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From: Roger Merriman <roger@sarlet.com>
Newsgroups: rec.bicycles.tech
Subject: Re: Dual-Chain drive train
Date: 30 Dec 2024 14:01:06 GMT
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AMuzi <am@yellowjersey.org> wrote:
> On 12/30/2024 6:11 AM, zen cycle wrote:
>> 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.
> 
> +1
> 

Yup seems a poor choice for derailleur!

Roger Merriman