SRAM GX Eagle Trigger Shifter & Rear Derailleur, 12 Speed, LunarSRAM GX Eagle Rear Derailleur 12 Speed Black This new GX derailleur not only answers the Eagle drivetrains need for greater capacity, but its also the next evolution of our proven, 1x specific X HORIZON design. The larger, 14 tooth X SYNC lower pulley allows 10 to 52 tooth cassette, and also adds to Eagles overall smooth pedaling feel. Our new, Type 3 ROLLER BEARING CLUTCH features a smoother torque curve for a quieter, more consistent operation and