On Sat, 23 Nov 2002, Jinx wrote:

*>> Apparently there is a french company called Mavic Mektronic that
*>> makes an electronic gear change system for bikes with Derailleur
*>> type gears. Uses a push button on each handle bar, one for up, one
*>> for down shift - F1 paddle change style
*>
*>I'd heard about something on the market but hadn't looked into
*>it too seriously, thanks for the link. I reckoned a couple of steppers
*>with worm gears could do it, kind of like machine heads on a guitar,
*>there's not that much tension in the wires

Last time I used a bicycle and tinkered with the derailleur gear mechanism
I found out the hard way that the wire tension is 3-4kgf-ish.

The force required for the torpedo-style (in-hub) gear changers is much
lower, but with 2kgf peaks and some continuous tension.

Peter

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