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Four-cross (4X), also called mountain-cross, not to be confused with fourcross, is a relatively new style of mountain bike racing where four bikers race downhill on a prepared, BMX-like track, simply trying to get down first.
Although cast wheels had already been used on automobiles previously, it was not until the 1927 that the Böhmerland, a motorcycle built in Czechoslovakia was fitted with cast wheels. [4]: 72 BMW patented a spoked wheel that cross ran the spokes onto the outside of the rim, allowing the use of tubeless tires. [5]: 31
The motorcycle made its U.S. debut in 1997, where Yamaha Factory Racing rider Doug Henry led every lap of the main event at the 1997 AMA Supercross Finale and became the first person to win an AMA Supercross race on a four-stroke powered motorcycle. [20]
By 1983, the Grand National Championship had become the best attended form of dirt track racing in America, either on two wheels or four wheels. [14] This would be the high point for the championship as, other forms of motorcycle racing such as motocross and road racing began to overtake dirt tracking in popularity. [15]
Supermoto motorcycles were designed to compete on a single course that alternated between three genres of motorcycle racing: road racing, track racing, and motocross. This increasingly popular type of motorcycle is often a dual-sport that has been fitted by the manufacturer with smaller rims and road tires.
Supersport racing is another category of motorcycle road racing that employs modified production motorcycles. To be eligible for Supersport racing, a motorcycle must have a four-stroke engine of between 250 and 600 cc for four-cylinder machines, and between 600 and 750 cc for twins, and must satisfy the FIM homologation requirements. Supersport ...
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