Hoping to bring some stability to sports car racing in North America, the Grand American Road Racing Association was founded in 1999. Since then, they have become known as one of the top road racing organizations in the world.
The Rolex Sports Car Series contains two racing classes - the Daytona Prototype class and the Rolex Series GT class.
The faster of the two - the Daytona Prototype class, has redefined prototype racing in North America. These exotic, mid-engine machines are purpose-built strictly for competition on the race track. Cars include BMW Riley, Porsche Riley, Chevrolet Riley, Ford Riley, Ford Dallara, Porsche Coyote, and Ford Lola. Speeds in excess of 185 mph are possible with this class.
Rolex Series GT
The second class is the Rolex Series GT class (GT being short for Grand Touring), where high-performance production-based sports cars are driven. Though these cars may look a lot like the latest high-performance sports cars on the outside, they too are are purpose-built for racing and contain some of the technology found under the hoods of the Daytona Prototype class. Cars include Mazda RX-8, Camaro GT.R, BMW M6, Corvette, and Porsche GT3. Speeds of up to 170mph are seen in the GT class.
The Continental Tire Sports Car Challenge is a support series that is owned and sanctioned the Grand American Road Racing Association. Though most of their races are as a support series, there are a few events in the season where they are the featured attraction.
The series itself is made up of high performance sports cars, coupes and sedans bought straight from a dealer's showroom floor. These are the same cars that are seen everyday on the streets of the world. The only major modifications that are allowed, are made in the area of safety.
There are two classes seen in the Continental Tire Sports Car Challenge - the Grand Sport (GS) class and the Street Tuner (ST) class.
Grand Sport GT
The Grand Sport class features a range of cars such as the Ford Mustang GT, BMW M3 Coupe, Mustang Boss 302R, Subaru WRX-STI, Camaro GS.R, Porsche 997, Porsche Cayman, and Audi S4. The top speed for this class is around 160mph.
Street Tuner ST
The Street Tuner class is limited to four and six-cylinder engines and contain cars such as the Mazda MX-5, Chevrolet Cobalt SS, Honda Civic SI, BMW 328i, KIA Forte Koup, Mazda Speed 3, Volkswagen GTI, Volkswagen Jetta, Boxster, BMW 330, Mazda RX-8, and Mini Cooper S. Top speeds of around 135mph are reached by the ST class.
A typical Continental Tire Sports Car Challenge event often brings more than 50 cars to the track to compete both for the overall win and for class victories. During a race, at least one driver change is mandatory as at least two drivers must race in each competing car under green flag conditions.