Fitment: Mini bike disc brake replacement for Motovox Coleman Monster Moto Mega Moto Baja TrailMaster mini bike. Compatibility: Monster Moto Mega Moto Classic 80cc MM-B80 105cc MM-B105 1000w electric mini bike, Baja Motorsports Doodle Bug DB30 (Blitz, Dirt Bug), Hensim Doodle Bug DB30 (Blitz, Dirt Bug), TrailMaster MB Storm, Motovox MBX10 MBX11, Coleman CT100U CC100X. Note: This disc brake rotor doesn't work on pit bike pit bike and bicycle, just for mini bike. Pls check the fitment and original one of your mini bike before purchasing. Durable Material: 180mm disc brake rotor is made of steel, durable and not easy to deform. Size: Mounting hole distance (center to center, bolt hole circle): 25 mm (0.98 inch). Center hole diameter: 37 mm (1.5 inch). Overall diameter: 180 mm (7.1 inch). Mounting hole diameter: 6 mm (0.2 inch) x 6