What size disc brake rotors does SRAM recommend for eTap AXS HRD? Depending on the system weights and uses, we recommend different rotor sizes and brake compounds. Therefore we created a rotor size and brake pad chart to help you determine the right rotor size for your setup. Related articles What size rotors can I use with Rival eTap AXS? What disc brake pad compound options does SRAM offer for road disc brakes? Is Rival eTap AXS compatible with SRAM RED or Force eTap AXS parts? What is the correct SRAM brake mounting adapter for my road bike? What bottom bracket interface standards are the new SRAM RED or Force eTap AXS™ cranksets designed to work with? Are different spindle lengths required to fit wider variants such as BB386 and BBRight?