Riders want the derailleur to do its job shifting on command, whether under climbing load or the stage finish. The SRAM GX Eagle Derailleur gets it done with an updated cage architecture that improves chain management. Refined to work with 10-52T cassettes, it is also backward compatible for the 10-50T versions – giving riders choice, because that's how it should be. FEATURES : Backwards compatible so it works with both 10-50T and 10-52T cassette options Updated cage architecture provides better chain retention and precise shifting GX Eagle master colorway goes with all colors of eagle cassettes & chains Cage Lock for easy removal of the rear tire Roller Bearing Clutch technology eliminates derailleur bounce and chain slap X-Actuation developed specifically for Sram 1x systems for sharp shifting through the entire cassette SPECS: Speed: 12 Speed Shifter Compatibility: SRAM Mountain (12 Speed) Shift Mechanism: Cable Actuated Max. Tooth: 52T Min. Tooth: 10T Chain Wrap Capacity: 42T Cage Material: Aluminum Chain Retention: Clutch Color: Grey