The Simplex Tour de France rear derailleur hanger tab is
of a very specific form that will not interchange with
others . It should have an outward jog which allows
space for the primary top tensioning spring to
reside .The chain tension is done by the pulley at the
end of the piston . The pulley swinging with the cage is
set up to give some tension of the chain into the
cluster. Refer to The Dancing Chain or one of Chuck's
Simplex reprints . Enjoy , Seth Finkelstein of Santa
Cruz CA
>
> I have a question for all you brainiacs.
>
> I have a Simplex Tour de France 5 speed rear der that has a der hanger
> attached to it. This would be useful for bikes that don't have an
> integral hanger on the dropout.
>
> Can this be removed so that the der can be used on a high quality bike
> that has an integral hanger? I know for instance that Huret Jubilee
> ders are NOT interchangeable without a small adapter plate.
>
> John Barron
> Minneapolis