This wheel hub motor, made of aluminum alloy and iron, is a great choice for you to refit your bike. All you need to do is put it on your tires to enjoy your new ride! Key Features High-speed Riding: The 500W motor with 350RPM can provide strong power and 30-40km/h speed and give you a faster and unforgettable riding experience. Energy-saving Riding: Its maximum efficiency is up to 89%, which means that you can enjoy a smoother and efficient ride with just easy control! Low Noise: Due to a brushless gearless motor, it produces low noise when riding, and can create a more comfortable riding environment for you.Easy to Install: Its simple str.