Grant Ryan, launched his YikeBike at the Eurobike international trade show in Germany last night.
The "mini-farthing" is being marketed as the world's smallest electric bike and can be folded down into a bag the size of the front wheel.
At total 10kg bike was designed for flat city trips of up to 9km, with a top speed of 20kmh, and takes only about 20 minutes to charge to 80 per cent power.
more at YikeBike.com