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BMX
From WikiPedalia
Bicycle Motocross, a type of dirt-track racing, primarily for children and teenagers. Competitors usually ride 20" wheel, single speed bicycles with a freewheel and a rear hand brake. Races, called "motos" usually last less than two minutes, and feature jumps. High-level BMX races mostly hinge on getting a good start off the line, which, for some reason, is called a "hole shot" BMX tracks use mechanical starting gates that fall forward under the riders' wheels when released.
