sentences:  The popularity of the little cars declined in the late 1930s as cheaper, powered cars became available, only to rise rapidly when petrol became almost unobtainable during World War II, 1939–1945.However, Mochet's stroke of genius was to make what was the first performance recumbent bicycle, or "vélo couché", using a design that was based on half of his four-wheeled Velocar.This machine, called by the factory the "Velo-Velocar", or "V-V" for short, broke many world cycling records in 1933.