Copenhagen wheel by Superpedestrian

Designed to fit easily on an everyday bike, the Copenhagen wheel offers wireless connectivity and contains a motor, batteries, sensors and a control system. The designers say that it learns how you pedal and multiplies your power from three to 10 times. You don’t have a throttle; instead, the wheel measures your effort and boosts your power accordingly. Pedal harder and the wheel provides increased power. You can alter the level of power assistance you are given via a smartphone app. Whenever you brake or go downhill, the wheel takes energy and stores it in the lithium battery for use later. Superpedestrian say that the 700c/26in wheel has a range of up to 31miles and the battery life is good for 1,000 cycles. It takes around 4hrs to charge. The motor is 350W in the US, 250W in the EU, and it weighs 5.9kg (13lb). The price is US$799.

superpedestrian.com