180mm brake disc (rotor) to fit almost every import pit bike rear wheel. Check the picture for dimensions and compare with your bike for proper fitment. Will fit Honda XR50 and CRF50 with modified disc brake setups and can be used as front or rear wave rotor depending on your caliper mounts. Standard replacement rotor for Motovert, Pitster Pro X2, X2R, OGM, SDG, RCM, Thumpstar, and many more minis.