CAMBRIDGE, Mass., Dec. 3 (UPI) -- A U.S. company has unveiled a bicycle wheel to accelerate a cyclist going uphill that then charges its internal battery while braking and descending.
The Copenhagen Wheel by Massachusetts start-up Superpedestrian is a replacement rear wheel for a bicycle that converts the energy of braking and descending into a battery-powered boost when the rider pedals uphill or wants more speed on flat ground.