The idea of folding a bike is easy to grasp. The bike has been carefully designed to fold easily in two or three movements to make the bike as compact and portable as possible.

Folding bikes tend to be better for everyone, with seat poles and handlebars adjustable to fit most riders. Riders between 1.4m and 2m tall can ride comfortably and are suitable for almost all riders over 12 years of age.

Despite the smaller wheels and altered geometry, the bikes themselves operate in a similar way to regular bikes, with the same concept of pedal and forward, brake and stop. Although at first glance some people might think that small wheels and components might mean that the bike is much slower than a traditional bike, that's not the case.

"When they see you on the street and try to pass you, everyone looks down on you," Zhang said. "Because the wheels are small, they accelerate very quickly, and they're actually geared to the wheel size, so they're actually quite fast."

Folding bikes are not designed for speed and ride upright, but folding bikes can use a higher transmission ratio to compensate for smaller wheels. So each pedal trip is the equivalent of a full-size bicycle. There is also some efficiency in using smaller wheels, especially when accelerating, which, along with greater flexibility, makes urban cycling even better. Not to mention, smaller wheels are sturdier and capable of carrying heavier loads.