Re: [CR] (no subject)

(Example: Racing:Jean Robic)

Date: Thu, 1 Apr 2010 22:43:36 +0000 (UTC)
From: "damien roohr" <droohr@comcast.net>
To: kenneth denny <kendenny55@yahoo.com>
In-Reply-To: <879541.3797.qm@web30108.mail.mud.yahoo.com>
Cc: classicrendezvous@bikelist.org
Subject: Re: [CR] (no subject)


I am no engineer, but apart form the cool drillium components (now, why didn't that trend continue??), I for one would steer clear of any vintage part whose specs along any dimension had been tinkered with by some amateur engineer. I have been in races where a guy snaps a crank arm - another snaps a rear axle.. Just glad most of the time, up here in the NE, in the 80's - 90's most of the field was more concerned with leg power than attempting to out-think a professional metallurgical engineer. But that's just me.


----- Original Message -----
From: kenneth denny
To: torup@sbcglobal.net, droohr@comcast.net
Sent: Thursday, April 1, 2010 6:17:52 PM GMT -05:00 US/Canada Eastern


Bullshit! If you guys don't have the skill to examine a used bike part, shiney, anodized, polished, new or used, then you are in the wrong sport.

Back in the day, if we didn't show up to a race with extreme war paint on our bikes (ie., stripped of anodizing, polished, milled, drilled, shaved, and tuned), then we lost the fashion aspect of the race, ie. psychological competitive advantage.

It was vogue to tune virtually every part of a racing lightweight, including cranks, pedals, calipers, levers, bar/stem, even rims.

To say "buyer beware" sheds a dark light on one of the coolest aspects of lightweight racing bikes - tuning and polishing.

Everything else, ie. "off the shelf", is boring, IMO. Best Regards from Boston, Ken


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Archive-URL: http://search.bikelist.org/getmsg.asp?Filename=classicrendezvous.11004.0032.eml Date: Thu, 1 Apr 2010 21:41:03 +0000 (UTC) From: damien roohr <droohr(AT)comcast.net> 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 <"torup sbcglobal.net">
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