Take your SRAM Eagle Transmission to the next level with your entry into the SRAM AXS ecosystem. Designed to make the upgrade from mechanical to wireless as simple as possible, the SRAM GX Eagle Transmission Upgrade Kit includes an AXS-ready derailleur body, an AXS battery, and an AXS Pod controller. Simply remove the threaded cage and mounting bolt from your mechanical Eagle 90 or 70 derailleur and install them on the new GX Eagle Transmission derailleur body. An included Eagle T-Type PowerLock gives you peace of mind when reassembling the chain. Kit to convert the mechanical rear derailleur to AXS wireless