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From: Radey Shouman <shouman@comcast.net>
Newsgroups: rec.bicycles.tech
Subject: Re: Dual-Chain drive train
Date: Mon, 30 Dec 2024 12:00:55 -0500
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zen cycle <funkmasterxx@hotmail.com> writes:

> On 12/29/2024 10:39 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
>>   
>  Third-world use by people with little to no technical ability. Their
>  bikes are heavily misused and abused, and generally speaking the
>  riders/owners have very few resources that could be applied to fixing
>  something that failed.. An external gear-changing system doesn't last
>  long in those environments.
 
Derailleur chains require frequent replacement due to wear.  Expense and
logistics would likely be a problem in the Buffalo application.
Non-derailleur chains can wear in with the cog and sprocket and last for
years without requiring replacement.