classes. Provini won four of the six 250 cc races that season and became a world champion by a huge margin, and MV won the Constructors Championship. The machine was still used in 1959 by privateers, but the factory riders had the new MV Agusta 250 Bicilindrica, on which John Hartle had already won in Belgium in 1957. References Bibliography 250 Monocilindrica Bialbero Grand Prix motorcycles Motorcycles introduced in 1956 Single-cylinder motorcycles