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A radical new bicycle had its first public showing at the National British C

游客2025-05-07  48
问题     A radical new bicycle had its first public showing at the National British Cycling Championships in Shrewsbury last weekend. Based on the gold medal- winning design from the Barcelona Olympics, it is the first commercial mountain bike made of a single piece of carbon fibre.
    Bicycles for amateurs have up to now been made of steel, aluminum or magnesium tubes welded together into the conventional "A-frame" shape. But last year, the British competitor Chris Boardman set world records while winning titles in the Olympic cycling pursuit events on a custom-built, carbon-fibre bicycle with lower weight and wind resistance than standard models. Because carbon fibre is born light and extremely strong, it does not need the A-frame shape, saving further weight Carbon fibre can also be moulded in a single piece, avoiding the weakness of welds.
    The new bike, which will cost between $ 2000 and $ 3000 when it reaches the shops next month, has the same advantages as the Olympic model, it weighs about 11 kilograms, a saving of 1.5 kilograms on metal frames　 With no crossbar, it has a lower centre of gravity, making it easier to use in race conditions. "When you’re doing some aggressive riding, you throw the bike about form side to side," explains Eddie Eccleston, director of British Eagle, a British bicycle manufacturer based in Powys, Wales, which is marketing the bikes. "The low centre of gravity! gives you better control."
    The frames are being made in the US for British Eagle by SP systems in Camarillo, California, which has clients in the aerospace industry.  "This is aerospace technology brought into cycling by enthusiasts," says Eccleston. When professionals tested racing versions of the bike before the Tour de France, they were quicker than metal versions by up to 3 seconds per kilometre.
    The new design has no struts between the saddle and the back wheel; instead, the frame’s flexibility can be "tuned" to individual tastes by changing the mixture of Kevlar fibre and carbon fibre in the back wheel strut, allowing up to 5 centimetres of movement.
    The carbon-fibre design has a lower centre of gravity and smoother back-wheel suspension than conventional bikes.  [br] Which of the following statements is NOT true?
选项 A、The new commercial bike has no crossbar and its centre of gravity is lower than the Olympic model.
B、When the rider is doing some rough riding, the new bike’s low centre of gravity gives him better control.
C、The new bike is made by using aerospace technology and is quicker than the conventional bike by 3 seconds per kilometre.
D、The new bike has no metal bar between the saddle and the back wheel, and the amount of carbon fibre used in the back wheel can be changed according to the user’s taste.
答案 A
解析
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