[CR] Sachs 7-speed Freewheel cog naming convention

Date: Mon, 10 Aug 2009 20:02:54 -0700
From: Chris Collins <chris@eorbit.net>
To: <classicrendezvous@bikelist.org>
References: <20060213151855.A22789@eorbit.net> <20090718003156.GA12300@eorbit.net>
In-Reply-To: <20090718003156.GA12300@eorbit.net>
Subject: [CR] Sachs 7-speed Freewheel cog naming convention

Hello,

I have a custom 7-speed Sachs freewheel.

I know the different cogs have different identifying numbers.

Is the middle cog on a seven speed called an "RY", so a twenty-tooth middle is an RY-20?

There is SY, SX, and others. What is the middle specifically and what is the general sequence used for these?

--
Chris Collins
Oakland, CA
http://ccplanet.blogspot.com
http://twitter.com/chris_in_cal