Assaf Biderman, co-inventor of the Copenhagen Wheel
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US company reinvents wheel to make bikes electric

18 December 2013 Last updated at 20:19 GMT

A new device has been launched that can transform almost any bicycle into an electric-hybrid vehicle.

The Copenhagen Wheel is a self-contained unit that replaces the rear hub of a bicycle wheel.

It stores energy, which can later be released if a cyclist needs help.

Claire Brennan reports.

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