SRAM NX Type 2.1 1x11 Rear Derailleur Fully compatible with all SRAM MTB 1x drivetrains, the NX Type 2.1 Rear Derailleur makes SRAM 1x11 shifting more affordable. Why you want SRAM 1x11 - the blog . 'The SRAM NX X-HORIZONT rear derailleur provides the same smooth, reliable shifting action as XX1-from the larger upper pulley offset to the 12-tooth X-SYNCT pulley wheels. By eliminating unwanted chain movement, X-HORIZONT shifts faster, puts an end to ghost shifting and reduces shift force and chain slap. And with CAGE LOCKT technology, wheel removal and installation are easier than ever.' SRAM. See Cage Lock video. </