Re: Dual-Chain drive train

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