SRAM NX Eagle 12-Speed Rear Derailleur MPN 00.7518.119.000 UPC 710845818028 5123457891658 8011717522251 The SRAM NX Rear Derailleur features the X-Horizon 1x-specific design with the X-Sync 14-tooth lower pulley wheel to help make the smooth shifting and pedaling feel that the Eagle line is known for. Another feature of this rear derailleur is its Roller Bearing Clutch that eliminates chain slap and increases drivetrain stability. With Cage Lock, wheel changes are made easy by pushing the cage forward and locking it in place. Features: X-Horizon design X-Sync pulley wheel Roller Bearing Clutch Cage Lock technology Specifications: Speed: 1 x 12 Speed Shifter Compatibility: SRAM Mountain (12 Speed) Shift Mechanism: Cable Actuated Max. Tooth: 50T Min. Tooth: 10T Chain Wrap Capacity: 40T Cage Material: Aluminum Chain Retention: Clutch Color: Black Weight: 339g Does Not Include: 1 B gap adjustment tool, OE Packed, no retail box