What size disc brake rotors does SRAM recommend for eTap AXS HRD? SRAM USA July 08, 2019 20:41 Updated 160mm for road applications and 140mm for closed circuit applications such as triathlon, TT, cyclocross, and criteriums. Related articles What type of brake pads are required for SRAM eTap AXS HRD road disc brakes? What type of brake pad compound comes stock with SRAM RED and Force eTap AXS HRD disc brakes? Are 11-speed SRAM RED eTap derailleur batteries compatible with SRAM RED and Force eTap AXS derailleurs? What disc brake pad compound options does SRAM offer for SRAM RED and Force eTap AXS HRD brakes? Can I add power to my Force eTap AXS™ crankset? Comments 0 comments Article is closed for comments.