The bike is a two-wheeled vehicle , which are usually the same size and arranged in line . Used to transport thanks to the force exerted on the pedals , it is transmitted to the rear wheel sprocket through a chain of flat links and thus the movement occurs . The basic design and configuration of the bicycle has changed little since the first chain drive model developed around 1885.

Fatherhood bicycle is attributed to Baron Carl von Drais , a German inventor. His rudimentary device, built around 1817 , is urging support the feet alternately on the ground.

There are different sports , encompassed within the cycling, practiced with this vehicle.

I introduced in the nineteenth century in Europe, had a considerable impact on the story , both in culture and industry . At present there are about 800 million bicycles in the world ( most of them in China) , as well as main means of transport , as well as leisure vehicle .

It is a means of healthy, organic , sustainable and very affordable transport, whether to move city as rural areas. Its use is widespread in most of Europe , with countries such as the Netherlands, Switzerland , Germany , parts of Poland and the Scandinavian countries one of the main means of transportation. In Asia, especially in China and India , is the primary means of transportation .

      a sophisticated bike, 1933, which by its difficulty and manufacturing costs did not become popular.

this is a rare model of a bike 

i have no words for this 

oh god, the police saving mobile units