Originally Posted by randyjawa

There is a very good chance that you will see this, sooner or later, on a Dupont Plastic Simplex derailleur, the front one being the worst culprit...



Get ride of the Simplex and replace with Suntour! That will solve the transmission problem. However, there are other Problems Associated with French Bicycles. Good idea to understand those and keep them in mind before you make a decision.