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From: zen cycle <funkmasterxx@hotmail.com>
Newsgroups: rec.bicycles.tech
Subject: Re: Dual-Chain drive train
Date: Sat, 28 Dec 2024 13:05:18 -0500
Organization: A noiseless patient Spider
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On 12/27/2024 2:11 PM, AMuzi wrote:
> On 12/27/2024 12:32 PM, Frank Krygowski wrote:
>> On 12/27/2024 10:35 AM, Zen Cycle 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.
>>>
>>> It appears to engage one drive train or the other through a back- 
>>> pedaling action, forcing the pawls in the freewheel to toggle from 
>>> one side to the other.
>>>
>>> It's been tested for over two years in the field with great feedback 
>>> (according to the article) and is now being marketed in 3rd world 
>>> countries.
>>>
>>> The design won the Eurobike Gold award in 2024 for "excellence in 
>>> design and innovation within the cycling industry"
>>>
>>> More information at https://worldbicyclerelief.org/s2/
>>
>> Thanks, that's more info than I was previously able to find.
>>
>> ISTR a 1960s hub gear with coaster brake that also shifted gears when 
>> backpedaled slightly. I never had a chance to ride one.
>>
> 
> Many similar.  Cheap and effective, famously robust too. I made that 
> comment the first time we discussed double ($$) drive chains on that 
> vehicle.
> 
> The original 1950s Bendix two speed had a cable to change gears. In 1960 
> it was replaced with the three 'automatic' versions whose mechanism is 
> directly analogous to a Parker ball point in-out mechanism.
> 
> https://www.youtube.com/watch?v=MhVw-MHGv4s
> 
> [nice clear graphics]
> 
> Fichtel & Sachs (later SRAM) made a very nice automatic unit as well and 
> there are smaller volume eastern European variants too.
> 
> Two of the Bendix 2-speed CB designs are currently produced under the 
> Eagle [SOMA] brand.
> 
> https://www.bicycleretailer.com/product-tech/2021/03/17/merry-sales- 
> helps-bring-back-eagle-2-speed-coaster-brake-hub
> 

Can you think of any reason why those versions haven't made their way 
into this application? Serious question....