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.
Features
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180mm wave-cut rotor: Stainless steel petal design with slots and drilled holes.
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Red offset center hub: Cup-style hub with six vent slots.
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3-bolt mounting: 57mm bolt spacing, 8.5mm bolt holes.
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Heat and dust control: Cutouts help cooling and keep the pads clean.
Specifications
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Part number: 110-51
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MPN: 4793
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Outer diameter: 180mm
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Inner diameter (center bore): 48mm
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Rotor thickness: 3.5mm
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Offset: 7mm
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Bolt holes: 3
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Bolt hole spacing: 57mm
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Bolt hole diameter: 8.5mm
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Hub color: Red
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Country of origin: China
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Brand: Universal Parts
Model Fitment
| Engine / Type |
Rotor Requirements |
| GY6 125cc / 150cc scooters |
180mm OD, 48mm bore, 3-bolt 57mm |
| 139QMB / QMB139 50cc scooters |
180mm OD, 48mm bore, 3-bolt 57mm |
Fitment varies by make and model. Compare the diameter, center bore, bolt spacing, thickness, and offset with your existing rotor before ordering.
Installation Notes
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.
