Captain Dondo wrote in message ...
Werehatrack wrote:

As noted, if there's no freewheel, within a few minutes there will be
no rear derailleur either. I suppose that someone with the requisite
machine tools and skills could create the world's most nukeproof rear
der to solve this particular problem, but I'm not sure I want to think
about the cost and/or weight.

Didn't one of the earliest shifting systems involve reaching back and
opening the QR, then using a fork sort of thing to push the chain on to
the next cog?

Wouldn't this work on a fixie? (My interest is purely theoretical, I
have no desire to actually try this, mind you.

-Dondo

(realizing that i've never rode one) i think that you got to coast
briefly during an upshift to allow the cogset & wheel to move backward
to suck up the chain slack.

....and at the prices the Cambio Corsa command, probable never will.