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bike booster, BoosterPack' Kit: A New Ultralight Electric Assist – EngineerDog.com, Amazon.com : BAIZIFU DIY Electric Bike Conversion kit 200W Brushless Motor and Controller for E-Bike Bicycle Booster 48V 36v Mountain Modification Ps, 160x120x80mm/6.3x4.7x3'' : Sports Outdoors