[CR]Simplex part - what is it?

(Example: Framebuilders:Brian Baylis)

From: <velorosso@charter.net>
To: <classicrendezvous@bikelist.org>
Date: Sun, 25 Sep 2005 11:12:36 -0700
Subject: [CR]Simplex part - what is it?

Hello Lister's! Got several parts that seem to be chain tensioners with Simplex jockey wheels. Here's pictures:


Not sure how they mount, or what the application is. If you mount it in a derailleur hanger, the jockey wheel will be too far outboard to line up with a cog. Anyone know how this is used?

John Siemsen San Luis Obispo, CA