Re: [CR]the odds on tandem transfer cog tooth count

(Example: Framebuilders:Norman Taylor)

Date: Wed, 09 Apr 2003 13:56:55 +1200
From: "David Benson" <david@worrall.co.nz>
To: HM & SS Sachs <sachs@erols.com>
Subject: Re: [CR]the odds on tandem transfer cog tooth count
References: <3E93731E.90702@erols.com>
cc: Classicrendezvous@bikelist.org
cc: Classicrendezvous@bikelist.org

HM & SS Sachs wrote:
> Whoa! Mark, I'm going to take the bait. In a series of miserable,
> unplanned, empirical experiments involving an on-topic Schwinn
> Town-and-Country and transfer cogs ordered from R.E.W. Reynolds in
> England, I was forced to confront the fact that tandem eccentric
> bottom brackets can only take up a limited amount of chain. The exact
> length of the "boob tube" (bottom bracket connector tube) on that bike
> was such that it absolutely required even numbers of teeth on the
> transfer cogs. With a slightly shorter boob tube, I suspect that only
> odd tooth numbers would work. Evens worked fine on the T&C, and
> allowed use of the eccentric to take up slack as the chain wore. Odd
> tooth rings could only be set up as too-loose, or won't-stretch-to-fit.

So DB asks:

Harvey, Did you try putting a half link in the chain?

DB
Auckland, NZ