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Germany’s forgotten cars are rarely forgotten for lack of ideas: many were too early, specialized, expensive, or unconventional for ordinary buyers. From the tiny BMW Isetta to the experimental Mercedes-Benz C 111 and the production Volkswagen XL1, these ten vehicles show how far German manufacturers were willing to push engineering—and why technical originality did not always guarantee commercial success.
This list includes eight production cars and two unusual experiments: the Messerschmitt KR200 and Mercedes-Benz C 111. The C 111 was never a production car, while several of the others were limited or niche models rather than forgotten failures.
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At a glance: ten unusual German cars
| Car | What made it unusual | Status |
|---|---|---|
| BMW Isetta | Front-entry door and motorcycle-derived engine | Production car |
| Messerschmitt KR200 | Tandem seating and aircraft-like cabin | Production microcar |
| Zündapp Janus | Back-to-back seating and doors at both ends | Production car |
| NSU Wankel Spider | First production car with a Wankel rotary engine | Production car |
| NSU Ro 80 | Aerodynamic sedan with a twin-rotor engine | Production car |
| Porsche 914 | Volkswagen-Porsche partnership and mid-engine layout | Production sports car |
| Mercedes-Benz C 111 | Gullwing experimental rotary and record-car program | Experimental vehicle; not sold to the public |
| BMW Z1 | Doors that retract vertically into the body | Limited-series production car |
| Audi A2 | Aluminum body and exceptional efficiency focus | Production compact car |
| Volkswagen XL1 | Carbon-fiber plug-in hybrid built for extreme efficiency | Limited-series production car |
1. BMW Isetta: the refrigerator-door BMW
The BMW Isetta looked more like a bubble on wheels than a conventional car, but it played a serious role in BMW’s postwar history. BMW licensed the design from Italian manufacturer Iso and adapted it for German production, replacing the original two-stroke concept with a single-cylinder four-stroke engine derived from a BMW motorcycle.
Its most striking feature was the front door, which opened with the steering wheel to let occupants climb in. BMW Group Classic records production from 1955 to 1962; BMW gives a total of 161,728 cars. The Isetta was offered with 250- and 300-cc engines and helped BMW through a difficult period as demand for motorcycles declined and expensive luxury cars struggled. BMW Group Classic and BMW’s historical account document its development and production.
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2. Messerschmitt KR200: an aircraft company’s cabin scooter
Designed by aircraft engineer Fritz Fend and built at Messerschmitt’s factory, the KR200 brought aircraft-like thinking to postwar personal transport. It was a three-wheeled microcar with tandem seating, a transparent canopy, and a narrow body that made it instantly recognizable.
The KR200 belongs in a list of strange German cars not because it was a conventional small car, but because it blurred the boundaries between car, motorcycle, and aircraft cabin. Lane Motor Museum describes its three-wheel layout and the aircraft-engineering background behind the design. Lane Motor Museum’s KR200 overview provides further details.
3. Zündapp Janus: passengers facing both ways
The Zündapp Janus was the motorcycle maker’s only series-produced automobile. Its unusual cabin placed occupants back-to-back, with access doors at the front and rear. The arrangement inspired the Janus name, after the two-faced Roman god.
It was built from 1957 to 1959, and the Nuremberg Museum of Industrial Culture reports fewer than 7,000 examples. The Janus shows the limits of clever packaging: its layout made it memorable, but novelty alone could not secure a long future for a motorcycle manufacturer’s entry into the small-car market. The Nuremberg Museum of Industrial Culture and the Zündapp Museum document the car’s place in the company’s history.
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4. NSU Wankel Spider: the first production rotary car
Unveiled at the 1963 Frankfurt motor show, the NSU Wankel Spider became the world’s first production car powered by a single-rotor Wankel engine. Under its Bertone-designed open two-seat body sat a 497-cc rotary engine—a striking difference from the piston engines used by most cars of its time.
Audi Tradition records that NSU built exactly 2,375 Spiders by July 1967. The Spider is important as an engineering milestone rather than a sales sensation: it took the rotary idea from experimentation into a customer car and paved the way for the later Ro 80. Audi Tradition’s Wankel Spider history covers its design and production.
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5. NSU Ro 80: a futuristic rotary sedan
The NSU Ro 80 debuted at the 1967 Frankfurt motor show with a sleek, aerodynamic body, front-wheel drive, semi-automatic transmission operation, and a twin-rotor Wankel engine. Its design and engineering made it look far ahead of many family sedans of the period.
Audi identifies the Ro 80 as the first German car to win European Car of the Year. Production ended in April 1977. The rotary engine’s durability and warranty problems complicated the car’s reputation, but the Ro 80 remains a landmark example of an ambitious design brought to market. Its name combined “Ro,” referring to the rotary-piston engine, with the type designation “80.” Audi’s Ro 80 history gives its production and award details.
