Class 1 : Grand Prix cars (over 1500cc)
Class 2 : Voiturettes (below 1500cc)
Class 1 : Cars built between January 1, 1946 and December 31, 1953 fitted with a supercharged engine of maximum capacity 1500cc or with non-supercharged engine of maximum capacity 4500cc
Class 2 : Formula 2 cars built before December 31, 1953, with non-supercharged engine and a maximum engine capacity of 2000cc
Class 3 : Formula 1 cars built between January 1, 1954 and December 31, 1960 with non-supercharged engines of a maximum capacity 2500cc, or supercharged engines of maximum capacity 750cc
Class 4 : Cars outside classes 1-2-3 but having a historical connection with those entered in the F1 World Championship between 1950 and 1960
Class 1 : F2 built between January 1, 1956 and December 31, 1960
Class 2 : Cars equipped with a 4 or 6 cylinder engine
Class 3 : Cars equipped with a 8 or 12 cylinder engine
Class 1 : Cars with an engine capacity of less than 2 L
Class 2 : Cars with an engine capacity of more than 2L fitted with drum brake
Class 3 : Cars with an engine capacity of more than 2L fitted with disk brakes
Class 1 : Cars built or raced in F1 Grand Prix between January 1, 1966 and December 31, 1969
Class 2 : Cars built between January 1, 1970 and December 31, 1972, equipped with a Ford-Cosworth DFV engine
Class 3 : Cars built between January 1, 1970 and December 31, 1972, equipped with other engines
Class 1 : Cars equipped with a Ford-Cosworth DFV engine
Class 2 : Cars equipped with other engines
Class 1 : Cars not designed to exploit the ground effect
Class 2 : Cars designed to exploit the ground effect, equipped with a Ford-Cosworth DFV engine
Class 3 : Cars designed to exploit the ground effect, equipped with other engines
Class 1 : Cars equipped with aspirated engine