Retro-direct drivetrains were developed in the early years of multi-
speed bicycles as just another way to have multiple gears, around the
same time that IGH's and modern derailers were being developed and
before either of those were perfected enough to become ubiquitous.  I
suppose an advantage over the other two systems is that it doesn't
"shift" per se--both gears are always engaged--so there's fewer
movable parts to break.

On Nov 17, 11:03 am, Ron MH <visio...@gmail.com> wrote:
> I love that video - very clever.
>
> The question I have is "why?"
> What's the point of this type of drive train aside from its novelty?
>
> On Nov 17, 6:52 am, Mike <mjawn...@gmail.com> wrote:
>
> > Oh yeah, one more link:
>
> >http://www.bikeradar.com/news/article/back-pedalling-onion-man-attemp...

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