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Cyclocross
From WikiPedalia
A type of off-road race using bicycles that resemble road bikes. Cyclocross courses are very rough and muddy, and are designed to force the competitors to dismount and run with their bicycles several times per lap.
Cyclocross originated as a winter training activity for road racers, and originally was done on retired road bicycles, modified for off road use. Gradually, competitive pressures caused the development of purpose built 'cross bicycles.
