These are genuine Dorado HD-E710 replacement rotors. Available sizes for HD-E710 are 180mm and 203mm. Do not attempt to use standard bicycle rotors with the Dorado brake system. These rotors are 2.3mm thick compared with standard rotors at 1.8mm thickness. Your HD-E710 braking system will not perform properly without the correct rotor thickness. We recommend replacing rotors after .5mm wear for proper braking performance.