Re: [CR]Re: Replacing Aluminum handlebars

(Example: Framebuilders:Dario Pegoretti)

From: "jerrymoos" <jerrymoos@sbcglobal.net>
To: <Cino1947@aol.com>, <classicrendezvous@bikelist.org>
References: <105.38391d01.2cc9d9a3@aol.com>
Subject: Re: [CR]Re: Replacing Aluminum handlebars
Date: Thu, 23 Oct 2003 20:39:57 -0500


I haven't broken one in in use, but I got some AVA bars on a used PX-10 a few years ago. Noticed one side dropped away from the stem more rapidly than the other. I untapped the bars and found a hairline crack running along the curve from near the stem almost to the end of the bar. I kept that pair to remind me to inspect AVA bars regularly.

Regards,

Jerry Moos
Houston, TX


----- Original Message -----
From: Cino1947@aol.com
To: classicrendezvous@bikelist.org
Sent: Thursday, October 23, 2003 8:25 PM
Subject: [CR]Re: Replacing Aluminum handlebars



> The old French AVA bars and stems have gotten bad rap in the past. Has anyone
> had experience with them breaking?
> Josh Berger
> Bronx, NY
> In a message dated 10/23/2003 7:38:26 PM Eastern Daylight Time,
> classicrendezvous-request@bikelist.org writes:
> Date: Thu, 23 Oct 2003 16:07:17 -0400
> From: Joe Bender-Zanoni <joebz@optonline.net>
> To: Grant McLean <Grant.McLean@SportingLife.ca>,
> <classicrendezvous@bikelist.org>
> Subject: Re: [CR]Replacing Aluminum Handlebars
> Message-ID: <01cc01c399a1$4272a5a0$6400a8c0@jfbender>
> References: <D40031E5F7ACD71195BC009027887CFF11871B@SLSERVER>
> Content-Type: text/plain; charset=iso-8859-1
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>
> Aluminium fatigues based on the number of cycles and loads. The fatigue
> failure starts as a microcrack, then fairly rapid crack growth proceeds.
> Therefore the commonplace warning to inspect for cracks on old aluminium
> parts.
>
> The parts are not "weaker" after use. If cracks have not initiated the parts
> will test just as strong at year ten as new.
>
> If an alumium alloy is very hard like a 7075-T6 component it can crack
> through rather quickly. So typically high strength alloys can fail more
> suddenly when they do go.
>
> Joe Bender-Zanoni
> Great Notch, NJ
>
>
>
>
>
> ----- Original Message -----
> From: "Grant McLean" <Grant.McLean@SportingLife.ca>
> To: "Classic Rendezvous Mail List (E-mail)" <classicrendezvous@bikelist.org>
> Sent: Thursday, October 23, 2003 3:40 PM
> Subject: [CR]Replacing Aluminum Handlebars
>
>
> > *famous* Lou,
> >
> > I too read that and scratched my head.
> >
> > And one can only imagine that a super-conservative company like nitto
> > would make bars that last longer than many others.
> >
> > Recently, our shop has seen a rash of modern cinelli bars opening like a
> > can-o-beans (at the stem) after only a few months! (yikes)
> >
> > Grant McLean
> > Toronto.Ca
> >
> > O \O/
> > _< \_ _< _
> > (_)>(_) (_)>(_)
> >
> > In the latest Rivendell Reader, #30 (I'm sure you are all subscribers,
> > right?), Page 14, in an interview with the President of Nitto, the
> > question is asked about whether aluminum handlebars should be replaced
> > every five years, even if they have not been crashed. The answer says
> > that if you have an aluminum handlebar that is ten years old and never
> > used, that it will be "significantly" (quotation marks added by me) weaker
> > than when it was new. Anybody know why this would be? It doesn't make
> > sense to me, but then, I'm no metallurgist, just a rocket
> > scientist.......Lou Deeter, Orlando FL