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SRAM X7 9 Speed Rear Derailleur 2012
SRAM X.7 Rear Derailleurs 2012: Updated design with a slimmer and lighter profile over previous X.7. Di.R.T (Direct Route Technology) for light-effort shifting performance. Compatible with ESP (1:1 ratio) trigger and twist shifters. Aluminum outer / Steel inner links and cages, Grilon composite P-knuckle, steel tension spring, and an alloy B-knuckle with alloy bolt. Hardened pivots, ported 11-tooth pulleys, and a matte alloy finish.