Wheel Rim (Rear) (3.5x12), Rotor Bolt Pattern=5x80mm (50mm to adjacent stud) Offset=1.25 in, Shaft ID=20 mm Splines=19, Silver Fits E-Ton Beamer R4-150, Matrix 150cc Scooters : Get 2 It Parts, LLC offers SAME DAY SHIPPING. FAIR PRICING. SOUTH CAROLINA WAREHOUSING.