Re: [CR] cottered alloy cranks

Example: Framebuilding:Brazing Technique
From: "David Feldman" <>
To: "Mark Bulgier" <>, <>
References: <>
Subject: Re: [CR] cottered alloy cranks
Date: Sat, 21 Dec 2002 17:18:43 -0600

Phil Wood has and still will make bb's with the pear-shaped spindle for those cranks--talk about taking care of a niche market!
David Feldman
Vancouver, WA

----- Original Message -----
From: Mark Bulgier
Sent: Saturday, December 21, 2002 3:27 PM
Subject: RE: [CR] cottered alloy cranks

> Stevan Thomas wrote
> (re cottered alloy cranks)
> > I believe T.A. made a set like that.
> The TA 1500 is often called a cottered crank and I don't mind that
> terminology, but it should be pointed out that they are fundamentally
> different from cottered cranks in that the "cotter" (really a pinch bolt)
> doesn't take any of the pedaling forces. The unique pie-shaped axle-crank
> interface is pretty much rideable with the cotters out, except the arms can
> drift side-to-side.
> The precision of the fit between the axle and crank is amazing - this must
> be one reason they stopped making them; it can't be easy to maintain such
> tolerances. Any cottered crank is quite crude by comparison. Loosen one
> allen-head bolt and the crank slides off! You don't have to take the cotter
> all the way out, just loosen it, if you file a little catch off the end of
> the axle as I did on mine. (The catch would keep the crank from falling off
> if the bolt were loose, but it would have to drift so far before it fell off
> that you would notice it in time unless you were very oblivious - and these
> bolts don't loosen up.)
> For pictures and good explanations check out Joel Metz's site,


> Mark Bulgier

> Seattle, Wa