Copenhagen Wheel
Any bike can become an electric bike with the help of a Copenhagen Wheel. Wire-free and incorporating a battery and motor, this wheel offers speed and power assistance/boosts for up to 30 miles per charge. It weights 16.8 pounds but more than makes up for it with its advanced e-bike technology, including a regenerating mode where downhill cycling regenerates the batteries. It’s also app-connected and includes Bluetooth technology.
Added: November 2017
This product is sold by Superpedestrian