] The Copenhagen Wheel is a bicycle wheel that stores and delivers electric energy to power a bicycle. Energy comes from an external battery charger, and from regenerative braking when the rider back-pedals as in a coaster brake. It is a Pedelec and includes a built-in electric motor and a 48-volt lithium ion battery and is controlled by a smartphone app. The motor analyses the topography and pedaling activity to decide whether to deliver power. Range is approximately 30 miles.
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] Quora ? - What are the best new products or inventions most people dont know about?