Joe Bender-Zanoni wrote:
>
> 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.
Joe, I have to differ with your pronouncement of my pronouncement:
The discussion was about indexing gear in the Tour de France. The Osgear Super Champion was the first derailleur to be used in the Tour de France (1937), and it indexed. It used a four cog freewheel.
The two cog freewheels were mentioned as being used without derailleurs in the Tour de France previous to 1937. They were one tooth apart.
Your example of a Cyclo 17, 21 two cog freewheel has nothing to do with the discussion at hand.
You suggest that I "should have held (my) tongue in the abscence (sic) of actual knowledge" Wow! I guess I would suggest the same...
Chuck "my, my, my" Schmidt L.A.
.