Automobiles L. Rosengart
Defunct French automobile brand best known for small, economical cars derived initially from the Austin Seven.
Last updated October 14, 2026
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Overview
Automobiles L. Rosengart was a French automobile manufacturer and marque established by engineer and industrialist Lucien Rosengart. It became associated chiefly with compact, relatively affordable cars, although its range also included licensed versions of larger front-wheel-drive models and several ambitious postwar prototypes. The company emerged from Rosengart's earlier engineering activities and his interest in filling what he regarded as an underserved French market for very small cars. In 1923 he obtained a licence to manufacture the British Austin Seven. Working with engineer Jules Salomon, he acquired the former Bellanger factory on Paris's Boulevard de Dixmude, where automobile production began in 1927. The first Rosengart, the LR2, reached the market in 1928. The Austin-derived cars formed the commercial foundation of the business. The LR2 and its successors were compact, mechanically simple and promoted for reliability. Long-distance demonstrations and sporting-trial results helped establish the marque's reputation, while numerous body and chassis variants allowed Rosengart to address several niches without abandoning the small-car formula. From 1931 the range evolved into the LR4, commonly marketed as the Rosengart Cinq because of its five fiscal horsepower classification. The basic short-wheelbase architecture remained in production for many years, joined for a period by longer-wheelbase versions. The 1935 Supercinq added a more powerful engine through changes including an aluminium cylinder head, while retaining the compact dimensions that defined the marque. Rosengart broadened its portfolio during the early 1930s. Cooperation with Adler brought licence-built versions of the Trumpf and Trumpf Junior, both small front-wheel-drive cars. The company also developed more conventional rear-wheel-drive models and eventually moved upmarket with the Supertraction, introduced in 1937. The Supertraction was technically and stylistically more ambitious than the small cars and competed in a class occupied by larger French manufacturers. Its limited sales, however, illustrated the financial risks of moving beyond Rosengart's established economy-car position. The small cars achieved more satisfactory volumes, but their narrow margins made the business vulnerable to fixed costs and competition from larger manufacturers. Lucien Rosengart's financial difficulties led to the transfer of the business to Société Industrielle de l'Ouest Parisien, or SIOP, in 1936. The factory was destroyed by German forces after the invasion of France, and the company did not produce cars during the Second World War, although the business survived the occupation. Rosengart spent the war in exile in the United States and returned afterward to support a revival. The postwar market was increasingly dominated by major French manufacturers whose small cars benefited from stronger production scale and government industrial coordination. Rosengart was excluded from the Pons Plan, making access to materials and official permissions more difficult. The postwar range included the Vivor light van and break, a proposed Super 5, the large Supertrahuit prototype and, ultimately, the Ariette. The Vivor used the prewar LR4 concept and reached only modest production. The Supertrahuit attempted to reposition the marque as a specialist exporter, but its large Mercury-sourced V8 engine and uncertain production prospects limited its significance. The Ariette, launched in 1951, had a modern body by Philippe Charbonneaux and a four-seat layout, but its dated 747 cc engine delivered weak performance relative to its price. A break version and the simplified Artisane followed, yet neither solved the underlying problem of low-volume production and uncompetitive costs. SIOP entered bankruptcy shortly after the 1952 Paris Motor Show. The Neuilly plant closed temporarily with the loss of approximately 1,700 jobs, then reopened in 1953 after negotiations with creditors. Ariette production resumed at a very low rate, but the car remained difficult to price competitively. The company closed permanently in the summer of 1955 after failing to launch the Sagaie, an intended Ariette development using a flat-twin engine. Rosengart therefore remains a historical French marque whose strongest identity lies in compact cars and engineering adaptations rather than sustained mass production.
