Features of the Shimano XTR Down Swing Front Derailleur Di2 More powerful shifting (+25% compAred to M9000) Shimano Synchronized Shift compatible Reliable gear changes under load Manual control avaiable (2nd shifter required) Computer controlled auto trim System communication with rear derailleur Optimized Di2 cage profile and gear tracking Advantage in all conditions Modular mounting structure (adapters optonal) Series - XTR Generation - XTR Di2 M9050 Total Capacity - 18T Mount - Need SM-FD905