The sram nx 11 speed rear derailleur provides the same smooth reliable shifting action as xx1mdashfrom the larger upper pulley offset to the 12 tooth x synctrade pulley wheels by eliminating unwanted chain movement x horizontrade shifts faster puts an end to ghost shifting and reduces shift force and chain slap and with cage locktrade technology wheel removal and installation are easier than ever sram nx 11 speed rear derailleur features x horizon design that reduces s