pedalcykel

A pedalcykel, commonly known as a bicycle, is a human-powered or motor-powered, pedal-driven, wheeled vehicle. It is typically propelled by the rider pushing pedals connected to a chain, which turns the rear wheel. The rider sits on a saddle and steers using handlebars.

The basic design of the bicycle has remained remarkably consistent for over a century. Key components include a frame, two wheels, a drivetrain (crankset, pedals, chain, and gears), brakes, and steering mechanism. Bicycles are widely used for transportation, recreation, exercise, and sport.

The invention of the bicycle is credited to various individuals, with the modern safety bicycle, featuring two wheels of the same size and a chain drive, emerging in the late 19th century. This design significantly improved stability and ease of use compared to earlier models like the penny-farthing.

Bicycles come in a vast array of types, each suited for specific purposes. These include road bikes for speed on paved surfaces, mountain bikes for off-road terrain, hybrid bikes for a combination of uses, and electric bikes (e-bikes) which incorporate an electric motor to assist pedaling. The environmental benefits, affordability, and health advantages associated with cycling have contributed to its enduring popularity worldwide.