There were types with weights on the rear wheel as well. The free-wheel was
in the bottom bracket so that it would shift for you even if you were
coasting. Interesting idea but people who ride bikes often enough to
purchase them are usually more interested in reliability and weight.
--
Martin

On 2/23/07, Walter Banks <walter@bytecraft.com> wrote:
>
> They worked quite well when they did. Too many adjustments.
> Modern high tolerance manufacturing would have made quite
> a difference. They were a little weird to ride. They changed
> the way you rode any hard acceleration wound up downshifting.
>
>
>
> w..
>
> Tony Smith wrote:
>
> >
> > Years & years ago, you could get bicycles with automatic gear changes
> > (derailleur type).  It worked on the tension of the the chain, high
> tension
> > means it shifted down, low tension shifted up.
> >
> > I've no idea how it actually worked, but I guess 'not very well' as it
> has
> > vanished.
>
>
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-- 
Martin Klingensmith
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist