Wikipedia
Motorcycle Grasstrack is a form of motorcycle racing which typically, in its current form, takes place on a flat track consisting of two straights and two bends usually constructed in a field.
Undulating hillside tracks were also common in the UK, presenting technically demanding circuits. It is one of the oldest types of motorcycle sports in the UK with the first meetings having taken place in the 1920s. Postwar grasstrack circuits included "permanent" venues such as Brands Hatch and Mallory Park which were not simple oval shapes, although solo motorcycle races were run in an anti-clockwise direction.
Later, these were converted into tarmac circuits with races using the more common clockwise direction associated with modern roadracing. Competitors of the postwar era included now-famous names such as Bernie Ecclestone and Murray Walker. In the modern era, it is generally similar to Speedway with races usually taking place over 4 laps from a standing start. Unlike Speedway, which has 4 riders per race, Grasstrack racing can have many riders in each heat and the circuit is normally longer allowing higher speeds. Grasstrack has three solo classes, 250 cc, 350 cc and 500 cc together with three sidecar classes; left-handed 500 cc and 1000 cc (turning left) and right-handed 1000 cc (turning right).
Many famous Speedway riders such as 1976 world champion Peter Collins started their racing careers in Grasstrack. Some Speedway riders continue to take part in national Grasstrack meetings when their schedule permits.
The British Grasstrack season usually starts in early spring around the Easter holidays and runs through the summer/autumn months. More spectacular racing takes place at larger roped tracks including the Poacher and ASTRA Champion of Champions and Grand Slam meetings in Kent and in particular the most exciting meeting of all at the famous Rhodes Minnis circuit.
The pinnacle of the domestic Grasstrack season is the British Masters Championships. This official ACU championship is where the British champion is crowned in the mainstream 500 cc solo and 1000 cc right hand sidecar classes.
In Europe the same sport is often called Long Track racing. This is exactly the same setup as British grasstrack which has tracks normally around 600–800 meters in length, but is held on the continent with tracks up to 1000–1200 meters in length and with speeds reaching 90 mph – 100 mph. The machinery used is the same as are the riders.