Fifty Bicycles That Changed the World

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"To change gears, the rider needed to stop, remove the wheel, flip it over, re-tension the chain and tighten everything up again." 变个速跟拆车一样也太麻烦了，不过麻烦使人进步，这不，一个被影响了比赛的选手出手了： "It is said that, in 1924, a keen amateur c...  (展开)