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Product Name: 500W Electric Mountain Bike Rear Motor Model NO.: DGW22C Type: Motor Trademark: Shengyi Transport Package: Seaworthy Packing Specification: 20"-28" Origin: China Product Description Dimension: 20" -- 28"Spoke Hole: 12G, 36 HolesVoltage: 36V, 48VRated Power: 350W, 500WEfficiency: ≥80%Cable Side: RightNumbers of Magnets: 16 PolesReduction Gear: 1:5.3Mount Size: 138mmSpeed Sensor: 1-6Hall Sensor: With/WithoutWaterproof Grade: IPX5Weight: 3.9 Kgs