Thismountain bicycle features oversized tires, a full-suspension frame, two disc brakes and handlebars oriented perpendicular to the bike's axis.Atime trialracing bicycleA Half Wheelertrailer bike at theGolden Gate BridgeWorking bicycle inAmsterdam, NetherlandsABMX bike, an example of a bicycle designed forsportA racingupright bicycleArecumbent bicycleDiagram of a bicycleATriumph with astep-through frameA set of rear sprockets (also known as a cassette) and a derailleurBicycles leaning in a turnAbicycle with shaft drive instead of a chainA Selle San Marco saddle designed for womenLinear-pull brake, also known by theShimano trademark: V-Brake, on rear wheel of amountain bikeA front disc brake, mounted to thefork and hubTouring bicycle equipped withhead lamp,pump, rearrack, fenders/mud-guards, water bottles andcages, and numerous pannier bagsPuncture repair kit with tire levers, sandpaper to clean off an area of the inner tube around the puncture, a tube of rubber solution (vulcanizing fluid), round and oval patches, a metal grater and piece of chalk to make chalk powder (to dust over excess rubber solution). Kits often also include a wax crayon to mark the puncture location.Abike-sharingstation in BarcelonaWoman with bicycle, 1890sA man uses a bicycle to carry goods inOuagadougou, Burkina Faso
The followingoutline is provided as an overview of and topical guide to bicycles:
Bicycle – pedal-driven,human-powered,single-track vehicle, having twowheels attached to aframe, one behind the other. A person who rides a bicycle is called acyclist or abicyclist, and the activity is calledcycling. Also known as abike,push bike orcycle.
The bicycle has undergone continual adaptation and improvement since its inception. These innovations have continued with the advent of modern materials and computer-aided design, allowing for a proliferation of specialized bicycle types.
Unicycles,tricycles andquadracycles are not strictly bicycles, as they have respectively one, three and four wheels, but are often referred to informally as "bikes".
In its early years, bicycle construction drew on pre-existing technologies. More recently, bicycle technology has in turn contributed ideas in both old and new areas.
A number of formal and industry standards exist for bicycle components to help make spare parts exchangeable and to maintain a minimum product safety.
TheInternational Organization for Standardization,ISO, has a special technical committee for cycles, TC149, that has the following scope: "Standardization in the field of cycles, their components and accessories with particular reference to terminology, testing methods and requirements for performance and safety, and interchangeability."
CEN, European Committee for Standardization, also has a specific Technical Committee, TC333, that defines European standards for cycles. Their mandate states that EN cycle standards shall harmonize withISO standards. Some CEN cycle standards were developed before ISO published their standards, leading to strong European influences in this area. European cycle standards tend to describe minimum safety requirements, while ISO standards have historically harmonized parts geometry. The TC149 ISO bicycle committee, including the TC149/SC1 ("Cycles and major sub-assemblies") subcommittee, has published the following standards:
TheVienna Convention on Road Traffic of theUnited Nations considers a bicycle to be a vehicle, and a person controlling a bicycle (whether actually riding or not) is considered an operator.
