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The fork is what attaches the front wheel to the bicycle. The fork provides steering. Forks are made in rigid versions as well as suspension. Forks are made of a variety of materials ranging from carbon to steel. Forks are also made in single crown and dual crown applications. Dual crown forks are most commonly used on downhill and freeride bikes as they provide a stouter/stiffer front end that is more capable of abuse and has a higher durability. Some suspension companies also make dual crown forks for trail bikes. Maverick and Specialized are the two primary companies that do this. The major manufacturers run single crown forks on nearly all forks with 7 or less inches of travel.