Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: Notesfiles $Revision: 1.7.0.8 $; site uiucdcsp
Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxn!ihnp4!inuxc!pur-ee!uiucdcsp!leimkuhl
From: leimkuhl@uiucdcsp.Uiuc.ARPA
Newsgroups: net.bicycle
Subject: Re: Tire Pressure, etc.....
Message-ID: <4200023@uiucdcsp>
Date: Mon, 16-Sep-85 22:23:00 EDT
Article-I.D.: uiucdcsp.4200023
Posted: Mon Sep 16 22:23:00 1985
Date-Received: Thu, 19-Sep-85 04:07:02 EDT
References: <5490003@acf4.UUCP>
Lines: 19
Nf-ID: #R:acf4.UUCP:-549000300:uiucdcsp:4200023:000:844
Nf-From: uiucdcsp.Uiuc.ARPA!leimkuhl    Sep 16 21:23:00 1985




I was using some of the new Turbo/Rs in a century last weekend and 
pumped them to about 110 (rating is 115 max).  After about two hours of
riding in the sun (hot that day!) the rear tire blew up.  The bead
was blown right off the rim.  The tube was punctured and the force of
escaping air blew the bead off.

Some friends of mine who routinely run their tubulars at 140+psi tell
me that if you can put 120psi into them, they hold 120psi, but I
follow the advice of Michelin's tire experts who say that the optimum
pressure is around 100psi for road racing.  Above that, rolling
resistance can actually increase as the tire ends up bouncing around
on minute debris instead of rolling over it, and higher pressure
can make the tires more flat-prone, too.  Also, those very high
pressures may be more than your rims can stand.

-Ben Leimkuhler


Brought to you by Super Global Mega Corp .com