The Sram XX1 Eagle AXS Upgrade Kit utilizes the proven backbone of SRAM 1x. With the lightest weight materials and a 520-percent gear range. More secure and longer wearing X-SYNC 2 chainring. The pinnacle of performance, paired with the connected components of Eagle AXS. Ready for the new gen of super bikes.Includes rear derailleur with battery and battery protector, rocket paddle controller with clamp, charger/cord, chain gap tool.Sram XX1 Eagle AXS Upgrade Kit FeaturesXC FOCUSCARBON CAGETI HARDWARE