The Hummingbird Bike weighs only 6.5 kg and comes in two specs: single speed and 5-speed.
The folding bike would also be compatible with the 3 kg Smart Wheel from FlyKly. The Smart Wheel has a range from 40 to 100 km (25 to 60 miles)* and can assist you up to 25 km/h (16 mph). Its 250 W motor is powered by Lithium batteries while all the sensors – motion sensor, torque sensor, motor temperature sensor, system monitoring sensor
Combined the two separate products would weigh less than 9kg (the original hummingbird bike wheel would be replaced by the Smart Wheel)