Many things we use every day to go from one place to another move on wheels. For example, the bus, the motor bike, the car and many others move on wheels. One of the things that move on wheels is the bike. Bicycles are important for both young people and grownups. People use them for fun and for work; all over the world. The history of the bike is interesting. In 1818 the bicycle had no pedals. The pedals were added in 1839. The pedals made them move faster than the old ones. More speed was possible by making the front wheel very large. But such bicycles were dangerous to ride. By 1900, most of the bicycle parts that we know today were developed. They include equal-sized wheels, brakes to stop the bike, a chain connecting the pedals to the rear wheel. Using the bike to go to school or to work is a clean way of moving around. Unlike other means of transport, the bicycles does not use petrol. This is meant that the bike keeps the air clean. This is why in some big cities in the world; people prefer riding bicycles to other means of transport.