Answer:
Mountain biking is a sport of riding bicycles off-road, often over rough terrain, usually using specially designed mountain bikes. In Oregon, one Chemeketan club member, D. Gwynn, built a rough terrain trail bicycle in 1966. He named it a "mountain bicycle" for its intended place of use. This may be the first use of that name. Bicycles were ridden off-road by road racing cyclists who used cyclocross as a means of keeping fit during the winter. Cyclo-cross eventually became a sport in its own right in the 1940s, with the first world championship taking place in 1950. The Rough Stuff Fellowship was established in 1955 by off-road cyclists in the United Kingdom. Throughout the 1990s and first decade of the 21st century, mountain biking moved from a little-known sport to a mainstream activity.
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