Re: [CR] Comment on the crank arm break please - Origin of Break

(Example: Framebuilders:Cecil Behringer)

To: <classicrendezvous@bikelist.org>
Date: Tue, 26 Jan 2010 14:26:04 -0800
From: donald gillies <gillies@ece.ubc.ca>
Subject: Re: [CR] Comment on the crank arm break please - Origin of Break


The crack appears to have originated in the most common pedal-rub area of the crank, an area that is abraded by the foot and/or toe strap on every pedal revolution.

I have a few uninstalled campy-pattern cranks in my garage, and this suggests that maybe I should perform a dye-penetrant test (with e.g. food coloring) on my cranks before I bother to mount them on the bike. Other CR members with used and brittle 7075 cranks might want to do likewise.

- Don Gillies
San Diego, CA, USA