Radial Owners Group

Radical Sportscars is an auto manufacturer and constructor of racing cars from England. The company was founded in January 1997 by amateur drivers and engineers Mick Hyde and Phil Abbott, who built open-cockpit sportscars which could be registered for road use and run on a track without modification. Although most of Radical's sportscars are road legal, they also build some purpose-built racing cars, such as the SR9 Le Mans prototype.The company's first car, the 1100 Clubsport, was based on a Kawasaki motorcycle engine placed inside a small open-cockpit chassis which could house two adults. The cars were intended to run in the 750 Motor Club's races under the Sports 2000 category, with co-founder Hyde driving.

In 1999, Radical had built enough 1100 Clubsports that they decided to create a one-make series based around the car. Backed by the British Racing and Sports Car Club, the series featured identical cars that were open to anyone who owned an 1100 Clubsport. The same year, Radical debuted their second model, the Prosport. Available with Kawasaki or Suzuki engine up to 1500 cc in displacement, the Prosports were even more powerful and faster than the Clubsports, and even included an adjustable rear wing. The cars were also brought to the United States for the first time, for use in the SCCA D-Sport class in 2000.

Radical's next creation was the SR3, a car which could compete in international racing, such as the FIA's C3 class. The car uses a Suzuki-based engine tuned by Powertec engine which offered 1300 cc or 1500 cc versions and a maximum of 252 hp (188 kW) in the latter. A six-speed sequential gearbox was developed specifically for the car to improve performance. The SR3 could also be road legal in the United Kingdom with the addition of turn signals, a hand brake, a catalytic converter, and road legal tires.

In 2006, Radical would make it's largest leap into motorsport with the development of the SR9, a complete Le Mans prototype which fit into the LMP2 class. Official partner Rollcentre Racing would debut the car with success in the Le Mans Series and 24 Hours of Le Mans.

Radical was able to move into the CN class of cars, used in VdeV and hillclimbing events throughout Europe, in 2007. The SR5 was based around a Honda VTEC 2.0 L engine which could produce 237 hp (177 kW), although a Ford Duratec was also available.