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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.
Speedway racing typically took place on purpose-built tracks, although in Australia bikes shared larger speedways with Sprintcars, Speedcars (Midgets) and saloons, with tracks traditionally ranging from 1/3-mile showground tracks, such as the now-closed 520 metres (570 yd) Claremont Speedway in Perth and the 509 metres (557 yd) Sydney ...
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]
Motocross (or MX) is the direct equivalent of road racing, but off-road, a number of bikes racing on a closed circuit. Motocross circuits are constructed on a variety of non-tarmac surfaces such as dirt, sand, mud, grass, etc., and tend to incorporate elevation changes either natural or artificial.
The track had previously been dirt until 1999. [3] The track name was also changed from "Spitzer Motor Speedway" to "Mansfield Motor Speedway" for 2017. [3] With the new dirt surface, Mansfield Motor Speedway hosted series like the Lucas Oil Late Model Dirt Series and the Arctic Cat All Star Circuit of Champions.
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Land speed is where a single rider accelerates over a 1 to 3-mile (4.8 km) long straight track (usually on dry lake beds) and is timed for top speed through a trap at the end of the run. The rider must exceed the previous top speed record for that class or type of bike for their name to be placed on the record books. See— for an example.