The new sram xx1 eagle 12 speed rear derailleur not only answers the eagletrade drivetrainrsquos need for greater capacity but itrsquos also the next evolution of sram39s proven 1x specific x horizontrade design the larger 14 tooth x synctrade lower pulley allows 10 to 50 tooth cassette capacity in this relatively compact design and also adds to eaglersquos overall smooth pedaling feel a type 3 roller bearing clutchtra