Year Introduced: 1937
Sport: Cycling

Switching speeds on a bike seems like a pretty basic feature today, but back in the day, even the most serious riders didn't have such a luxury. 1937 was the first year that the Tour de France allowed the derailleurs system, more commonly referred to today as gears. Up until then, the riders had actually been forced to get off their bikes in order to switch out wheels for the uphill and downhill sections of the race.