Comprised mainly of a mechanical structure, the movement of the derailleur is via an electronically-actuated worm gear and motor with resolver sensor The parallelogram has been made more rigid and optimized to accommodate the electronics A resolver reads the movement of the derailleur and optimizes its position, and a play recovery system that maintains stability over time and many kilometers Mechanical limit adjustment screws and end stop are included, just like a normal derailleur Can be shifted over the entire range of 11 cogs in 1.5 seconds Has both a Zero and riding setting; requires being set on two sprockets during setup Comprised mainly of a mechanical structure, the movement of the derailleur is via an electronically- The parallelogram has been made more rigid and optimized to accommodate the electronics A resolver reads the movement of the derailleur and optimizes its position, and a play recovery syst Mechanical limit adjustment screws and end stop are included, just like a normal derailleur Can be shifted over the entire range of 11 cogs in 1.5 seconds