Re: [CR] KOF Sturmey-Archer


Example: Framebuilders

Date: Sat, 7 Feb 2009 09:06:54 -0600
To: <classicrendezvous@bikelist.org>
From: Mark Stonich <mark@bikesmithdesign.com>
In-Reply-To: <742C3F63638649118BF97E9DC55503E4@H10N7>
References: <742C3F63638649118BF97E9DC55503E4@H10N7>
Subject: Re: [CR] KOF Sturmey-Archer


At 2/6/2009 06:14 PM -0800, Scott Minneman wrote:
>Yesterday's picture shows how, in addition to the Shimano splines for cogs,
>one can mount a single-speed freewheel on the hub (which seems like an
>"unclear-on-the-concept" choice to me).

Some days you feel like riding fixed, some days not. Perhaps it's to offer an option for those who don't want to have two 3 speed rear wheels. The ultimate option would be a slide-on FW with a locking lever that you would have to dismount to operate. (So you couldn't accidentally shift into fixed while coasting.)
>The ratios on the new one are quite different than the original. The old
>ASC was .75, .90, and direct. The new S3X is .625, .75, and direct.

At first this seemed quite odd to me too. But I see SA are recommending, and showing in their illustrations, 13t cogs. I haven't found it on SA's site, but I've seen posters on other lists mention a 3:1 lower limit for chainring/cog ratios. 81 gear inches seems a bit much.

Could it be that they expect you to use 2nd for most of your riding, with top gear reserved for downhills? I haven't ridden fixed in years, but still have vivid memories of letting speed get out of hand on a steep hill.

Most of my bikes have SA hubs. While my brain knows that any gear other than direct is less efficient, my legs can't tell the difference.

At 2/6/2009 09:50 PM -0500, Marcus Coles wrote:
>and add an oil filler cap.

Amen!

BTW I've read rumors that SRAM is going to introduce a shiftable fixed/free SS hub.

Mark Stonich;
     BikeSmith Design & Fabrication
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