What size disc brake rotors does SRAM recommend for eTap AXS HRD? SRAM USA May 23, 2019 20:18 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? Are 11-speed SRAM RED eTap derailleur batteries compatible with SRAM RED and Force eTap AXS derailleurs? What type of brake pad compound comes stock with SRAM RED and Force eTap AXS HRD disc brakes? What disc brake pad compound options does SRAM offer for SRAM RED and Force eTap AXS HRD brakes? Are there rim brake and disc brake options? Comments 0 comments Article is closed for comments.