How do I know which flat mount caliper adapters to use with Rival eTap AXS? April 15, 2021 13:36 Updated See the SRAM spare parts catalog for details on brake caliper adapters here. Related articles If my frame has post or IS disc brake mounts, can I use Rival eTap AXS with my bike? Are there Rival eTap AXS rim brake and disc brake options? What size rotors can I use with Rival eTap AXS? What disc brake pad compound options do you offer for Rival eTap AXS HRD brakes? How do I upgrade my current bike to Rival eTap AXS? Comments 0 comments Please sign in to leave a comment.