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Frame is the soul of bicycle. A good bicycle frame must meet the three conditions of light weight, sufficient strength and high rigidity. As a kind of bicycle sport, the lighter the weight is, the better, so the more labor-saving and faster you can ride; Enough strength means that the frame will not break or bend under high strength riding; High rigidity means that the frame should be rigid enough. Sometimes a frame with poor rigidity may not have safety concerns, but the transmission of the frame force is poor when riding, which makes the rider feel heavy when treading on it. Even if the frame is light and strong enough, but the rigidity is poor, it is still an unqualified sports bike.
James Finley Scott, a student at the University of California in the United States, was the first person to convert an ordinary bicycle into a mountain bike. After that, cross-country sports gradually became popular in Europe and America, and formed competitions. The International Cycling Union recognized this sport in 1990 and held the World Cup for the first time in 1991.
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