The new SRAM X01 Eagle 12 Speed Rear Derailleur not only answers the Eagle™ drivetrain’s need for greater capacity, but it’s also the next evolution of SRAM's proven, 1x-specific X-HORIZON™ design. The larger, 14-tooth X-SYNC™ lower pulley allows 10- to 50-tooth cassette capacity in this relatively compact design, and also adds to Eagle’s overall smooth-pedaling feel. A Type-3 ROLLER BEARING CLUTCH™ features a smoother torque curve for a quieter, more consistent operation and feel. CAGE LOCK™ has been moved back and out of the way, protecting it from trail debris. And a redesigned, robust mounting system further improves the Eagle™ derailleur’s performance and overall durability. SRAM X01Eagle 12 Speed Rear Derailleur Features Completely redesigned rear derailleur incorporating the proven X-HORIZON™ design and new Type-3 ROLLER BEARING CLUTCH™ technology Re-engineered mounting system and repositioned CAGE LOCK™ add robustness Eagle™ pulley technology provides greater efficiency, crisper shifting and quieter Aluminum cage and lightweight hardware make it light and tough SRAM X01 Eagle Rear Derailleur Technology Cage Lock Roller Bearing Clutch X-Actuation X-Horizon X-Sync