Hi Marcus. In this case, a manufacturer would be brazing one item under the BB, as opposed to two on top. In my experience most bike makers don' t even do this, but instead drill and tread a small hole for a plastic gu ide to be screwed in.
The underside cable guide will also be easier and faster to paint the bike. This may seem trivial to us on the list who only paint one frame at a tim e, but for companies that produce bike frames by the tens of thousands, it really adds up.
(I know, off topic, but still of interest) Perhaps animated manufacturi ng plays a roll in this as well, since a modern bicycle designer now must consider the strengths and limitations of what robot bike builders can and can't do. I don't know much about this, so perhaps this should be left for another discussion.
Whichever way your cables are guided, we should all enjoy the ride.
Tom Harriman. San Francisco, Ca
To: transition202@hotmail.com Subject: RE: [CR]Dumb Question, BB cable guides From: marcus.e.helman@gm.com Date: Mon, 20 Oct 2008 09:56:31 -0400
Tom,
Thanks for the note. I'm not I get it, though. Lots of bikes have under BB guides brazed on, so I'm not sure how it saves any work
Best regards,
Marcus
Tom Harriman <transition202@hotmail.com>
10/20/2008 12:35 AM
To <marcus.e.helman@gm.com>, <classicrendezvous@bikelist.org>
cc
Subject RE: [CR]Dumb Question, BB cable guides
Hi Marcus. My guess would be the efficiency mass production. By running the cables under the BB, it's two less things that have to be brazed on to the frame, and it's going to be easie r and faster to paint that part of the bike. The bicycle industry is like all other businesses, it's always going to be looking for ways to cut cost and stay profitable.
Tom Harriman.
San Francisco, Ca
> To: classicrendezvous@bikelist.org
> From: marcus.e.helman@gm.com
> Date: Sun, 19 Oct 2008 22:59:23 -0400
> Subject: [CR]Dumb Question, BB cable guides
>
> Why did framebuilders start running cables under the bottom bracket?
It
> seems to offer no advantage. I have one bike with the cables run on
top
> of the BB, and one with the cables running underneath. There is no
> difference in shifting that I can tell. Maybe it's just esthetics.
> Personally, I prefer the more traditional top of BB treatment.
>
>
> Wondering,
> Marcus Helman
> Detroit, MI
>
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