SRAM X01 Eagle drivetrains are engineered for optimal performance. Eagle drivetrains are designed, tested, and proven to deliver durable performance for all riders. Eagle technology provides an expanded, optimum, gear range and is 100-percent compatible with all levels of SRAM Eagle drivetrain systems. X01 Eagle Upgrade Kit Features Includes Rear Derailleur, Trigger Shifter, Cassette and Chain Color Options: Lunar, Red Cassette Options: 10-50t, 10-12t Rear Speeds: 12-Speed X01 Eagle Upgrade Kit Includes X01 Eagle Rear Derailleur Max Cassette Teeth: 52 teeth Cable Pull Ratio: X-actuation Color: Lunar, Red X01 Eagle Trigger Shifter Shifter Type: Trigger Cable Pull Ratio: X-actuation Cable Length (SL): 2200mm Clamp Included: Yes Color: Lunar, Red X01 Eagle Cassette Range: 10-50t & 10-52t Technology: XG Cogs 10-50t: 10,12,14,16,18,21,24,28,32,36,42,50 Cogs 10-52t: 10,12,14,16,18,21,24,28,32,36,42,52 X01 Eagle Chain Outer Link Finish: Nickel Outer Link Color: Silver Inner Link Finish: Chrome Plated Inner Link Color: Silver Chain Connector: PowerLock Included Chain Lenght (Links): 126 links Pin Variant: Hollow Pin Compatibility: Chain: All SRAM Eagle 12-speed chains Freehub: XD Driver Rear derailleur (10-50t): All SRAM Eagle rear derailleurs Rear derailleur (10-52t): All SRAM Eagle 52t rear derailleurs