In the photo, an unnamed rider ascends the Col de Peyresourde in the 1921 Tour de France. Racers in the Tour in those days still used fixed gear bicycles ... and if you look closely, you can see that his wheels are held in place with wingnuts. It was wingnuts like these that froze shut on Tullio Campagnolo's bike during a mountain race, prompting him to invent the quick release.
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