Renzo Rivolta - engineer

Entrepreneur who invented the ‘bubble car’

Rivolta's Isetta filled a gap in the auto market
between motorcycles and scooters and cars

Renzo Rivolta, the businessman and engineer behind the ‘bubble car’ phenomenon of the 1950s, was born in Desio, a town in Lombardy about 20km (12 miles) north of Milan, on this day in 1908.

A visionary entrepreneur, Rivolta conceived the three-wheeled vehicle as a crossover between a motorcycle and a car, to bridge the gap in the market between conventional motorcycles and scooters and Italy’s cheapest car, the Fiat Topolino.

Named the Isetta, the car was essentially egg-shaped with just about room for two adults on the one seat. The nose section was also the access door, with a rack attached to the rear to carry a small amount of luggage. Because of its shape and bubble-like windows, it became known as a bubble car.

In the event, it was not particularly successful in Italy, yet it was a hit with buyers in other parts of Europe and in South America, where it was produced under licence.  

In Germany it is remembered as the car that saved BMW.  The company’s decision to invest in the Isetta, sold in Germany as the BMW Isetta 250, enabled a postwar recovery that was in serious doubt with the market in luxury cars slow to pick up.

Renzo Rivolta's business began
by manufacturing refrigerators

The first BMW Isettas rolled off the production line in 1955 and eventually more than 160,000 were sold. Isettas were built under licence in Argentina, Brazil, Spain, Belgium, France and the United Kingdom. Unlike the version produced in England, the German Isetta had four wheels as opposed to three, albeit with the rear two wheels positioned closer together than the front.

The car also sparked a rash of copies, with companies in Europe such as Messerschmitt, Heinkel, Vespa and Renault producing their own microcars. Britain’s roads saw the Peel P50, the Scootacar and the Bond Bug follow the trend, their popularity helped by road tax on three-wheelers being the same as for two-wheeled vehicles. 

Renzo Rivolta’s family in Desio were in the lumbar business. As a young man, as well as studying engineering, he had a passion for cars, motorcycles and speed boats, in all of which he raced. The Monza motor racing circuit was just a few kilometres from the family home.

One of his earliest business ventures, however, involved none of those things but refrigerators. In 1940, he bought a company called Isothermos, which had a factory just outside Genoa making heaters and chillers. When the factory was damaged in a bombing raid in 1942, he moved production to new premises at Bresso, a town now part of greater Milan.

Immediately after the end of the Second World War, Rivolta decided to devote his company to the production of Iso motorcycles and scooters, which buyers saw as an affordable and versatile means of getting around and offered significant commercial profits.

By 1953, he had changed the company’s name to Iso Autoveicoli and launched the Isetta, the success of which ultimately enabled Rivolta to pursue his ambition to produce high-performance sports cars. 

The Iso Grifo fulfilled Renzo Rivolta's dream
of moving into the performance car market

In collaboration with renowned designer Giorgetto Giugiaro, engineer Giotto Bizzarrini and coachbuilder Giovanni Bertone, Iso developed the Iso Grifo, a stunning grand tourer, which later led to the creation of the Bizzarini 5300 GT. 

Sadly, Renzo’s time to enjoy the trappings of his success was cut short when he died suddenly in 1966 at the age of 57.

He left a widow, Maria Aurelia Barberi (known as Marion), and two children, Attilia and Pier Attilio (known as Piero). Piero took over the running of the company, overseeing a period which saw the formation of the Iso-Rivolta-Marlboro Formula One team, managed by a young Frank Williams.

The Rivolta family sold the business in 1972, with car production ending two years later. Piero bought back the names Iso and Iso Rivolta, and after an initiative launched by the coachbuilder Zagato, a limited edition of a new sports car, the ISO Rivolta GTZ, was produced in 2019.

After success in a number of business projects, Piero and his family moved to Florida in 1980. In recent years, Pietro has devoted more of his time to writing novels and poetry, publishing eight books.

Renzo Rivolta's home in Bresso was the magnificent 
Villa Patellani, seen from Via Giulio Centurelli

Travel tip:

Bresso, situated a few kilometres north of the centre of Milan, is a charming suburban town with origins that can be traced back to the Roman era, when it was a small agricultural settlement known as Brissum. It remained a rural community until Milan experienced rapid industrialisation and urbanisation in the 20th century, when it began to attract commuters seeking a more affordable and less crowded lifestyle within easy reach of the city centre. Nonetheless, Bresso has a well preserved historic centre of narrow cobblestone streets, quaint squares, and traditional Lombard architecture.  Its oldest church, the Chiesa dei Santi Nazaro e Celso, dates back to the 15th century, while the modern Madonna della Misericordia, which was built in 1963, is shaped like Noah's ark. In 1939, Renzo Rivolta bought the Villa Patellani, a typical example of 18th-century Lombardy architecture, a reconstruction of a pre-existing 16th-century building. In 1942 it became part of the estate that incorporated the headquarters of his company, Isothermos, later Iso Autoveicoli. Part of the estate is now a community park, while one of the two surviving warehouse buildings now houses the municipality’s Post Office. 

The Basilica dei Santi Siro e Materno in Desio,
which was completed in 1744 and later enlarged

Travel tip:

Desio, where Rivolta was born, is a town of just under 21,000 people in the province of Monza and Brianza, which takes its name from the Latin ad decimum, meaning "at the 10th mile," referring to its location 10 Roman miles north of Milan. In 1277, it was the scene of a pivotal battle between the Visconti and della Torre families for the rule of Milan, won decisively by the Visconti, who would dominate the city until the mid-15th century. It is also the birthplace of Achille Ratti, who as Pope Pius XI was head of the Catholic Church between 1922 and 1939 and first sovereign of the independent Vatican City State upon its creation in 1929. His birthplace is now a museum dedicated to his life and legacy. The town is home to several notable churches, including the Basilica dei Santi Siro e Materno, which was consecrated upon its completion in 1744 and reconsecrated in 1895 following its enlargement and the addition of its dome.  

Also on this day: 

1533: The birth of philosopher Giacamo Zabarella

1568: The birth of poet and philosopher Tommaso Campanella

1901: The birth of politician Mario Scelba

1970: The birth of Paralympian Francesca Porcellato

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