3d bike

Human powered personal transport vehicle; that is to say by the traveler himself. Its basic components are two wheels; generally of equal diameter and arranged in a line; a pedal transmission system; a metal frame that gives the structure and integrates the components; a handlebar to control the direction and a seat to sit on. The displacement is obtained by turning the pedal box with the legs that, through a chain, rotates a pinion that 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.