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Built-in Controller 250W 350W 500W 750W 1000W 1200W 36V 48V 60V Brushless Direct Motor Electric Bike Conversion Kits, Find Details and Price about Electric Bike Conversion Kits Built in Controller Motor Kit from Built-in Controller 250W 350W 500W 750W 1000W 1200W 36V 48V 60V Brushless Direct Motor Electric Bike Conversion Kits - SAILI MOTOR CO., LTD.