SRAM GX Eagle Rear Derailleur 12 Speed Black This new GX derailleur not only answers the Eagle(TM) drivetrain's need for greater capacity, but it's also the next evolution of our proven, 1x-specific X-HORIZON(TM) design. The larger, 14-tooth X-SYNC(TM) lower pulley allows 10- to 52-tooth cassette, and also adds to Eagle's overall smooth-pedaling feel. Our new, Type-3 ROLLER BEARING CLUTCH(TM) features a smoother torque curve for a quieter, more consistent operation and feel. CAGE LOCK(TM) has been moved back and out of the way, protecting it from trail debris. And a redesigned, robust mounting system further improves the Eagle(TM) derailleur's performance and overall durability.Includes SRAM Eagle Rear Derailleur Chain Gap Adjustment Gauge!12 speedColor: BlackX-Actuation ratio specifically engineered for SRAM's 1x12-speed Eagle drivetrainX-Horizon design aligns the parallelogram to a horizontal axis providing constant chain gap across all 11 gears resulting in fast, precise shifts with reduced shifter forceType-3: features a smoother torque curve for a quieter, more consistent operation and feel, with an incorporated CageLock feature for faster wheel changes and chain serviceLarge 14-tooth X-Sync lower pulley allows for the 10 to 52 tooth cassette capacity in this compact designMaterial: Aluminum, Steel pulleyStainless hardware290gSRAM GX Eagle Trigger Shifter 12 Speed Rear with Discrete Clamp BlackThe challenges of riding a mountain bike should be kept to roots, rocks, mud, trees, jumps, drops and breathing. Putting total control of your gear selection into the thumb of one hand, it's simple to find the right gear, right now. The GX Eagle(TM) trigger shifter is the control center of the Eagle(TM) drivetrain. Its internal works have been updated to include a 12th gear, and improved to enhance trigger feel, precision and durability.12 speedColor: BlackShifter Style: TriggerRear Der/Shifter Compatibility: SRAM X-ActuationMaterial: Forged aluminum triggerWeight: 122g SRAM GX Eagle Groupset Kit-In-A-Box Mtn Group