SRAM X01 Eagle 12 Speed Long Cage Rear Derailleur

• Color: Choose between Lunar OR Red
• Speeds: 12
• Compatibility: 10-52t
• Completely redesigned rear derailleur incorporating Sram's proven X-HORIZON design and new Type-3 ROLLER BEARING CLUTCH technology
• Inner/Outer Cage: Forged aluminum
• X-HORIZON, X-ACTUATION, X-SYNC, ROLLER BEARING CLUTCH, CAGE LOCK
• Published Weight: 276g 

The larger, 14-tooth X-SYNC lower pulley, allows 10- to 52-tooth cassette capacity in this compact design, and also adds to Eagle overall smooth-pedaling feel.