Sram X5 Rear Derailleur 9 Speed Medium Cage BlackThis Sram X5 Rear Derailleur is designed for a 9 Speed drive train with a medium cage. Designed with the solid Alloy B-Knuckle, Alloy Links, and rugged Grilion Composite P-Knuckle. These long lasting components accentuate Sram’s Exact Actuation and Direct Route shifting technologies to redefine your idea of what smooth shifting should feel like. Weighs only 290 grams.710845673801