Riding is easily mastered, and bikes can be ridden with little effort at 16–24 km (10–15 miles) per hour—about four to five times the pace of walking. The bicycle is the most efficient means yet devised to convert human energy into mobility. Bicycles are widely used for transportation, recreation, and sport (see cycling).

It is estimated that there are more than 1 billion bicycles worldwide. Around 450 million of them are in China, and about 100 million in the USA. (Statista) Globally, 42% of households own at least one bicycle (580 million or more bicycles).

The first constructed bike was almost entirely made of wood, and several thousand were built and used. As you can imagine, its popularity dramatically faded when the number of accidents soared - it was prohibited by the police! 2 The world's longest bike was 135 feet and 10.7 inches long

Bicycles are human powered vehicles, typically featuring pedals, a seat, two wheels and a frame. There are over one billion bicycles found throughout the world. Bicycles are used for transport, recreation, competitive racing, courier delivery and a range of other tasks.