History
Lucien Rosengart was an engineer and businessman who had established an engineering enterprise at a young age. During the 1920s he identified demand for a very small French car and acquired a licence to build the Austin Seven in 1923. With engineer Jules Salomon, he purchased the former Bellanger plant in Paris. Production of the Rosengart LR2 began in 1927, and the car entered the market in 1928. The LR2 and later LR4 became the core of the marque. Their small size, simple mechanical layout and reputation for durability made them suitable for French buyers seeking economical transport. Rosengart supported the product with reliability demonstrations and sporting-trial participation. The LR4, introduced in modified form in 1931, was marketed as the Cinq and remained available in several configurations. The 1935 Supercinq brought additional power, while retaining the short-wheelbase concept. Longer-wheelbase derivatives were also offered for a limited period. During the early 1930s the company expanded through an agreement with Adler, producing versions of the Trumpf and Trumpf Junior. Rosengart also developed larger conventional cars and then the front-wheel-drive Supertraction, launched in 1937. These projects broadened the range but required investment that the company could not comfortably support. The compact cars sold more consistently, yet their low margins made profitability difficult. In 1936 financial pressure resulted in the transfer of the company to Société Industrielle de l'Ouest Parisien, which thereafter controlled the business and the Rosengart automotive operation. The Second World War interrupted production. The factory was destroyed by German forces during the invasion, and no cars were produced during the conflict. Rosengart survived the occupation, while Lucien Rosengart spent the war in the United States. After liberation he returned and attempted to restore the small-car business. The postwar environment was unfavorable: major French manufacturers were producing inexpensive compact cars at much greater scale, and the government-selected Pons Plan did not include Rosengart. Exclusion from the plan made access to materials, permissions and industrial resources more difficult. The postwar programme began with the Vivor, a light van and break based on the earlier LR4. Production was modest and ended in 1953. A Super 5 prototype was shown in 1946, followed in 1947 by the Supertrahuit, a large front-wheel-drive coupé and cabriolet powered by a Mercury-supplied V8. Rosengart hoped to be recognized as a specialist exporter, but the proposal did not secure a place in the Pons framework and the actual production scale of the Supertrahuit is uncertain. The Ariette, introduced in 1951, was the company's final significant production car. Its two-door, four-seat body was styled by Philippe Charbonneaux and gave the car a contemporary appearance. The underlying 747 cc engine, however, was an old design whose performance was weak against newer rivals. The Ariette break added carrying capacity, and the stripped-down Artisane attempted to address the price problem by removing trim and equipment. These measures did not overcome the cost disadvantage created by low production volumes and the large factory. SIOP was forced into bankruptcy after the 1952 Paris Motor Show. The Neuilly plant closed with approximately 1,700 jobs lost, although it reopened in early 1953 after negotiations with creditors. Ariette production resumed at only a few cars per day. The intended Sagaie, an Ariette development with a flat-twin engine, was never successfully launched. Rosengart ended operations in the summer of 1955, bringing to a close a small but technically varied chapter in French automobile history.
- 1955
Operations end
[1]The company closed after the planned Sagaie successor failed to reach production.
- 1952
SIOP bankruptcy and plant closure
[1]SIOP entered bankruptcy and the Neuilly plant temporarily closed, although it later resumed limited Ariette production.
- 1951
Ariette debuts
[1]The Ariette became the marque's final major production-car programme.
- 1947
Supertrahuit shown
[1]The company displayed coupé and cabriolet versions of a large V8-powered front-wheel-drive design.
- 1946
Super 5 prototype displayed
[1]Rosengart presented a postwar prototype at the Paris Motor Show.
- 1937
Supertraction introduced
[1]The company entered a larger and more prestigious segment with a front-wheel-drive model.
- 1936
Business transferred to SIOP
[1]Lucien Rosengart transferred the automobile business to Société Industrielle de l'Ouest Parisien after experiencing financial difficulties.
- 1935
Supercinq launched
[1]The Supercinq added a more powerful version of the 747 cc engine and was sold alongside the less expensive Cinq.
- 1931
LR4 / Cinq introduced
[1]The small car received substantial modifications and was marketed as the Rosengart Cinq.
- 1928
Rosengart LR2 reaches the market
[1]The first production model entered the French market as a compact Austin Seven-derived car.
Products and positioning
A French mass-market and economy-car marque that emphasized compact dimensions, low running costs and practical utility, while periodically attempting to move into more powerful or prestigious segments.
