The SRAM GX Eagle rear derailleur gets it done with an updated cage architecture that improves chain management. Also refined to work with the new 10-52t cassettes. Riders want the derailleur to do its job shifting on command, whether under climbing load or the stage finish, the GX Eagle derailleur does just that!Key Features:Speed (RD): 12s Cable pull ratio: X-actuation Cage (RD): Long Max tooth: 52 Colour (RD): BlackPulley bearings material: Steel Cage material (RD): AluminiumCage LockWith CAGE LOCK technology in the rear derailleur, wheel removal and installationas well as chain installationbecomes faster and simpler. Just push the cage forward to create slack and lock it into placeRoller Bearing ClutchROLLER BEARING CLUTCH technology eliminates derailleur bounce and chain slap without sacrificing precision.X-ActuationDeveloped specifically for SRAM 1x, X-ACTUATION keeps shifting sharp and consistent across the entire cassetteX-HorizonThis rear derailleursstraight parallelogram