Re: [CR] Was Velo-Mine polishing - Now crank arm breakage

(Example: Framebuilders:Brian Baylis)

Date: Thu, 1 Apr 2010 21:41:03 +0000 (UTC)
From: "damien roohr" <droohr@comcast.net>
To: John <torup@sbcglobal.net>
In-Reply-To: <0316FB71-8FE1-4923-B5CC-68759EF68E03@sbcglobal.net>
Cc: Classicrendezvous@bikelist.org
Subject: Re: [CR] Was Velo-Mine polishing - Now crank arm breakage


re - Buying refurbished parts where one does not know what they looked like before polishing, is something I would shy away from for a rider bike, but not polished parts as a type.

Very well said -- i completely agree! There is an old saying in the world of cars and car parts: "if it don't go chrome it!"

- the natural correlation to bike parts is that "if there are fatigue issues, polish it! "

Beware of shiny used stuff!

damien roohr'
canton, ct


----- Original Message -----
From: John
To: classicrendezvous@bikelist.org
Sent: Thursday, April 1, 2010 5:33:47 PM GMT -05:00 US/Canada Eastern
Subject: Re: [CR] Was Velo-Mine polishing - Now crank arm breakage


While Mike Kone's advice might be very cautious, way back in the day, the Campagnolo cranks that broke and came to the bike shop all showed "polishing" of the arms by either a toe strap or an ankle / heel. When we had the chance we addressed this by looking a cleat placement, pedal type and made suggestions, Pista pedals instead of Strada often helped, often customized in the shop area, adjusting the toe clip location too.

One rider had worn away 2+mm of material away from the arm from the ball of his foot. We got him on new arms before there was a asphalt moment.

There were other breakages, such as from a fellow who just HAD to grease the taper on the crank spindle and over-torqued, it failed on the stand.

There are ways to check for cracks, "crack check" dyes can help.

To the shop a rider who had to re-torque his cranks periodically was reason to see why, often there was a problem, mismatch of spindle type or grease again.

While this is possibly overblown, and someone doing their own work to their own parts is probably not a problem. Buying refurbished parts where one does not know what they looked like before polishing, is something I would shy away from for a rider bike, but not polished parts as a type.

John Jorgensen
Torrance Ca USA