実業団
These 1921 Grand Prix chassis were amenable to changes of both engine and body. Two engines were used in competitions; the 1921 3-litre straight-eight dohc and the 1916 4.9-litre. Body types included two-seaters and single-seater with pointed tails, slanted tails or exposed fuel tank. Bonnets were adjusted according to the type of carburettors and engines used. In addition, radiators and badges of the three firms constituting S.T.D. were interchangeable. The Works selected the most appropriate combination of body, engine and radiator for each speed event. The cockpit arrangement as well as car dimensions were arranged according to each pilot's specific requirements; resulting in tailor-made cars for the Works team drivers.