Rear Wheel Rim (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 50, Matrix 50, 49cc Scooters : Get 2 It Parts, LLC offers SAME DAY SHIPPING. FAIR PRICING. SOUTH CAROLINA WAREHOUSING.