"Flying Bike's Tail is a portable electric engine for bicycle, that assist you while pedaling. Without the support of any tools or technical intervention, the device allows you to convert your bike fr...
Advantageswell priced bike
Disadvantagesno big extras
AdvantagesGood quality, choice of models to build, interesting vehicles.
DisadvantagesExpensive buying a new set.
Advantageshigh quality, colourful, educational, fun for children