Originally Posted by
Super.bee
Wow, non-toothed cogs? Was this common on the old 3-speed rear derailleurs? Did it function well?
These were quite common on pre 1970's derailleurs... Huret did not move to toothed pulley wheels until 1974.
This is the 1958 Huret Alvit - sold by the thousands and thousands and the first successful mass market parallelogram derailleur.
Huret Svelto - An economy model that works well over a narrow range cog.
Huret Jubilee... considered a grail item as it is one of the lightest derailleurs ever made with a toothed guide pulley.
There are many other examples of non toothed pulleys... this horrible little thing was made by Campagnolo and only has one jockey wheel.
Images courtesy of disraeli gears:
http://www.disraeligears.co.uk - this is a brilliant resource if you seek info on derailleurs.
The Cyclo Benelux Mark 7 that came with their 2 and three speed conversion kits... it was an older pull chain model that use a helical spring to provide lateral movement and had a toothed guide pulley and a nearly round tension pulley.
