Say hello to the Copenhagen Wheel, a device that slips onto your existing bike wheel. It stores the energy that you already use, and saves it for when you need it most. Hills become flat, and you no longer have to expel loads of energy to get around. Curious? Watch the video for more information. It’s a device so simple, you’ll be amazed at what it accomplishes. It just might change the cycling world (and our planet) forever.
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