Rival eTap AXS HRD Shift-Brake SystemDescription Wireless shifting and the best hydraulic disc braking anywhere, plus revolutionary eTap shift logic. What more could you want? While Sram could have stopped there, they went further and optimized the hood shape to fit hands of all sizes, for comfortable and controlled braking from any position. AXS technology means personalization is in your hands. Features AXS enabled for easy personalization Wireless electronic eTap shift logic for