SRAM GX Eagle AXS Upgrade Kit - Rear Derailleur, Battery, Eagle AXS POD Controller w/ Clamp, Charger/Cord, Chain Gap Tool, BlackThe 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.