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Class 1
Grand Prix cars manufactured between 1925 and 1934
The cars must be equipped with wheels no less that 18" in diameter. Many of the cars in this class were two-seat cars such as Bugatti and Alfa Romeo. By the early 1930s however, Grand Prix racing was changing to ’monoposto’ cars.
Class 2
Grand Prix cars manufactured between 1935 and 1951
Pre-war this class was dominated by Mercedes and Auto Union with Bugatti, Alfa Romeo and Maserati cars also competing. Post-war the Alfa Romeo 158 was very successful joined by the Maserati 4CLT, Gordini and Talbot-Lago cars.
Class 3
Voiturette cars of 1.5 litres built before 1940
At a lower level to Grand Prix racing were the voiturette races. ERAs and the smaller Maserati cars such as the 4CM and 6CM dominated this class.
Class 4
Grand Prix and Voiturette cars 1930 - 1951 over 1.5 litre fitted with 16" wheels
The move to smaller wheels started in the 1930s. Unable to compete with the might of pre-war Germany, Voiturette cars were enlarged to compete in Grand Prix racing. Post-war 1.5 litre supercharged cars were developed; this saw the introduction of the V16 BRM.
Class 5
Formula 2 cars 1952/53
Formula 1 racing was abandoned for F2 racing during these two years. Ferrari dominated racing supported by Gordinis from France, Cooper Bristols, HWMs, Frazer Nash and Alta cars form the United Kingdom.
Class 6
Formula 1 cars manufactured 1954 to 1958 on 16" wheels
The pinnacle of front-engine Grand Prix car racing. Mercedes, Lancia, Ferrari, Maserati, Vanwall, BRM, Connaught - all great cars of this era, however by the end of 1958 the rear-engine Coopers were making their mark.
Class 7
Formula 1 cars pre 1961 on 15" wheels
The last of the front-engine Grand Prix cars such as the Lotus 16 ran smaller wheels as did the dominating rear-engine Cooper cars.
Class 8
Tasman and Indianapolic cars pre 1961
Post Grand Prix scene cars, built to a correct technical specification but lacking period history.
Class 9
Rear-engine Formula 1 & Formula 2 cars pre 1959 with an engine capacity of not more than two litres
Examples are Cooper models such as T41, T43 and T45.
Class 10
Formula 1 cars manufactured before 1966 equipped with 4 cylinder 1.5 litre engines
Grand Prix racing was restricted to 1.5 litres in 1961 and the Coventry-Climax engine was fitted to most cars such as the Lotus and Cooper.
Class 11
Formula 1 cars manufactured before 1966 equipped with multi-cylinder 1.5 litre engines
The 1961 season was won by the V6 Ferrari but by the end of the year the Coventry-Climax and BRM V8 engines were developed for racing. Porsche (flat-four engine), Lotus. BRM, Lola and Cooper cars were dominant.
Class 12
Tasman and Intercontinental cars manufactured before 1966 with 4 cylinder engines of not more than 2.7 litres
The Tasman series had a capacity limit of 2.7 litres and in the early 1960s, there was an ’intercontinental’ class which catered for the 2.5 litre cars of the pre 1961. Brahmas, Lotus, Cooper and BRM all took part in these races.