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, it’s also backwards compatible for the 10-50t versions. Giving riders choice, because that’s how it should be. Details: Model No: GX Eagle Rear Derailleur Series: GX Eagle Cage: Long Speeds: 12 Max Cassette Teeth: 52 Cable Pull Ratio: X-actuation Cage Material: Aluminum Bearing Material: Steel Color: Lunar Weight: 300 g Compatibility: SRAM Eagle 10-50t & 10-52t cassettes All SRAM Eagle 12-speed chains All SRAM Eagle 12-speed trigger shifters