A bicycle is a human-powered two-wheeled vehicle that provides both transportation and recreation. Bicycles have been around for over 100 years, and their development continues to be a source of innovation and excitement. The basic components common to most bicycles include a seat, pedals, gearing, and handlebar. The rider’s feet push on the pedals, which in turn drive a crank that turns a chain, which in turn drives the back wheel of the bicycle to propel it forward. The front wheel is connected to the handlebar, so turning the handlebars swivels the front wheel to steer the bike.

Cycling is an excellent form of exercise. It burns calories, strengthens muscles, and improves cardiovascular health. It is also a fun and relaxing way to spend time outdoors. However, cycling should not be performed to the point of exhaustion, and it is important to allow the body to recover from intense exertion.

Unlike motor vehicles, bicycles do not emit pollution and are easy to maintain. They are also relatively inexpensive compared to automobiles. As a result, they are an attractive mode of transportation for people of all income levels. A growing number of cities and states are creating safe bicycle infrastructure, making it safer and easier for people to get around on bikes.

Bicycles are very effective at transporting goods over long distances. They can carry a load up to 150 pounds (68 kg), and they are capable of traveling at up to 20 miles per hour (32.2 km/h). In addition, they can be used for recreational riding, racing, and exercise.

Since the early twentieth century, the bicycle has become a symbol of freedom and individuality. It allowed people to escape from cramped inner-city tenements and commute to work in the suburbs, and it reduced dependence on horses for both transportation and labor. During the summer of 1897, members of the United States Army’s 25th Regiment, the Buffalo Soldiers, traveled more than 1,900 miles on their bicycles to demonstrate the military value of these machines over rough terrain.

In many parts of the world, bicycles are the primary mode of transport for short-distance travel. They are widely used in urban areas to reduce traffic congestion and air pollution, as well as for tourism and fitness. In some places, laws require cyclists to wear a helmet and use reflectors on their clothing and bicycles. Some cyclists choose to add auxiliary saddles or pegs to the frame to transport cargo, children, or equipment. In other cases, a bicycle may be hitched to a trailer or truck for delivery of goods. In some countries, postal workers deliver mail on bicycles. They usually store their letters in front baskets, panniers, or trailers. Many cities also offer bike-sharing programs, where residents can borrow bicycles for short periods of time. In the United States, there are over 200 public and private bike-sharing systems. In these systems, the riders typically pay a small fee to rent a bicycle.