Shimano XT RD M8050GS Di2 11 Speed Rear Derailleur Apparel_men;s cycling tights quick and secure closure Inspired by the characteristics quick and secure closure Center locking rotor interface *Instant response*Single lever operation*Rider programmable shift mapping*Accurate and stable shifting in any condition*Customized shift speed within Multi shift*Smart and efficient gear selection with SHIMANO Synchro Shift*Seamless gear change even under high load*Powerful shifting CAGE LENGTH GS Medium TOTAL CAPACITY 35T MAX FRONT DIFFERENCE 10 COLOR SERIES COLOR AVERAGE WEIGHT 319g MOUNT Direct attachment (conventional) Direct mount compatible GUIDE PULLEY BEARING Sealed Bearing TENSION PULLEY BEARING Sealed Bearing NUMBER OF PULLEY TEETH 11 SERIES Deore XT Di2 GENERATION Di2 M8050 MAX LOW SPROCKET 42T(2x11 speed)