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From: Catrike Ryder <Soloman@old.bikers.org>
Newsgroups: rec.bicycles.tech
Subject: Re: Dual-Chain drive train
Date: Sun, 29 Dec 2024 15:14:22 -0500
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On Sun, 29 Dec 2024 12:04:34 -0600, AMuzi <am@yellowjersey.org> wrote:

>On 12/29/2024 9:39 AM, bp@www.zefox.net wrote:
>> Zen Cycle <funkmaster@hotmail.com> wrote:
>>> https://www.bikeradar.com/news/buffalo-utility-s2
>>>
>>> Made for developing countries to allow for easier transportation on
>>> cargo bikes, without the exposure and complexity of an external
>>> derailleur or hand-operated shifting (for an internally geared hub). It
>>> was developed and patented with the help of SRAM.
>> 
>> Are derailleurs really that bad? A whole new bike for the sake of a granny
>> gear seems slightly extreme. Internal pawls at small radius are going to
>> be more stressed  and harder to build than a rear sprocket of larger radius.
>> 
>> I'll admit that the narrower flange of a multispeed rear hub impairs the
>> lateral strength of the rear wheel, but a hub with flanges spaced to leave
>> room for a two-cog stack would be vastly stronger. What is the "exposure"
>> alluded to above?
>> 
>> Thanks for reading,
>> 
>> bob prohaska
>
>
>>" Are derailleurs really that bad?"
>
>Yes.
>
>They last a long while for many competitive events (except 
>criteriums where concrete abrades right through them). 
>Derailleurs are the overwhelming choice for tourists, even 
>of great distances, on roads whether paved or not. 
>Derailleurs are also usually suitable to commuters although 
>in salted areas that vulnerability is a factor.  Offroad is 
>sorta sketchy in that failures are regular but alternates 
>have some serious tradeoffs so the derailleurs just get bent 
>back or replaced.
>
>[note most offroad is recreation, by riders who can well 
>afford replacement gear. Among the MTB riders, "I broke that 
>too!" is not always a complaint, it's often a boast.]
>
>Extreme use, where unsupported durability is critical, would 
>lead one to a not-derailleur design of some type.

I've long marvelled at the rear deraileur mechanisms and how well they
function when properly set up. I've never had one fail, but I did
replace one a few years back because the idler sprokets were worn
down. Now, granted, I don't go offroad, and I can see potenial
problems there.

--
C'est bon
Soloman