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The Porsche 914 was jointly developed by Volkswagen and Porsche and presented in 1969. Its mid-engine layout set it apart from more familiar sports cars, while its joint-brand identity made it an unusual fit in Porsche’s lineup. Four-cylinder versions used Volkswagen power; the 914/6 used a Porsche flat-six.
This is not a story of a commercial failure. Porsche reports 115,631 four-cylinder cars built from 1969 to 1975 and 3,338 914/6 examples from 1969 to 1972. The 914 sold well, especially in the United States, but its shape and shared Volkswagen origins have often left it in the shadow of more conventionally styled Porsches. Porsche describes it as the first German manufacturer’s production mid-engine sports car. Porsche’s historical archive provides its development and production context.
7. Mercedes-Benz C 111: a gullwing rotary laboratory
The Mercedes-Benz C 111 was an experimental vehicle, not a production car. Introduced as a research-car program beginning in 1969, it combined a dramatic wedge shape and gullwing doors with rotary-engine experiments. The C 111-II, shown in 1970, used a three-rotor Wankel engine; later development also explored a 4.5-liter V8 and diesel record-car work.
Despite public interest and reported purchase offers, Mercedes-Benz never put the C 111 into series production. Its purpose was to test ideas, not to serve customers. That makes it one of Germany’s most memorable road-going laboratories rather than a forgotten showroom model. Mercedes-Benz’s C 111 history explains its experimental role and confirms it never entered series production.
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8. BMW Z1: the roadster with disappearing doors
BMW developed the Z1 through its Technik GmbH as a study in reviving the roadster tradition. Its defining doors dropped vertically into the body instead of swinging outward, and its thermoplastic body panels could be removed. The result looked like a concept car even in ordinary traffic.
BMW Group Classic records production from 1988 to 1991, with a small series of 8,000 cars. The Z1 used an inline six-cylinder engine producing 170 hp and had a recorded top speed of 225 km/h. Its unusual design made it a striking limited-series experiment, even though it was not a practical template for high-volume production. BMW Group Classic’s Z1 entry lists its specifications and production details.
9. Audi A2: the aluminum space capsule
The Audi A2 paired an unusual tall, narrow shape with an advanced aluminum structure and a strong focus on efficiency. Audi presented it at the 1999 Frankfurt motor show and produced it from 2000 to 2005. Audi calls it the first compact car in recent automotive history with an all-aluminum body.
Audi records total production of 176,377 cars. The A2 1.2 TDI was the first four-door car with a claimed consumption figure of three liters per 100 km; Audi lists its combined figure as 2.99 liters per 100 km and its drag coefficient as 0.25. These are manufacturer figures, not a promise of real-world consumption for every driver. Sales fell short of expectations, and production ended after roughly five years. Audi’s A2 history provides the production and technical figures.
10. Volkswagen XL1: the one-liter car that reached production
The Volkswagen XL1 turned extreme efficiency into a limited-production road car. Produced from 2014 to 2016, it paired a 0.8-liter two-cylinder TDI diesel engine with an electric motor, a seven-speed DSG transmission, and a carbon-fiber-reinforced plastic body. Its two-seat packaging, covered rear wheels, camera-based mirrors, and wing doors made it look like a science project that had escaped onto the road.
Volkswagen’s archive records a limited run of 200 hand-built cars. It gives a drag coefficient around 0.186–0.189, claimed CO₂ emissions of 21 g/km, and electric driving of up to 50 km under the cited test conditions. Treat the official fuel-economy and emissions figures as test-cycle results, not universal real-world promises. Volkswagen’s XL1 archive details its specifications and production run.
Why these German cars are easy to overlook
These cars did not share one kind of fate. The Isetta was significant to BMW’s survival; the Porsche 914 achieved substantial production; the Ro 80 and A2 were real production cars with distinctive engineering; and the C 111 was never intended for public sale. Some were niche products, some were experiments, and some simply do not fit the familiar image of German motoring.
Their common thread is the willingness to explore a specific problem through unusual engineering: affordable postwar mobility, a new engine type, mid-engine sports-car packaging, low weight, or extreme fuel efficiency. Their stories are a reminder that technical ambition and commercial success are not the same thing.
FAQ
Was the Mercedes-Benz C 111 a production car?
No. Mercedes-Benz describes the C 111 as an experimental research-vehicle series. Despite interest from the public, it was never sold as a production model.
Did BMW design the original Isetta?
No. The design originated with Italian manufacturer Iso. BMW licensed it and adapted it for German production, including replacing the original engine concept with a BMW motorcycle-derived four-stroke.
Was the Porsche 914 a commercial failure?
No. Porsche reports 115,631 four-cylinder 914s and 3,338 914/6 cars built. Its joint Volkswagen-Porsche identity and unconventional styling make it an unusual entry, but it should not be described as a failure.
How many BMW Z1s were built?
BMW Group Classic records a small series of 8,000 Z1s, produced from 1988 to 1991.
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Are the Audi A2 and Volkswagen XL1 economy figures real-world guarantees?
No. The cited consumption and emissions values are manufacturer or official test-cycle figures. Actual results can vary with conditions and use.
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