Vehicle human-powered personal transport; ie by the passenger himself. Its basic components are two wheels; generally equal diameter and arranged in line; a transmission system pedal; a metal box that gives you the structure and integrates the components; handlebars for steering and a saddle to sit. The displacement is obtained by turning the housing with the legs of the pedals via a chain rotates a sprocket, which in turn rotates the rear wheel on the pavement. The basic design and configuration of the bicycle has changed little since the first chain drive model developed around 1885.