Are eTap® HRD 2x11 calipers available in both post mount and flat mount? November 21, 2019 17:00 Updated Yes. Related articles Does SRAM make an adaptor to use flat mount calipers with post mount frames and forks? Are eTap® HRD 2x11 calipers available aftermarket for purchase? Can I choose between 140mm and 160mm rotors for eTap® HRD 2x11 brakes? Does SRAM make an adaptor to use post mount calipers with flat mount frames and forks? What are the main differences between RED eTap AXS™ and Force eTap AXS™? Comments 0 comments Article is closed for comments.