New for 2021 The GX AXS upgrade kit is your entry point into wireless drivetrain simplicity. Compatible with any of SRAM’s Eagle ecosystem cassettes and crank arms the upgrade kit allows you to experience AXS without needing to buy an entire groupset provided you already are using Eagle products. The GX Eagle AXS derailleur is smart enough to protect itself thanks to its incredibly resilient Overload Clutch. Engineered with a variety of rider preferences in mind it is compatible with our new expanded range 10-52T cassette as well as our 10-50T cassette.