SRAM X.9 Rear Derailleur, 8/9s, Medium Cage, 205g

• Updated X.O-style design with a slimmer and lighter profile over previous X.9
• Di.R.T (Direct Route Technology) for light-effort shifting performance
• Compatible with ESP (1:1 ratio) trigger and twist shifters
• Aluminum inner/outer links, alloy inner/outer cage (composite on short cage model), steel tension spring, and a forged alloy B-knuckle with alloy bolt
• Hardened pivots, ported 11-tooth pulleys, and a polished alloy finish