This Universal Parts 180mm Disc Brake Rotor replaces a warped, scored, or worn-thin front rotor on full-size scooters, including many GY6 125cc/150cc and 139QMB 50cc models. Its wave-cut stainless steel braking surface with slotted and drilled petals sheds heat and clears brake dust for strong, consistent stopping. The red offset center hub bolts on with a 3-bolt pattern.
Fitment varies by make and model. Compare the diameter, center bore, bolt spacing, thickness, and offset with your existing rotor before ordering.
Clean the hub mounting surface, use thread locker on the rotor bolts, and torque them evenly. Bed in new pads and rotor with several moderate stops before riding hard.
