Are there Rival eTap AXS rim brake and disc brake options? No, Rival eTap AXS is available as flat mount disc brake option only. Both SRAM RED and Force eTap AXS offer a mechanical rim brake option. Related articles How do I know which flat mount caliper adapters to use with Rival eTap AXS? What disc brake pad compound options do you offer for Rival eTap AXS HRD brakes? What size rotors can I use with Rival eTap AXS? If my frame has post or IS disc brake mounts, can I use Rival eTap AXS with my bike? Are Rival eTap AXS shift levers compatible with Eagle AXS rear derailleurs?