Citroen's most fabulous model? Probably. Citroen and Maserati were in an alliance at the end of the 60s, which would see hydraulic technology appear in the Merak and Bora. It also meant that Citroen had the use of Maserati's V6 for this Sci-fi coupe. The styling was very DS, but with added French art-deco spaceship. Underneath, it had all of the hydraulic tech you could want, but powered by a characterful engine for a change. Chapron created some amazing convertibles and limousines from the SM.
Standard tyre for the SM is a 205/70VR15.