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tandem bicycle
The tandem bicycle or twin is a form of bicycle (occasionally, a tricycle) designed to be ridden by more than one person. The term tandem refers to the seating arrangement (fore to aft, not side by side), not the number of riders. A bike with two riders side by side is called a sociable.
==History==
Patents related to tandem bicycles date from the late 1890s.〔
(【引用サイトリンク】 Patent Pending Blog: Tandem Bike, 1891 )〕 In approximately 1898, Mikael Pedersen developed a two-rider tandem version of his Pedersen bicycle that weighed 24 pounds, and a four-rider, or "quad", that weighed 64 pounds.〔(【引用サイトリンク】 Dursley Pedersen Cycle: Various Pedersen Models )〕 They were also used in the Second Anglo-Boer War. Tandem popularity began to decline after WWII until a revival started in the late sixties. In the UK The Tandem Club was founded in 1971, new tandems came on to the market from the French companies Lejeune and Gitane, and in the USA Bill McReady founded Santana Cycles in 1976.〔(【引用サイトリンク】 Sheldon Brown: Santana )〕 Modern technology has improved component and frame designs, and many tandems are as well-built as modern high-end road and off-road bikes.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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