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): AluminiumRiders 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, it’s also backwards compatible for the 10-50t versions. Giving riders choice, because that’s how it should be. Finished with the new GX Eagle™ master colorway – to compliment any cassette and chain colorway a rider wants from the Eagle™ Colorsystem. Further proof that the GX Eagle™ derailleur is there for one thing - to do the job.FEATURESBackwards compatible, works with both 10-50t and new 10-52t cassettes.Updated cage architecture provides better chain retention and precise shifts.Comes in GX Eagle™ master colorway as part of Eagle™ Colorsystem and goes with all colors of Eagle cassettes & chains – from Black to Gold to Rainbow, to HardChrome and new Copper.