:57:36 1985
Date-Received: Thu, 25-Jul-85 05:22:28 EDT
References: <32@zeus.UUCP> <1412@uw-beaver>
Organization: Perkin-Elmer SDC, Orlando, Fl.
Lines: 17

>back on.  Some rims are held on with lots of bolts and "dogs" while others
>fit together like a puzzle under a shorter rim that the tire can fit over.
>The air pressure in the tire serves to lock the pieces together and to the
>wheel.  When you inflate a truck tire for the first time there is a danger
>that the latter type of rim will not lock properly and and will be blown
>off.  This throws several pounds of steel pieces outward at several hundred
>feet per second.  This can occur with just normal inflation pressures (75
>lbs/in^2 and more).  Because of this danger it is standard procedure in
>truck shops to put the wheel and tire in a cage that will contain the
>shrapnel if the rim blows when the tire is first inflated.  The guy that got
>killed in Seattle was taking a shortcut and was not using a cage.

	Also if there is metal fatigue in the rim it may explode just
	sitting there. There was a segment on 20/20 or 60 mintues a
	while back about these locking rims and there we some people
	killed when the rim in a truck near them exploded and came in
	through their window.