A bicycle is a two-wheeled vehicle that is powered by pedals and steered by handlebars. It is an efficient means of transportation that is environmentally friendly and economically practical. It requires relatively little maintenance and can travel long distances at reasonable speeds. It can carry riders, cargo, and even people in wheelchairs. Its simple design and efficient operation make it an appealing form of transport for children and adults.

A person can learn to ride a bike in as few as 10 steps. A new rider must concentrate on balance and coordination, but after a few practice rides can easily ride with confidence. More experienced riders often experiment with different techniques to improve their speed or endurance. Some cyclists take their bikes to races or other events where they compete with other riders.

The frame of a bicycle is usually made from steel, but more expensive models are often constructed from aluminum alloys or carbon fiber. These materials allow designers to produce lightweight frames that can also be strong enough to support a large amount of weight. The wheels of a bicycle are typically made from a hub, spokes, and a metal or rubber tire. The ball bearings in these components are held in a cup that screws into one of the cones on the bicycle’s crank axle. A bit of grease in the bearings makes the wheel and pedal assembly run smoothly.

Bicycle tires are designed to handle a variety of terrains, and the tires on a road bike are typically sturdier than those on a mountain bike. Some cyclists also add mud or snow tires for use in inclement weather. In addition to tires, bicycles have a wide variety of other accessories available for purchase. Many bicycles come equipped with racks to hold bags or other gear. Child seats or trailers can be attached to the rear of a bicycle to carry extra riders. Pegs can be fastened to a bike’s frame to help perform tricks or to provide a place for a rider to stand.

People who regularly ride a bicycle experience a variety of health benefits. Cycling is a great cardiovascular exercise that helps to strengthen the heart and blood vessels and improve the health of the lungs. It can also be a relaxing activity that helps to relieve stress. Some studies have shown that regular cycling reduces the risk of certain cancers, such as colon and breast cancer. Moreover, it can help to prevent type 2 diabetes by replacing sedentary time with healthy exercise. However, it is important for people to use bicycles responsibly, as they can be dangerous if ridden recklessly. For this reason, they should always obey traffic laws and signal before turning. They should also wear bright, reflective clothing and be aware of their surroundings at all times. If they encounter a car, they should move to the right of the roadway to avoid being hit. They should also be prepared to stop quickly if needed.