SRAM GX 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. The GX Eagle rear derailleur gets the job done with an updated cage architecture that improves chain management and is compatible with both 10-52t and 10-50t cassettes The XG-1275 10-52t cassette offers an expanded 520% gear range and features SRAM's Full Pin technology, making it both lightweight and durable (Fits SRAM XD Driver body only) The trigger shifter puts total control of your gear selection into the thumb of one hand GX Eagle chain for smooth and efficient shifting GX Eagle Upgrade Kit Features Includes Rear Derailleur, Trigger Shifter, Cassette and Chain Color Options: Lunar Cassette Options: 10-50t, 10-12t Rear Speeds: 12-Speed GX Eagle Upgrade Kit Includes GX Eagle Rear Derailleur Max Cassette Teeth: 52 teeth Cable Pull Ratio: X-actuation Color: Lunar GX Eagle Trigger Shifter Shifter Type: Trigger Cable Pull Ratio: X-actuation Cable Length (SL): 2200mm Clamp Included: Yes Color: Lunar GX 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 GX Eagle Chain Outer Link Finish: Nickel Outer Link Color: Silver Inner Link Finish: Black Oxide Inner Link Color: Black Chain Connector: PowerLock Included Chain Length (Links): 126 links Pin Variant: Solid 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