I am not sure that I completely understand what this patent is about. I must read it more carefully!

I suspect it covers a number of different systems that automatically select the best combination of front chainring and rear sprocket and move the derailleurs accordingly. As such it may be an attempt to offer a road-specific response to the EGS Synchro Shift twist grip for mountain bikes.

With a priority date of 2003, this patent comes some years after the release of the MAVIC Mektronic.

• Publisher: L’Institut national de la propriété industrielle
• Inventor: Jean Pierre Mercat and Franck Dumontier
• Country: France
• Date: Priority date February 2003
• Derailleur brands: MAVIC
• Derailleurs: unknown