Automobile classes

Категория транспортных средств, введенная FIA в 1993. Автомобили группы CN в основном используются в чемпионатах по подъему на холм или спортивных гоночных сериях.

In relation to motorsport governed by the Fédération Internationale de l'Automobile, Group R refers to a set of regulations providing production-derived vehicles for rally competition. The Group R regulations were created in 2008 as a gradual replacement for Group A and Group N rally cars. To comply with Group R regulations, a car must be homologated in Group A (or in some cases Group N) and receive one or more VR extensions. Each VR extension is a set of homologated parts and modifications, designed and sold (as a kit or as a complete car) by the manufacturer. As part of its structure, the Group R regulations have a provision for GT cars, known as R-GT.

С 2017 года IMSA разрешила производителям участвовать в соревнованиях по правилам SRO GT4 , полностью отказавшись от оригинального класса Grand-Am Grand Sport в 2018 году.

GT4 class cars are mostly what can be referred to as track day cars, which are factory-built race cars available to the public. However, custom-built cars based on production models can also be built by teams. All cars are test driven by the FIA and then modified so that they all have near identical performance levels. Once a car has been approved by the FIA, it cannot be modified by the teams, eliminating continual development costs for constructors. All cars run on regulated Pirelli tires to further equalize performance.