The Alvis Speed 20 is a British touring car that was made between late 1931 and 1936 by Alvis Car and Engineering Company in Coventry. It went through four variants coded SA to SD.
In October 1935 the Speed 20 was supplemented by a 3½-litre car initially sold alongside their Speed 20 SD and named 3½-litre SA. After their Speed 20 was dropped from their catalogue the 3½-litre car was given a shorter wheelbase and named Speed 25 SB.
Speed 20 SA
The car could be fitted with a variety of coachwork. Standard bodies were a four-door sports saloon from coachbuilders Charlesworth, a four-seater sports coupé or four-door tourer by Cross & Ellis, but some cars were supplied in chassis form and carried bodies by coachbuilders such as Vanden Plas.[3] The 4-speed gearbox had constant mesh on the top two gears.. It used a single plate clutch, central change lever, open tubular propeller shaft with metal joints (arranged in a straight line), and a spiral bevel fully floating back axle.[1]
Approximately 400 of the SA cars were made.