Riders want the derailleur to do its job shifting on command, whether under climbing load or the stage finish. The GX Eagle derailleur gets it done with an updated cage architecture that improves chain management. Refined to work with the new 10-52t cassettes, its also backwards compatible for the 10-50t versions. Giving riders choice, because thats how it should be. FFEATURESBackwards compatible, works with both 10-50t and new 10-52t cassettes.Updated cage architecture provides better chain retention and precise shifts.Speed (RD): 12sCable pull ratio: X-actuationCage (RD): LongMax tooth: 52Color (RD): LunarPulley bearings material: SteelCage material (RD): Aluminum