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The modern Olympics contains several bicycling events, including track cycling, road cycling, mountain biking, and BMX.
A Metric Century is a long distance bicycle challenge ride, a distance of 100 km or about 250 laps around a typical U.S. high school track (~400 meters per lap).
The Tour de France is an annual contest where bicycling competitors cover about 3500 km in multiple stages over a diverse and demanding route. Up-to-date information can be found at the official site.