Small economy car · 1928
Rosengart LR2
The LR2 was Rosengart's first production automobile. Derived from the Austin Seven under licence, it used a compact layout suited to economical French motoring. It entered the market in 1928 after production had begun at the former Bellanger factory. The model was offered in multiple variants and was promoted particularly around reliability. Its small engine, short dimensions and low operating costs established the product identity that remained central to the marque through the prewar period.
Small economy car · 1931
Rosengart LR4 / Cinq
Introduced in 1931, the LR4 was more differentiated from its Austin origins than the LR2 while retaining the 747 cc engine and three-speed transmission. It was marketed as the Rosengart Cinq, a reference to its five fiscal horsepower classification. The compact short-wheelbase version remained the principal configuration, while longer-wheelbase derivatives were available for a limited period. Variants of the design continued into the postwar era.
Small economy car · 1935
Rosengart Supercinq
The Supercinq was a higher-output development of the small Rosengart platform introduced in 1935. Engine modifications, including an aluminium cylinder head, increased claimed power substantially over the original Cinq. Rosengart continued to sell the simpler Cinq beside it as a lower-cost alternative. Later versions included changes to tax classification and transmission, but the model retained the short wheelbase and compact mechanical concept that characterized the marque.
Front-wheel-drive passenger car · 1937
Rosengart Supertraction
The Supertraction was Rosengart's major prewar attempt to move above the small-car market. Introduced in 1937, it used front-wheel drive and competed with larger French cars such as the Peugeot 402 and Berliet Dauphine. The model represented a significant expansion in size, ambition and investment, but production remained limited and sales were insufficient to justify the resources committed. Its commercial difficulties contributed to the company's broader financial vulnerability.
Light commercial vehicle · 1946
Rosengart Vivor
The Vivor was a postwar light van based on the prewar LR4 concept. It was also available as a break-style utility vehicle with side windows behind the front doors. The approximately 400 kg class vehicle addressed practical carrying needs in the immediate postwar market, but production remained very small. Output peaked in 1951 and the Vivor programme ended in 1953.
Prototype passenger car · 1946
Rosengart Super 5
The Super 5 was a prototype displayed at the 1946 Paris Motor Show as part of Rosengart's effort to restart automobile production after the war. Lucien Rosengart supported the project, but SIOP's commitment was limited. The programme did not become a major production model, reflecting the company's difficulty in securing industrial support and competing with larger manufacturers in the postwar French market.
Specialist grand touring car · 1947
Rosengart Supertrahuit
The Supertrahuit was a large front-wheel-drive design shown in 1947 in coupé and cabriolet forms. Its name referred to front-wheel drive and an eight-cylinder engine. The cars used a large Mercury-supplied engine and were intended to support a possible specialist-export strategy. Although the design was considered elegant, there is no clear evidence that it achieved substantial series production or secured the government recognition the company sought.
Small family car · 1951
Rosengart Ariette
The Ariette was introduced in 1951 as Rosengart's final major production car. Styled by Philippe Charbonneaux, its modern two-door, four-seat body gave the small car a contemporary appearance. It retained a 747 cc engine, a four-speed gearbox and relatively light construction, but the engine's modest performance was increasingly uncompetitive. A break version offered greater load capacity, while the Ariette's price remained difficult to justify against newer mass-produced French rivals.
Simplified small family car · 1953
Rosengart Artisane
The Artisane was a stripped-down version of the Ariette introduced in 1953. It removed much of the chrome trim, wheel decoration and interior equipment, and was offered in a limited utilitarian specification. The strategy followed the broader industry trend toward cheaper basic cars, but the reduction in equipment could not fully compensate for Rosengart's structural cost disadvantage and very low production scale.
Planned small car
Rosengart Sagaie
The Sagaie was planned as an evolution of the Ariette using a flat-twin engine. It was intended to give the company a more competitive final product, but the project was not successfully launched before the factory closed. The failure of the Sagaie programme marked the end of Rosengart's attempt to remain an independent automobile producer.
Marketing campaigns
- 1928LR2 reliability promotion
France
Rosengart promoted the LR2 through endurance and sporting demonstrations. A widely cited long-distance run and strong results in trials were used to associate the small car with durability rather than merely low price.
