The SRAM GX Eagle AXS upgrade kit is your entry point into wireless drivetrain simplicity. Compatible with any of the SRAM 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. No matter if you are looking to upgrade your ride, or looking for great value replacement parts, look no further than the GX Eagle AXS upgrade kit.Includes the SRAM GX Eagle AXS rear derailleur with battery, Eagle controller with clamp, charger with cord, and chain gap tool. The GX Eagle AXS rear derailleur shifts on command, whether under climbing load or sprinting to the stage finish, and is smart enough to protect itself thanks to its incredibly resilient Overload Clutch. Rear derailleur is.