Nimbus
A Vacuum Cleaner Salesman's Grudge Against a Motorcycle
The story goes that Peder A. Fisker was standing on a street in Copenhagen sometime around 1918 when a motorcycle rattled past him — most likely a Belgian FN. Fisker had no particular love of motorcycles up to that point. What he had was an engineer's temperament, and something about the machine's construction irritated him enough that he decided he could design a better one himself. That mixture of pride and stubbornness is as good an origin point as any for Nimbus, a marque that would go on to become one of the more distinctive footnotes in European motorcycling.
Fisker was not a motorcycle man by trade. Along with his partner Hans Marius Nielsen, he had founded a company in Copenhagen in 1906 called Fisker & Nielsen, building electric motors and tools. By around 1910 the firm was producing some of the first electric vacuum cleaners in Europe — the beginning of what would eventually become Nilfisk, a name still recognized today far beyond Denmark. Motorcycles were, in a very real sense, a detour. But it was a detour Fisker pursued with the same engineering conviction he brought to everything else, and by 1918 he had a prototype running.
The Stovepipe Years
Mass production started in 1920, once Fisker & Nielsen had been reorganized as a limited liability company. The motorcycle that resulted was unlike anything else coming out of Denmark, or much of Europe for that matter: a 746cc four-cylinder engine with shaft drive, wrapped in a frame whose backbone doubled as the fuel tank. That backbone was thick and cylindrical enough that the machine picked up the nickname "Stovepipe," a name that has stuck to this day. By most accounts, the original model A/B, produced from 1919 to 1923, is what earned that nickname, with the model B of 1924-27 essentially the same machine fitted with an improved front fork — though the exact model designations of those early years are debated among historians and club members.
Fisker did not simply build the thing and hope for the best. He rode it himself, entering trials and long-distance races to prove the design under real conditions. The results backed him up: a Nimbus won the 1,300-kilometer Paris-Copenhagen race in 1921, and the following year a tuned example took first place in the grueling Odense-Berlin-Odense run, reportedly touching 140 km/h while returning fuel economy that would embarrass some machines built decades later. For a small Danish manufacturer with no prior motorcycle pedigree, this was a serious statement.
It didn't last. A Danish sales tax on motorcycles introduced in 1924, combined with a broader economic downturn, squeezed demand hard enough that production wound down starting in 1926, after roughly 1,300 machines had been built. There is conflicting information about exactly when the line went fully quiet, with some accounts pointing to 1928, but whichever year marks the true end, the practical result was the same: Fisker & Nielsen turned its attention back to vacuum cleaners and let the motorcycle side go dormant for the better part of a decade.
The Bumblebee Era
Motorcycles came back into the picture through the next generation. Anders Fisker, Peder's son, earned his engineering degree in 1932 and joined his father in reworking the old Stovepipe concept from the ground up. What emerged in 1934 was the Type C — a genuinely new design that kept the shaft drive philosophy but wrapped it around a fresh overhead-valve, overhead-cam engine producing 18 horsepower (later bumped to 22), mounted in a frame made from riveted steel strips rather than tubing. It was an unusual way to build a motorcycle frame, and it gave the Type C a look all its own.
The front end used telescopic forks, adopted a year ahead of BMW's R12. It's a comparison worth being precise about, though: BMW's fork had hydraulic damping from the start, while the Nimbus didn't gain damping until 1939. Being first with an idea and being first to perfect it are two different things, and Fisker & Nielsen's engineers knew it.
What customers actually noticed was the sound. The Type C's exhaust produced a distinctive buzzing hum, and Danes started calling it the Humlebien — the Bumblebee. The first customer took delivery in the summer of 1934, and from there the bike became, by a wide margin, the best-selling motorcycle in Denmark, moved through a dealer network that clearly knew how to sell it. Over the roughly twenty-five years the Type C stayed in production, Fisker & Nielsen built more than 12,000 of them. A substantial share, something on the order of a quarter to a third, went to institutional buyers: the Danish military, police, and postal service. The Danish Army alone accounted for around a fifth of total production, and the postal service kept its Nimbuses running on delivery routes as late as 1972 — long after the factory itself had stopped building them.
