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Vitus is a French bicycle manufacturer best known for its steel cycle frame tubing, and its frames built with aluminium tubes joined to aluminium lugs by bonding - a construction method the company pioneered in the late 1970s.〔Bicycle Accident Reconstruction for the Forensic Engineer, by James M. Green, published by Trafford Publishing, page 6.〕 ==Frames== Compared to modern aluminium bicycle frames, early Vitus aluminium frames, such as the 979, offered more comfort because of the small diameter of the tubes.〔(). Joe Young Custom Wheels, article "Rescue a Classic Bike". Accessed on 16 December 2007.〕〔Bicycle Frame Materials Comparison with a Focus on Carbon Fiber Construction Methods, by Craig Calfee and David Kelly.〕 As a result, the frames lacked some degree of lateral stiffness compared to their steel counterparts. The Vitus 992 improved on the 979 design by pinching the aluminuim tubes into an ovoid shape at certain critical places, greatly improving stiffness. In the early 1980s Vitus begun producing frames using carbon fiber tubing - but did so in keeping with the company's method of using small diameter tubing and bonding lugs. The company later expanded its product offering with carbon fiber semi-monocoque frames (made with more than one monocoque element), like the ZX-1. The ZX-1 was one of the first monocoque carbon fiber bikes made. 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「Vitus (bicycles)」の詳細全文を読む スポンサード リンク
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