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From: Frank Krygowski <frkrygow@sbcglobal.net>
Newsgroups: rec.bicycles.tech
Subject: Re: cleaning the commute bike
Date: Mon, 20 Jan 2025 11:43:18 -0500
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On 1/20/2025 11:15 AM, Wolfgang Strobl wrote:
>  
> <https://en.wikipedia.org/wiki/Diamond_frame>
> 
> The cable routing for the rear derailleur is usually like this: The
> cable is routed open along the down tube on its underside and from the
> cable guide under the bottom bracket further to the end of the chain
> stay. So there are only two short cable housings, from the shifter to
> the headset or top of down tube and then from the end of the chainstay
> to the rear derailleur.

FWIW, the worst of these problems I ever had was with my first mountain 
bike. To turn the front shift cable upwards from the down tube to behind 
the seat tube, it had a short (maybe 6") of cable housing. Both ends of 
that housing pointed upward, and inhaled water and mud. I did ride the 
woods in winter back in those days, and the moisture in the housing 
would freeze, locking up front shifting.

The open metal channel guides atop the bottom bracket gave the least 
trouble IME. Plastic guides under the bottom bracket need occasional 
cleaning and lube, but were also far better than housing.

-- 
- Frank Krygowski