Designed by Ernesto Maserati, they had a front-mounted 4788cc V8 engine, 90 degrees. Roots type supercharger and dual choke Weber carburetor, single camshaft resulted in 320 bhp and a maximum speed of 270 kph. The «RI» denoted Ruote indipendenti, the then innovative independent four-wheel suspension. The cars measurements were wheelbase 2560mm, length 3865mm, width 1490mm, height 1250mm. Chassis #4501 debuted at Grand Prix de la Marne 1935, driven by Philippe Étancelin.