SRAM REAR SX EAGLE AL 12s BLACK A1This new SX Eagle derailleur is the entry point to the Sram Eagle Ecosystem Sharing many features with the rest of the Eagle Ecosystem like the proven Sram 1x specific X Horizon body design, it can accommodate both 11 50T and 10 50T cassettes A full featured Eagle derailleur, compatible with the Eagle Colorsystem X Sync pulley technology provides greater efficiency, crisper shifting, and quieter operation Cage Lock offers discovery level riders easy