rear derailleur nxThe SRAM NX X HORIZON rear derailleur provides the same smooth, reliable shifting action as XX1from the larger upper pulley offset to the 12 tooth X SYNC pulley wheels. By eliminating unwanted chain movement, X HORIZON shifts faster, puts an end to ghost shifting and reduces shift force and chain slap. And with CAGE LOCK technology, wheel removal and installation are easier than ever. Speed (RD): 11s Cable pull Ratio: X actuation Cage (RD): Long Max