A bicycle is a two-wheeled vehicle that is powered by human pedaling and steered by handlebars. It is sometimes referred to as a bicycle cycle, push bike or velocipede. Bicycles are the most popular means of transportation for people worldwide. They are also widely used for recreational riding, exercise and racing.

Bicycles were first invented in the 1860s. The word bicycle is a combination of the French words for “bi” (two) and “cycle” (wheel). It was not until the late 19th century that bicycles became commonly available, affordable and used as transportation.

There are many different kinds of bicycles, with each type having its own benefits and drawbacks. The most common kind is the road bicycle, which is a lightweight bike designed for speed and endurance. Other types include mountain bikes, which are built for off-road use, and tandem bicycles, which are designed for two riders.

A bicycle requires regular maintenance to keep it in good working order. Generally, routine maintenance involves oiling the chain, cleaning the drivetrain and replacing the tires. Some maintenance tasks can be performed by the rider, while others may require a professional mechanic.

One of the most important parts of a bicycle is its frame. The frame is the main structure of the bike, and it determines the handling of the bike. The frame can be made of metal, wood, bamboo or another material. A good quality frame will be light, strong and comfortable. It will also be well-suited to the rider’s height and riding style.

The next most important component of a bicycle is its crankset, which connects the pedals to the rear wheel via the chain. The crankset is a critical part of the drivetrain, and it can be made from a variety of materials. High-end bicycles feature components made of carbon fiber, which is lighter and stronger than other materials.

Some bicycles have pegs that can be fastened to either of the wheel hubs to allow the rider to perform tricks or provide a place for additional riders to stand. Bicycles can also be fitted with a trailer for carrying cargo or children.

Most basic models of bicycles come with platform pedals, which have a strap that your foot slips into. Other models have a cage or toe clip that you slide your foot into. Cage or toe-clip pedals allow you to pull up on the upstroke of the pedal cycle, which increases your power. They also make it easy to dismount in case you lose control of the bicycle.

The International Organization for Standardization has a technical committee dedicated to cycles. This committee establishes standards for cycles, their parts and accessories. For example, the ISO 14749:2009 specifies the minimum design requirements for a pedal-driven bicycle. This specification is intended to ensure that bicycles are safe and reliable. It also sets minimum performance and safety requirements for parts, such as the front derailleur, which is used to shift gears. The ISO 14949:2009 specification includes specifications for the frame, drivetrain and components.