Sram x0 type 21 10 speed rear mechcage lock with cage lock technology in the rear derailleur wheel removal and installationas well as chain installationbecomes faster and simpler just pushing the cage forward to create slack and lock it into place exact actuation when we launched our road technology from scratch we reapplied our mtb proven sram 11 actuation ratio shifter cable travel derailleur movement for 10 speed rear shifting ea helps to simplifystabilize the uneasy act of bala