A bicycle is a two-wheeled vehicle with a frame, handlebars for steering and control, pedals for forward movement and brakes. It is used by millions of people around the world for transportation, fitness, exercise, racing and recreation. Riding a bike might seem easy to some, but it is actually an intricate process that involves the rider and the bicycle working together. There are many different types of bikes available to suit individual needs, from beginner-friendly tricycles and training wheels to high-performance race machines and everything in between.

A specialized bicycle designed for the purpose of competing in professional road, track or mountain bike races is known as a racing bicycle. These are often made from lightweight materials and have components like handlebars, seat post and cranks designed for maximum efficiency. Depending on the competition, there may be additional accessories such as a hydration system or electronic drivetrain.

Cycling provides a good cardio workout while improving endurance, strength and flexibility. It can also help reduce body fat and improve bone health. In addition to its physical benefits, it can be a time-efficient mode of transport as it can replace the need for driving a car or taking public transportation.

Health risks associated with cycling generally fall into three categories: traumatic (external) injuries; overuse injuries; and injuries or disorders caused by environmental exposure. The most common type of injury occurs when a person is struck by a moving or stationary object while riding a bike. Most of these accidents result in damage to the cyclist’s arms and legs, but head and neck injuries are also common.

Overuse injuries typically affect competitive cyclists or those who ride for several hours a day as part of their work. They can include wrist pain from gripping the handlebars; back, shoulder and neck pain from improper posture; knee pain from repetitive flexing of the joints; and saddle sores.

An increasing number of people are turning to cycling as a way to get around town and to work. Besides providing an opportunity to enjoy the outdoors, it can be a great form of exercise and a fun way to socialize with friends. However, it is important to understand the basic safety rules of riding a bicycle before beginning your journey on the road.

Frame size is one of the most important factors when choosing a bicycle. Compared to the wheels, which stay the same size on most bikes, frames come in various sizes and shapes. A frame that is too small can cause toe overlap, which happens when the rider’s foot rubs against the front wheel as he or she turns the bars.

Most bicycles use a steel alloy frame for its high strength and low weight, although higher-end models are often made from carbon fiber. Welding techniques have improved since the early days of bicycles, and aluminum alloys are now used in place of steel in many mid-range and high-end frames. There are even bicycles with titanium frames, which are lighter and stronger than steel but still stiff enough for race-level performance.