Outcome. The activity helped establish a reliability-oriented reputation for the early Rosengart range.
Brand decisions
1953
Introduce the simplified ArtisaneStrategyBackground
The Ariette's price was difficult to defend against mass-produced rivals with comparable power.
Action taken
Rosengart removed trim and equipment to create a lower-cost Artisane version.
Aftermath
The simplification reduced the advertised price but did not resolve the company's low-volume economics before closure.
1951
Launch the ArietteProduct launchBackground
Rosengart needed a modern small car to re-enter a postwar market increasingly dominated by high-volume manufacturers.
Action taken
It introduced the Charbonneaux-styled Ariette with a four-seat body, 747 cc engine and four-speed transmission.
Aftermath
The contemporary styling was well received, but the dated engine and high price limited competitiveness.
1947
Pursue specialist-export positioningStrategyBackground
Rosengart was excluded from France's postwar Pons Plan and faced difficulty competing for materials and official support in the domestic market.
Action taken
Through the Supertrahuit, the company sought recognition as a specialist manufacturer focused on export sales.
Aftermath
The proposed repositioning did not secure inclusion in the plan, and the Supertrahuit did not become a substantial production programme.
1937
Enter the larger-car segment with SupertractionProduct launchBackground
Rosengart sought to supplement its small cars with a product capable of competing against established larger French automobiles.
Action taken
The company introduced the front-wheel-drive Supertraction.
Aftermath
Sales did not reach a level sufficient to justify the investment, reinforcing the company's dependence on low-margin compact cars.
1936
Transfer control to SIOPM&ABackground
Financial difficulties developed as the company supported both its low-margin small cars and more ambitious larger models.
Action taken
The automobile business was transferred to Société Industrielle de l'Ouest Parisien, while the Rosengart name continued to be used.
Aftermath
SIOP controlled the postwar company, while Lucien Rosengart progressively withdrew from day-to-day involvement.
1923
Adopt licensed Austin Seven productionStrategyBackground
Lucien Rosengart believed France lacked a sufficiently served market for very small cars and sought an established design rather than developing an entirely new car immediately.
Action taken
He obtained a licence to manufacture the Austin Seven and built the business around a French production programme.
Aftermath
The licensed design provided the technical foundation for the LR2 and the subsequent Cinq and Supercinq families.
Recent events
- 1955
Rosengart closes permanently[1]
Bankruptcy · Other
The company ceased operations after failing to launch the Sagaie, an intended successor derived from the Ariette.
- 1952
SIOP files for bankruptcy[1]
Bankruptcy
SIOP entered bankruptcy after the 1952 Paris Motor Show, temporarily closing the Neuilly plant and putting the marque's survival in doubt.
- 1951
Ariette introduced[1]
Product launch
The Ariette debuted as a modern-bodied small family car designed by Philippe Charbonneaux, but its older engine and high price weakened its market position.
- 1947
Supertrahuit prototypes displayed[1]
Product launch
Rosengart showed large front-wheel-drive coupé and cabriolet versions of the Supertrahuit, hoping to obtain specialist-export status under France's industrial plan.
- 1946
Rosengart presents the Super 5 prototype[1]
Product launch
The company displayed a new Super 5 prototype at the Paris Motor Show as part of its attempted postwar revival.
- 1940
Factory destroyed during the invasion of France[1]
Other
The factory was destroyed by German forces after the invasion, and automobile production stopped during the war.
- 1937
Supertraction expands the marque upward[1]
Product launch
Rosengart introduced the Supertraction, a larger front-wheel-drive model intended to compete beyond the company's traditional small-car segment.
- 1936
SIOP takes control of the business[1]
M&A
Financial problems led Lucien Rosengart to transfer the company to Société Industrielle de l'Ouest Parisien.
- 1931
The LR4 becomes the Rosengart Cinq[1]
Product generation
The Austin-derived small car was substantially modified and marketed under the Cinq name, preserving the marque's focus on compact economy motoring.
- 1927
Licensed Austin Seven production begins[1]
Product launch
Production of the Rosengart LR2 began at the former Bellanger factory before the model's public market launch in 1928.
Sources1 sources
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