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Which iconic multi-stage road race first permitted riders to use derailleur gears in the year 1937?

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Correct answer: Tour de France

Although derailleur systems were invented much earlier, Tour de France organizer Henri Desgrange resisted them for years, believing they made the race too easy. When they were finally allowed in 1937, all riders used them, forever changing how cyclists tackle steep mountain passes. Photo: Ralf Roletschek, Wikimedia Commons, GFDL 1.2.

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Source: Wikipedia (CC BY-SA)

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