SRAM REAR RIVAL ETAP AXS XPLR E1 13s BLACK 46T MAX BATTERY NOT INCLUDED (P)Perfect shifting through better design, even through the toughest gravel terrain Hangerless Interface and Full Mount attachment allow for the most precise shifting and the ultimate resistance to impact 1x specific for use with 10 46T XPLR 13 speed cassette and Flattop chains Superior chain management with MTB inspired spring clutch Simple setup with no adjustment screws Replaceable and rebuildable parts Battery not included