Re: [Bulk] Re: Half-step on Sturmey, was [CR]How to build up this Hetchins?

(Example: Humor)

Date: Mon, 15 Sep 2008 12:34:31 -0400
From: "Dmitry Yaitskov" <dima@rogers.com>
To: Harvey Sachs <hmsachs@verizon.net>
Subject: Re: [Bulk] Re: Half-step on Sturmey, was [CR]How to build up this Hetchins?
In-Reply-To: <48CE3D89.9060804@verizon.net>
References: <48CE3D89.9060804@verizon.net>
cc: Classic Rendezvous <classicrendezvous@bikelist.org>
cc: Classic Rendezvous

Hi,

Monday, September 15, 2008, 6:48:41 AM, Harvey Sachs wrote:

<snip>
> Wes's comment piqued my interest, so I checked the old Sturmey manual.
> Wes nailed it for the more common "FW" or wide-geared S/A 4-speed, since
> 18/16 ~ 1.12, or 12% step-up. The FW has increase from 3 (normal, with
> 1:1 ratio) to top of 26.6%, and step-downs of -21.1% and -33.3%.
> Of course, for the Club Rider with the rare "FM" medium range model, one
> might prefer something like a 17/16 or the rare 15/14, since the FM
> gears were 12.5% up, and -14.3% and -33%. So even there, the Cyclo would
> give a useful additional bottom gear, but just be replicative above that.

As I noted in my other post (but forgot to mention in the original one), this bike has the "FM" model, with 19/22 sprockets combo, and a 44t chainring, which, if my math is right, gives 2 almost duplicate gears, and is too low overall. Advice on how to make the gearing more useful will be very much appreciated.

--
Cheers,
Dmitry Yaitskov,
Toronto, Canada.