What size disc brake rotors does SRAM recommend for eTap AXS HRD? November 12, 2020 14:32 Updated 160mm for road applications and 140mm for closed circuit applications such as triathlon, TT, cyclocross, and criteriums. Related articles Can I choose between 140mm and 160mm rotors for eTap® HRD 2x11 brakes? What type of brake pads are required for SRAM eTap AXS HRD road disc brakes? What are the main differences between RED eTap AXS™ and Force eTap AXS™? How do I know when to replace my rotors? How many hours of riding can I get from a fresh set of shifter batteries? Comments 0 comments Article is closed for comments.