Compatible with Shimano 9, 10 and 11-speed (except RD-7900 and 7970) / Mega Range, SRAM X0/X9/X7, Apex, Rival, Force and Red (> 2011) and Campagnolo 11-speed. Key Features: High-quality aluminum derailleur pulleys Extra stiff for fast shifting High-quality sealed ball bearing 11T. Compatible with Shimano 9 and 10-speed and Campagnolo 11-speed