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Dirt track racing is the single most common form of auto racing in the United States. According to the National Speedway Directory, there are over 700 dirt oval tracks in operation in the US. [1] The composition of the dirt on tracks has an effect on the amount of grip available. Many tracks use clay with a specific mixture of dirt.
Dirt and grass track bikes have capacities of 250, 350, 500 and in the solo classes and can reach speeds of up to 80 mph (130 km/h) on the straights and with no brakes fitted to the machine. The American Grand National dirt track championship uses motorcycles of up to 750 cc capacities and can reach speeds of up to 130 mph (210 km/h). [1] [2]
Kart racing or karting is a motorsport discipline using open-wheel, four-wheeled vehicles known as go-karts or shifter karts. They are usually raced on scaled-down circuits, although some professional kart races are also held on full-size motorsport circuits. Karting is commonly perceived as the stepping stone to the higher ranks of motorsports.
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From 1981 to 1987 the World Championship was raced only with 135 cc Formula K Engines. Before and after the short inaugural return to 100 cc( 1988 and 1989 with Formula SuperCent (FS100) a category that anticipated the so-called Formula Super A) the 100 cc direct-drive karts was the prevailing standard.
The Memphis International Raceway (more commonly known as MIR) was founded in 1986 by Ed Gatlin, who along with a group of investors, bought a 400-acre tract of land within the northeastern section of Shelby County, and built a drag strip with an adjacent road course, including a dirt track and a go-kart track. [2]
Brennan Poole in a UMP Modified at Houston Raceway Park in 2008.. United Midwestern Promoters (UMP) is a short track motor racing sanctioning body in the United States that sanctions short track racing on dirt race tracks from 1/5 mile (0.3 km) in length to 1-mile (1.6 km) in length.
The 2008 Grand Prix was the final race held on the "old" track north of Ross–Ade Stadium. This track was demolished due to the Mackey Arena expansion project. The new track, which has been used since 2009, is located at the Northwest Sports Complex. It cost roughly $1 million to build and is modeled after the World Kart Championship Track in ...