Sram NX Eagle 12-Speed Rear Derailleur This new NX Eagle derailleur features the proven SRAM 1x-specific X-HORIZON design. The larger, 14-tooth X-SYNC lower pulley easily facilitates 11- to 50- and 10- to 50-tooth cassette capacity, and also adds to NX Eagle's overall smooth-pedaling feel. THINGS TO REMEMBER EagleT technology provides an expanded, optimum, gear range making you fast on the flats, giving you control on the climbs and unleashing your speed on the descents. EagleT is a complete drivetrain system that was developed to be an integrated high-performance ecosystem. The engineering and testing that went into the development provide for maximum performance, safety, and long-term durability to ensure a great consumer ride experience. FEATURES AND BENEFITS Completely new rear derailleur incorporating our proven X-HORIZONT design and new Type-3 ROLLER BEARING CLUTCHT technology. EagleT ecosystem-engineered mounting system and CAGE LOCKT positioning add robustness. EagleT pulley technology provides greater efficiency, crisper shifting and quieter operation. SPECIFICATIONS Speed (RD) 12s Cable pull ratio X-actuation Cage (RD) Long Max tooth 50 Color (RD) Black Pulley bearings material Steel Cage material (RD) Steel