Immediately after the end of World War II, Renzo Rivolta decided to devote his company to the production of motorbikes, a type of market that offered significant commercial profits in those years.

The idea was to create a motorbike with a body in order to have a vehicle that was equally as economical, but with the protection offered by a normal car.

The Isetta featured a distinctive "egg" shape, and was powered by the engine already fitted on the Isomoto 200, albeit increased to 236 cm3 with an aluminum cylinder and chromed cane.

In the meantime, the Bresso-based company produced the Iso 400, a small, more conventional car with a three-volume body that remained at the prototype stage.

[clarification needed] The real transition to passenger car production took place in 1962 with the public presentation of the Iso Rivolta IR 300, a luxury coupé designed by Bertone (through Giorgetto Giugiaro’s sketches) with a chassis developed by Eng.

With the start of sales in the United States and the signing of a stable powertrain contract with General Motors, the company began the production of a new lineup of models based on the GT 300 chassis (standard, extended or shortened).

Competition from prestigious brands, especially Maserati and Aston Martin (but also, for some models, Ferrari and Lamborghini), and the oil crisis of 1973, put Iso Rivolta in financial jeopardy.

The costs of managing the team, the drop in sales due to the economic and social crises in the first half of the 1970s and conditions in the U.S. market (where the company was late in obtaining the status of "Small Manufacturer", which applied less stringent sanctions standards) led to the end of car production on December 31, 1974.

In anticipation of the impact of the oil crisis on granturismo cars, the Rivolta family decided at the end of 1972 to partner with the ORSA company, a modest industrial plant founded by a small group of Sardinian entrepreneurs on the outskirts of Cagliari, equipped for the small-scale construction of retro-style open cars.

Since the Fiat 850, on whose chassis the Siata Spring was built, was no longer in production, an agreement was made with SEAT, which was still building it in Spain.

It was first placed on the Vision[2] concept car, created to race virtually in SONY PlayStation's GranTurismo and adopted by over 120,000 gamers.