SRAM Red eTap AXS HRD Build Kit 1x Hydraulic Disc Flat Mount Center Lock KitSRAM RED eTap shift brake levers seamlessly connect you with your bike. Offering classic eTap shift logic with an updated ability to connect and personalize your bike though the AXS app, youll shift more, with less effort and spend less time doing it. Two Blips ports per side allow the easy addition of Blips and Clics for even more customization X Range gearing system with wider range and closer progression, so youre always in the right gear. One rear