[CR] RE: Ashtabula Cranks

(Example: Framebuilders:Norman Taylor)

Content-class: urn:content-classes:message
Subject: [CR] RE: Ashtabula Cranks
Date: Thu, 5 Oct 2006 11:25:35 -0700
Thread-Topic: [CR] RE: Ashtabula Cranks
Thread-Index: Acboq6YVlMTko2YmT/igRZBUXJkrww==
From: "KO Kevin" <kko@ci.springfield.or.us>
To: "Classic Rendezvous" <classicrendezvous@bikelist.org>


> BobHoveyGa(AT)aol.com wrote:
>
>> The other problem with a one-piece alloy or Ti crank is figuring
>> out how to
>> get steel bearing races on the spindle.

Ashtabula cranks have races that thread on to the "spindle" after the arms are directed through the BB. They are opposite of standard BBs in that the bearing cups are on the inside and the races are on the outside. So, steel cups and races could be used on arms made from any material. If I recall, in the early BMX days, there were some pretty fancy one-piece crank arms that featured hollow cro-mo arms welded to the spindle. The racers our shop sponsored back then favored these over the alloy three-piece BB setup because they would trash the alloy square-taper arms in no time at all.

Kevin Ko
Eugene, OR