A motorcycle (also called a motorbicycle , motorbike , bike , or cycle ) is a single-track, two-wheeled motor vehicle. Motorcycles vary considerably depending on the task for which they are designed, such as long distance travel, navigating congested urban traffic, cruising, sport and racing, or off-road conditions.
Motorcycles are the most affordable form of motorised transport in many parts of the world, and for most of the world's population, they are also the most common type of motor vehicle. There are around 200 million motorcycles (including mopeds, motor scooters and other powered two- and three-wheelers) in use worldwide, or about 33 motorcycles per 1000 people. This compares to around 590 million cars, or about 91 per 1000 people. Most of the motorcycles, 58%, are in the developing countries of Asia – Southern and Eastern Asia, and the Asia Pacific countries, excluding Japan – while 33% of the cars (195 million) are concentrated in the US and Japan. As of 2002, in the two countries of India and China, there were a total of only 15 million cars, but 71 million motorcycles.
History
Main article: Motorcycle historyArguably, the first motorcycle was designed and built by the German inventors Gottlieb Daimler and Wilhelm Maybach in Bad Cannstatt (since 1905 a city district of Stuttgart) in 1885. The first petroleum-powered vehicle was essentially a motorised bicycle, although the inventors called their invention the Reitwagen ("riding car"). It was designed as an expedient testbed for their new engine, rather than a true prototype vehicle. However, if a two-wheeled vehicle with steam propulsion is considered a motorcycle, then the first one may have been American. One such machine was demonstrated at fairs and circuses in the eastern U.S. in 1867, built by Sylvester Howard Roper of Roxbury, Massachusetts.
In 1894, Hildebrand & Wolfmüller became the first motorcycle available for purchase. In the early period of motorcycle history, many producers of bicycles adapted their designs to accommodate the new internal combustion engine. As the engines became more powerful and designs outgrew the bicycle origins, the number of motorcycle producers increased.
Until the First World War, the largest motorcycle manufacturer in the world was Indian, producing over 20,000 bikes per year. By 1920, this honour went to Harley-Davidson, with their motorcycles being sold by dealers in 67 countries. By the late 1920s or early 1930s, DKW took over as the largest manufacturer.
After the Second World War, the BSA Group became the largest producer of motorcycles in the world, producing up to 75,000 bikes per year in the 1950s. The German company NSU held the position of largest manufacturer from 1955 until the 1970s.
In the 1950s, streamlining began to play an increasing part in the development of racing motorcycles and the "dustbin fairing" held out the possibility of radical changes to motorcycle design. NSU and Moto-Guzzi were in the vanguard of this development both producing very radical designs well ahead of their time. NSU produced the most advanced design, but after the deaths of four NSU riders in the 1954–1956 seasons, they abandoned further development and quit Grand Prix motorcycle racing. Moto-Guzzi produced competitive race machines, and by 1957 nearly all the Grand Prix races were being won by streamlined machines. The following year, 1958, full enclosure fairings were banned from racing by the FIM in the light of the safety concerns.
From the 1960s through the 1990s, small two-stroke motorcycles were popular worldwide, partly as a result of East German Walter Kaaden's engine work in the 1950s.
Today, the motorcycle industry is mainly dominated by Japanese companies such as Honda, Kawasaki, Suzuki, and Yamaha, although Harley-Davidson and BMW continue to be popular and supply considerable markets. Other major manufacturers include Piaggio group of Italy, KTM, Triumph and Ducati.
In addition to the large capacity motorcycles, there is a large market in smaller capacity (less than 300 cc) motorcycles, mostly concentrated in Asian and African countries. An example is the 1958 Honda Super Cub, which went on to become the biggest selling vehicle of all time, with its 60 millionth unit produced in April 2008. Today, this area is dominated by mostly Indian companies with Hero Honda emerging as the world's largest manufacturer of two wheelers. For example, its Splendor model which has sold more than 8.5 million to date.
Technical aspects
Construction
See also: Motorcycle construction and Motorcycle designMotorcycle construction is the engineering, manufacturing, and assembly of components and systems for a motorcycle which results in performance, cost and aesthetics desired by the designer. With some exceptions, construction of modern mass-produced motorcycles has standardised on a steel or aluminium frame, telescopic forks holding the front wheel, and disc brakes. Some other body parts, designed for either aesthetic or performance reasons may be added. A petrol powered engine typically consisting of between one and four cylinders (and less commonly, up to eight cylinders) coupled to a manual five- or six-speed sequential transmission drives the swingarm-mounted rear wheel by a chain, driveshaft or belt.
Fuel economy
Motorcycle fuel economy varies greatly with engine displacement and riding style ranging from a low of 29 mpg (8.1 L/100 km; 35 mpg ) reported by a Honda VTR1000F rider, to 107 mpg (2.20 L/100 km; 129 mpg ) reported for the Verucci Nitro 50 cc Scooter. A specially designed Matzu Matsuzawa Honda XL125 achieved 470 mpg (0.50 L/100 km; 560 mpg ) "on real highways - in real conditions." Due to lower engine displacements (100 cc–200 cc), motorcycles in developing countries offer good fuel economy. In the Indian market, the second most selling company, Bajaj, offers two models with superior fuel economy: XCD 125 and Platina. Both are 125 cc motorbikes with a company-claimed fuel economy of 256 mpg (0.919 L/100 km; 307 mpg ) and 261 mpg (0.901 L/100 km; 313 mpg ), respectively.
Electric motorcycles
Main article: Electric motorcycleVery high fuel economy equivalents can be derived by electric motorcycles. Electric motorcycles are nearly silent, zero-emission electric motor-driven vehicles. Operating range and top speed suffer because of limitations of battery technology. Fuel cells and petroleum-electric hybrids are also under development to extend the range and improve performance of the electric motors.
Dynamics
Main article: Bicycle and motorcycle dynamicsDifferent types of motorcycles have different dynamics and these play a role in how a motorcycle performs in given conditions. For example, a longer wheelbase provides more stability in a straight line. Motorcycle tyres have a large influence over handling.
Motorcycles must be leaned in order to make turns. This lean is induced by the method known as countersteering, in which the rider steers the handlebars in the direction opposite of the desired turn. Because it is counter-intuitive this practice is often very confusing to novices—and even to many experienced motorcyclists.
Short wheelbase motorcycles, such as sport bikes, can generate enough torque at the rear wheel, and enough stopping force at the front wheel, to lift the opposite wheel off the pavement. These actions, if performed on purpose, are known as wheelies and stoppies respectively. If carried past the point of recovery the resulting upset is known as an "endo" (short for "end-over-end"), or "looping" the vehicle.
Accessories
Main article: Motorcycle accessoriesVarious features and accessories may be attached to a motorcycle either as OEM (factory-fitted) or after-market. Such accessories are selected by the owner to enhance the motorcycle's appearance, safety, performance, or comfort, and may include anything from mobile electronics to sidecars and trailers.
Social aspects
Main article: MotorcyclingPopularity
In many cultures, motorcycles
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