Part 1 of Essay
A bicycle is a two-wheeled, steerable machine propelled by its rider; the bicycle is said to be the most efficient means yet devised to convert human energy into propulsion. First made in the early 19th century, it developed as an important means of transportation and as the basis for a world-wide sport and industry. Bicy ....

Part 2 of Essay
.... with the first machines to modern day super-light- weight machines. Most written sources agree that the first bicycle was introduced around 1817 by a man called Von Drais. This wooden two-wheeled vehicle that weighed some 45kg (100 lbs). It comprised of a wooden beam structure, straddled by the rider, with a fixed wooden rear wheel and a steerable wheel in front, controlled over a tiller mechanism. It was propelled by pushing off with the legs, rolling along between these propulsive pushes. (fig 1) page 14 v ....