Re: [CR]Cottered Crank Safety


To: lenoremeyer@hotmail.com
Cc: Classicrendezvous@bikelist.org
Date: Mon, 9 Jul 2001 22:21:52 -0400
Subject: Re: [CR]Cottered Crank Safety
From: tomwitkop@juno.com


I believe that before the 1970s, track racers used only cottered cranks because they were considered stronger and less likely to fracture then Cotter less cranks. I imagine this is because cottered cranks are built of steel which is probably stronger and certainly more forgiving than aluminum. I am not aware of any aluminum Cotter less cranks (I do not believe that the TA semi cottered cranks really counts as a cottered crank). Consequently, I believe that cottered cranks are safer than Cotter less cranks. This is my opinion only, it is not based on statistics or anecdotal evidence, just my recollection of some distant history. Thomas Witkop Rockville, Maryland On Mon, 09 Jul 2001 16:52:50 -0700 "Meyer Lenore" <lenoremeyer@hotmail.com> writes:
> There was a thread a short time ago on cranks rupturing. I do a fair
> bit of
> riding on some vintage British cottered cranks and I'd like to know
> if there
> are any safety issues in using them.
>
> Are cottered cranks inherently weaker or stronger than cottered
> cranks?
>
> Does the fact that some I ride on are 50 years old pose a problem?

>

>

> M