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The Lotus 25 and 33 were innovative and highly successful Formula 1 racing cars. Between 1962 and 1965 these cars were the class of the field. Jim Clark won the driver's title with the type 25 in 1963 and in the type 33, which evolved from the 25, he won again in 1965. The 25's slender shape, light weight, monocoque construction and advanced specification made it a landmark car in the context of racing car design. It ranks as one of Colin Chapman's most successful creations. During its 5-year life-span as a front-line model it was continuously developed, and in 1966 it was still outperforming many of its competitors. The cars have gained classic status in the history of Formula 1. John Tipler's in-depth study of this remarkable car investigates its origins, specification and design and its extraordinary racing record.