[CR]Re: [Bulk] Re: Half-step on Sturmey

From: "cmontgomery" <cmontgomery15@cox.net>
To: "Mark Stonich" <mark@bikesmithdesign.com>, <classicrendezvous@bikelist.org>
References: <48CE3D89.9060804@verizon.net> <1262235490.20080915123431@rogers.com> <E1KfIj8-0004Zh-U3@elasmtp-spurfowl.atl.sa.earthlink.net>
Date: Wed, 17 Sep 2008 21:14:22 -0700
Subject: [CR]Re: [Bulk] Re: Half-step on Sturmey

BTW If you have an alloy shell you don't want very low gears on an FM unless you are a lightweight or a bit underpowered. The low gear pawls work in slots cut into the shell, unlike the AW/FW/S5 where are ramps in a continuous band. http://bikesmithdesign.com/SA/fm-fw-left-ball-cup.jpg A steel shell adequately supports these (for lack of a better word) crenellations. The old, thin, alloy shells flex enough that the pawls can bust these off http://bikesmithdesign.com/SA/fm-alloy-oops.jpg

I have a spare alloy FM shell, but I'll be sneaking FW guts into it.

Mark Stonich

That is exactly what happened to mine Mark. I cried for days. Are you shure you really need that extra FM shell? I understand that one can use an AW shell for FM guts with a certain alteration. Is this the case? What needs to be done?

Craig-down to an ASC, TF, FW, and AM- in Tucson