Product Description SHIMANO's SM-RTAD05 disc brake rotor adaptor is used for installing a 6-bolt disc brake rotor to CENTER LOCK hub. The adapter features a reliable anti-loosen plate for secure braking in all riding conditions. ・Lightweight and sleek design ・Mud shedding design ・New tightening plate ・Reliable and easy anti-loosen plate ・Compatible for metal pad ・To be used for installing a 6-bolt type disc brake rotor to CENTER LOCK system hub/wheel (SM-RTAD05) ・160 mm, 180 mm, 203 mm