That Cyclo derailer... for anyone who has never seen one.

It is a oil bath derailer that uses a cable and rod operated coil spring to move the cage to and fro... these were a common design back in the 50's and cyclo sold them in a kit with a double or triple cog to expand the gearing on an SA hub.

They came in models that could accommodate 3, 4, or 5 speed blocks whereas the JUY543 on my old Peugeot has an adjustable range and is a far nicer and yet, similar design.

Not my pic... mine needs some serious disassembly and cleaning up but all that oil covering it has preserved it very nicely.


http://imgs.inkfrog.com/pix/bbcbikes/cyclo_der__2_.JPG