SRAM 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 trigger shifter puts total control of your gear selection into the thumb of one hand GX Eagle chain for smooth and efficient shifting NX Eagle cassette (11-50t) for those without an SRAM XD compatible freehub Details: Includes: Shifter, rear derailleur, cassette, and chain Speeds: 12-speed Color: Lunar SRAM DUB Bottom Bracket and Crankset Sold Separately SRAM GX Eagle Rear Derailleur: Cage: Long Max Cassette Teeth: 52 Cable Pull Ratio: X-actuation Cage Material: Aluminum Bearing Material: Steel SRAM NX Eagle PG-1230 Cassette: Gearing: 11-50t Technology (Cassette): PG Freehub interface: Shimano / SRAM HG Cog Sizes: 11-13-15-17-19-22-25-28-32-36-42-50 SRAM GX Eagle Trigger Shifter: Shifter Type: Trigger Cable Pull Ratio: X-actuation Cable Length (SL): 2200mm Clamp: Discrete Handlebar clamp included, MMX compatible SRAM GX Eagle 12-Speed Chain: Outer Link Finish: Nickel Color: Silver Inner Link Finish: Black Oxide Chain Connector: PowerLock Chain Length: 126 links Pin: Solid Pin PowerLock Link included Compatibility: Chain: 12-speed Eagle chains Compatible Freehub: Fits Shimano/SRAM 8, 9, 10-speed freehub