RE: [CR]Re:Track bikes-fractured dropouts-fractured frames

(Example: Production Builders:Tonard)

From: "Mark Petry" <mpetry@bainbridgeisland.net>
To: <rocklube@adnc.com>, <classicrendezvous@bikelist.org>
Subject: RE: [CR]Re:Track bikes-fractured dropouts-fractured frames
Date: Wed, 17 Jan 2001 08:43:35 -0800
In-Reply-To: <3A65BEA6.7DC1@adnc.com>


Just did the "finger test" on some of the bikes in my collection to confirm. The Wizard, Cinelli, and Singer all have smooth, square edges on the inside of the dropout. The Hetchins and Pogi both have flashing left over from the forging process.

Coincidence or evidence of meticulous workmanship?

================================================ Mark Petry 206.618.9642 Beautiful Bainbridge Island, WA ================================================ mailto:mpetry@bainbridgeisland.net ================================================ The difference between genius and stupidity is that genius has limits.

Albert Einstein, 1948

================================================ -----Original Message----- From: classicrendezvous-admin@bikelist.org [mailto:classicrendezvous-admin@bikelist.org]On Behalf Of Brian Baylis Sent: Wednesday, January 17, 2001 7:48 AM To: classicrendezvous@bikelist.org Subject: Re: [CR]Re:Track bikes-fractured dropouts-fractured frames

Richard,

Way back when all there was were Campagnolo dropouts, we were taught at Masi Carlsbad to file the inside of the triangle hole in the dropouts; making sure to get into the corners and square everthing up and remove the sometimes present small imperfections caused by the forging process. NO one ever told us why this was part of the proceedure, but years later I realized it is cheap insurance to help prevent dropout breakage. I have to assume there is some benifit to that little detail; because over 25 years of building frames, I've never had to replace a broken dropout on one of my frames, except in two cases of dropouts involved in crashes. There is no doubt that riding on a broken axel is the primary cause of broken dropouts, but there's no substitute for cheap insurance. I don't think this information will benifit too many framebuilders today, since most builders use cast plug-on dropouts these days.

Brian Baylis La Mesa, CA
>
> the campagnolo dropouts will break due the following
> explanation, owing to the fact that the wheels are
> riding on bent or broken axles. it is the axle problem
> which causes the dropout problem. it is not caused
> simply by using a spacer or spacers, or freewheels.
> keep up on your axle maintenance and the dropout
> will not break.
> e-RICHIE
>
> On Tue, 16 Jan 2001 21:43:03 -0500 tomwitkop@juno.com writes:
> >
> > Further divergence but perhaps helpful. I was recently at John
> > Hollands'
> > His theory is that the normal
> > freewheel style set up allowed for an extended spacer or spacers
> between
> > the right side lock nut end of the bearing. This extended axle would
> > continually flex while riding constantly massaging the dropout and
> > eventually and apparently, inexorably, leading to failure. The
> > theory seems reasonable to me.