Re: Ashtabula cranks, was Re: [CR]1962 Chrome Superior photos


Example: Framebuilders:Rene Herse

From: BobHoveyGa@aol.com
Date: Wed, 4 Oct 2006 13:16:57 EDT
Subject: Re: Ashtabula cranks, was Re: [CR]1962 Chrome Superior photos
To: classicrendezvous@bikelist.org


In a message dated 10/4/06 1:29:24 AM, Kurt writes:


> >>I cannot see any reason why Ashtabula cranks need be significantly
> heavier
> than any other type. 
>

Since the crank has to slide thru the bottom bracket, I think most of the extra weight comes from the larger bottom bracket shell, as well as the larg er bearing cups.


> >>They will require a thin section for the left side arm
> which pretty much rules out Al alloy though.  A thin set in Ti could be
> both light and strong if perhaps excessively flexy for a masher.
>

The other problem with a one-piece alloy or Ti crank is figuring out how to get steel bearing races on the spindle.

Bob Hovey
Columbus, GA USA