Chuck, I have to differ with your pronouncement that two speed derailleur shifting was not used. Based on your opinion the 17-21 two speed Cyclo freewheel I have shouldn't exist. That's not a one tooth difference as you cite for manual changes. And the teeth are profiled with an offset bevel on the outside of each tooth to improve shifting with a derailleur. An asymmetrical tooth profile wpuld make no sense for a manually changed setup.
And even though my comment was something of a joke, the use of a two-speed setup is so obvious that you should have held your tongue in the abscence of actual knowledge. Short of being all knowing, proving something doesn't exist is rather tough.
JoeBender-Zanoni
Great Notch, NJ
> Joe Bender-Zanoni wrote:
> >
> > 2 speed freewheels index great.(cut)
>
> The two 2 speed freewheels, one mounted on each side of the hub, were
> not used with a derailleur. You got off the bike, loosened the
> wingnuts, moved the chain with your fingers (or flipped the wheel around
> for the other two gears), and retightened the wingnuts and then got back
> on the bike. The cogs were one tooth apart because of the limitation of
> the length of the dropout and taking up the chain slack.
>
> The Vittoria Margherita shifted a three or four speed freewheel. Same
> with the Osgear Super Champion.
>
> Chuck Schmidt
> L.A.
>
> .