Sizaire Frères was a French automobile company established in 1920 by brothers Maurice and Georges Sizaire in Courbevoie, near Paris.
The brothers had previously established Sizaire-Naudin in 1903 and later collaborated on the luxury marque Sizaire-Berwick.
In 1923, the company introduced its most significant automobile, the Sizaire Frères 4RI, considered the world’s first production car with independent suspension on all four wheels.
The designation 4RI stood for Quatre Roues Indépendantes (Four Independent Wheels). Powered by a 1,993 cc overhead-camshaft four-cylinder engine producing approximately 50 horsepower, the automobile was remarkably sophisticated for its era.
The company’s advertising emphasized its innovative suspension with the slogan “Est indépendante de la route” (Independent of the Road). Its distinctive radiator emblem featured an intertwined white “SF” monogram against a dark background, framed by the SIZAIRE and FRÈRES wordmarks.
Despite its technical achievements, the company struggled commercially. Approximately 900 examples of the 4RI were produced by 1927, and French automobile production ended in 1929.
Today, Sizaire Frères remains an important but largely forgotten pioneer of automotive suspension technology.