The German occupation of Denmark from 1940 to 1945 hit production hard, as raw materials became difficult to source; only around 600 machines were built during those war years. That the company kept building any motorcycles at all under occupation says something about how embedded the Type C had become in Danish daily life.
Racing and Reputation
The Type C was never conceived as a racing motorcycle, and Fisker & Nielsen didn't market it as one. But Danes raced what they had, and the Bumblebee saw plenty of competition use within Denmark, along with events in Sweden, Norway, Germany, and elsewhere. The company's own test rider, Josef Koch, became closely associated with the marque's competition and promotional appearances, putting Type Cs through trials and demonstrations that did as much for the brand's reputation as any advertisement could. This built on a habit the company had established from the very beginning — Peder Fisker himself racing the original Stovepipe in the early 1920s set the tone for a marque that preferred to prove itself in public rather than just on paper.
The End of the Line, and a Long Silence
By the late 1950s, the practical logic that had made the Nimbus attractive for decades — dependable, shaft-driven, well suited to sidecar duty — was working against it. Cheap cars, the Volkswagen Beetle chief among them, were pulling buyers away from utilitarian motorcycles and sidecar rigs. More agile competitors from Ariel and Zündapp were also eating into the market. Nimbus production came to an end in 1959, when the company completed its final contract with the Danish army. It was a quiet close for a motorcycle that had spent a quarter-century as something close to a national default choice.
After that, the rights to the Nimbus name and its technology passed to Nilfisk-Advance, the corporate descendant of the original vacuum cleaner business — a tidy bit of symmetry, given how the whole story started. For decades the name sat unused, a piece of Danish industrial history rather than an active brand.
Ownership, Survival, and a Fanbase That Never Left
What kept Nimbus alive in the intervening years wasn't corporate strategy — it was owners. The classic Stovepipes and Bumblebees have long enjoyed a devoted following in Denmark and across Northern Europe. Current estimates suggest something in the range of 3,800 to 4,000 Nimbuses remain registered for road use in Denmark alone, with a broader worldwide population, including unregistered and static machines, likely somewhere between 6,500 and 7,000. Restoration specialists such as Aarhus Nimbus continue to keep parts and expertise flowing to that community, which says a good deal about how seriously Danish enthusiasts take these machines.
The name itself stayed dormant until 2014, when a Danish entrepreneur named Claus Støvlbæk Clausen decided the Nimbus name deserved to be more than a museum piece. He approached Nilfisk-Advance and came away with the trademark and technology rights. That first arrangement didn't hold, and the rights lapsed before Clausen returned to the table; in March 2020 he secured a fresh licensing agreement to use the Nimbus name going forward, reportedly running 25 years, putting the revival on firmer legal footing than it had enjoyed the first time around.
Nimbus Today
The current Nimbus project is an electric motorcycle venture, built around a machine called the Type E, styled with an obvious nod to the original Type C's proportions and character even as the mechanicals are entirely modern. Clausen worked with the design firm 3Part to translate the Bumblebee's silhouette into something that runs on batteries rather than a shaft-driven four-cylinder engine. The company has pursued public share offerings to fund the move from prototype to production, seeking capital in the range of 8 to 10 million Danish krone to push both an e-bicycle and the electric motorcycle toward market.
It's a fitting environment for the attempt. Denmark has one of the highest rates of electric vehicle adoption anywhere in Europe, and the Type C still holds a genuine place of affection in Danish popular memory — the kind of recognition that a revival project can actually build on rather than having to manufacture from scratch. Whether the Type E carves out anything like the market position the Bumblebee once held remains an open question. But the fact that the Nimbus name is on a showroom floor again, in any form, would probably have satisfied the engineer who started all of this because a motorcycle he saw on a Copenhagen street annoyed him.