Take Eagle Transmission to the next level with your entry point to the AXS Ecosystem of wirelessly connected components. Designed to make upgrading from mechanical to wireless as simple as possible the GX Eagle Transmission Upgrade Kit includes an AXS-enabled derailleur body AXS Battery and AXS Pod Controller. Simply remove the threaded cage assembly and mount bolt from your mechanical Eagle 90 or 70 derailleur and reinstall on the new GX Eagle Transmission derailleur body. An included Eagle T-Type PowerLock gives you peace of mind when re-installing the existing chain.