Wikipedia
VéloSoleX is a moped, or motorised bicycle, usually just referred to as 'Solex', which was originally produced by the French manufacturer Solex, based in Paris, France. The company manufactured centrifugal radiators, carburetors, and micrometers, before branching into assist motors and bicycles. The moped originally created during World War II and mass-produced between 1946 and 1988 came in various iterations, whilst keeping the same concept of a motor with roller resting on the front wheel of bicycle
Referred to the company's advertisement as the 'bicycle which drives itself' (« la bicyclette qui roule toute seule »), it became extremely popular with school children, students or plant workers because it was light and extremely economical.