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A dual-sport motorcycle is a type of street-legal motorcycle that is designed for both on and off-road use. The terms ''all-road'' and ''dual-purpose'' are also used for this class of motorcycles. Dual-sports are equipped with street-legal equipment such as lights, speedometer, mirrors, horn, license plate mounting, and muffler and can, therefore, be registered and licensed. ==Evolution of dual-sports== The concept of a versatile motorcycle equally at home on dirt and pavement is as old as motorcycling itself. Most roads were still unpaved when motorized bicycles first appeared around 1900. In a sense, all motorcycles at that time were dual-sports, intended to be used on dirt as well as pavement. Advertisements well into the 1920s depict motorcycles on dirt roads, raising clouds of dust. By 1940, most roads in developed countries were paved and motorcycles had become heavier and more oriented to the street. In the 1950s and 1960s British manufacturers such as Triumph and BSA offered versions of their relatively light street motorcycles with high exhaust pipes, and called them scramblers.〔Adams, Carl: (2008) The Essential Guide to Dual Sport Motorcycles", pp. 18; Whitehorse Press, New Hampshire. ISBN 978-1-884313-71-4〕 Yamaha is credited with rekindling popular interest in dirt worthy motorcycles that could also be ridden on the street. In 1968 they introduced the hugely successful DT-1 based on a 250 cc two-stroke engine. Other manufacturers soon followed with similar models called "enduros". These light weight machines were good on trails and adequate on pavement. Some manufacturers approached the trend from the opposite direction, beginning with a street motorcycle and modifying it for adequate off-road performance. For instance, the Honda CL350 Scrambler was a variation on the Honda CB350 street motorcycle with high exhaust pipes, a larger front wheel, dirt-oriented tires, and lower gearing. Over the next 20 years, manufacturers began producing heavier and less dirt worthy enduros based on four-stroke engines, as they searched for better combinations of weight, power, durability, performance and comfort. The heavier machines were less popular with “real” dirt riders, who began modifying them to create lighter and more competent trail machines. Suzuki introduced the DR350 in 1990 and promoted it as a DualSport or “dirt bike with a license plate”. The terms "dual-sport" and “dualie” were quickly adopted by riders and the motorcycle press. Manufacturers use several different names for their dual-sport models. Suzuki uses DualSport to describe its products. Kawasaki describes its offerings as dual purpose, Honda lists its entry under off-road, and other manufacturers describe machines as enduros, or simply list them as model numbers. A few models are described as "adventure bikes". Despite these differences in terminology, these models can be described as dual-sports, which are street-legal motorcycles that can be operated on pavement, dirt roads and trails. Dual-sport motorcycles are the most practical choice in rural areas in many parts of the world, and when traveling on unpaved trails they can often be a necessity. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Dual-sport motorcycle」の詳細全文を読む スポンサード リンク
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