The Messerschmitt KR175 and KR200, and the FMR Tg500, had aircraft-style bubble canopies, giving rise to the term bubble car to refer to all these post-war microcars. Isettas and others also had a bubble-like appearance.
Bubble cars became popular in Europe at that time as a demand for cheap personal motorised transport emerged and fuel prices were high due in part to the 1956 Suez Crisis. Most of them were three-wheelers; this made them still cheaper to run in many places, since they were considered for tax and licensing purposes to be motorcycles.
The vast majority of bubble cars were manufactered in Germany, including by the former German military aircraft manufacturers, Messerschmitt and Heinkel. Automobile and motorcycle manufacturer BMW manufactured the Italian Iso Rivolta Isetta under licence, using an engine from one of their own motorcycles. France also produced large numbers of similar tiny vehicles called voiturettes, but unlike the German makes, these were rarely sold abroad.
The United Kingdom had licence-built right-hand drive versions of the Heinkel Kabine and the Isetta. The British version of the Isetta was built with only one rear wheel instead of the narrow-tracked pair of wheels in the normal Isetta design in order to take advantage of the three-wheel vehicle laws in the United Kingdom. There were also indiginous British three wheeled microcars, including the larger Regal and Robin from the Reliant Motor Company in Staffordshire and the smaller P50 and Trident from the Peel Engineering Company on the Isle of Man.
Bubble cars were superseded by a new wave of 'proper small cars' like the 1959 Austin Mini, which gave far more functionality for their owners for only slightly higher costs. However, the Reliant Robin remained in production until 1997, and production was briefly restarted under licence for a few months in 2002.