DKW

A Danish Engineer's Failed Steam Car

Start with the name, because it tells you almost everything about the company's character. In 1916, a Danish engineer named Jørgen Skafte Rasmussen set up a factory in Zschopau, in Saxony, to make steam fittings. Rasmussen wasn't content with fittings, though, and soon tried building a steam-powered car, which in German is a Dampfkraftwagen. It didn't work. But the initials stuck around, waiting for something worth attaching them to.

That something arrived a few years later, almost as a joke. In 1919 Rasmussen started producing small two-stroke toy engines, marketed under the name des Knaben Wunsch — "the boy's wish." He then dropped a slightly modified version of that little engine into a bicycle frame and called the result das kleine Wunder, "the little wonder." The initials DKW, which had meant nothing in particular, now meant this: a cheap, simple, two-stroke-powered machine that ordinary people could afford to ride. By the late 1920s, that little wonder had made DKW the largest motorcycle manufacturer in the world.

From Motorized Bicycles to a Trademark

Rasmussen began building motorized bicycles in 1921, and by then the DKW name was already functioning as a company identity rather than a slogan. It became a registered trademark in 1922. The early machines that mattered most were the E206, introduced in 1925 with a 206cc two-stroke single, and the related 198cc E200 — unglamorous, reliable bikes that sold in numbers and established the pattern DKW would follow for the next two decades: keep it simple, keep it two-stroke, keep it cheap enough for a working man to buy.

Much of the engineering behind that early success belonged to Hugo Rupp, an engineer and automobile pioneer born in Apolda in 1879, who helped shape DKW's two-stroke designs through the 1920s. The firm also raced water-cooled two-strokes in the 175cc and 250cc classes during this period, using a supercharging arrangement known as Ladepump to squeeze more performance out of small engines — an early sign that DKW's engineers were never quite satisfied with leaving the two-stroke as a simple thing. In 1924, DKW bought Slaby-Beringer, a firm that had built a small electric runabout, and brought its chief engineer Rudolf Slaby into the fold, broadening the company's ambitions beyond motorcycles even at this early stage.

The Two-Stroke Laboratory of the 1930s

By the 1930s DKW was turning out more than 60,000 motorcycles a year and offering everything from 98cc runabouts up to 500cc twins, including an air-cooled twin-cylinder model with electric starting — a genuine novelty at the time. But the real significance of this period lies less in sales figures than in engineering. It's fair to say the DKW designs of the 1930s were the most important body of work in the entire history of the two-stroke engine. Rotary disc intake valves, flexible reed valves that responded to internal pressure changes, forced induction schemes — nearly every important idea that would define two-stroke engineering for the rest of the century traces back to work done at DKW before the war.

Much of that work centered on the split-single racing engine, a design credited to Arnold Zoller, which gave DKW a real edge in the Lightweight and Junior racing classes. The same engineering culture produced the extraordinary supercharged racers of the era — machines built around paired "twin-cylinder" split-single arrangements that were, by the standards of the day, marvels of mechanical complication. They won races across Europe, including at the Isle of Man.

Racing: Kluge, the Split-Single, and the Singing Saw

DKW's competition record before the war rested heavily on the split-single racers and a small stable of gifted riders. Ewald Kluge won the 1938 Isle of Man Lightweight TT on a DKW, and by most accounts this made him the first German rider to win at the Island, though sources differ on the details of that ride, including the winning average, so those specifics are best left unstated. Riders including Arthur Geiss, Walfried Winkler, Toni Bauhofer, H. P. Müller, and Siegfried Wünsche added to DKW's competition record through the late 1930s, both on tarmac and in off-road events like the International Six Days Trial. One name stands out for reasons beyond motorcycling: Bernd Rosemeyer, who raced DKWs before moving on to drive Auto Union's Grand Prix cars.

The war interrupted everything, but DKW came back into competition quickly. Siegfried Wünsche, a former factory rider, took the German 350cc championship in 1949, following DKW wins in the 125 and 250cc German championship classes in 1948 and 1949. Then, for the 1952 season, DKW's engineers produced something genuinely strange: a 350cc three-cylinder two-stroke racing engine making 38 horsepower at 12,500 rpm, its exhaust note distinctive enough that people nicknamed the bike the "singing saw." The engine had been designed by Eric Wolf and was later developed further by Helmut Görg. DKW ended its official factory racing program in the autumn of 1956, closing out a competition history that stretched back to the 1920s — a record that, while impressive by any account, is best described in general terms rather than with a precise tally of championships, since that figure isn't reliably confirmed.

The RT125: DKW's Most Copied Idea

If DKW is remembered for one motorcycle above all others, it's the RT125, which first appeared in 1939. It was a modest thing on paper — a small two-stroke single — but its design proved so sound and so easy to replicate that it became, arguably, the most copied motorcycle blueprint of the 20th century. Versions and derivatives of the RT125 turned up as war reparations and licensed designs across the postwar world: the BSA Bantam in Britain, the Harley-Davidson Hummer in America, the Soviet Moskva, and Yamaha's first motorcycle, the YA-1, all trace their lineage back to this one small Zschopau design. Few motorcycles from any manufacturer have echoed so widely through other companies' model ranges.

After the war, DKW built on that formula with a range of air-cooled twin-cylinder machines in 200cc, 250cc, and 350cc displacements, alongside continued production of small singles. The NZ350 had served as a military motorcycle during the war years, and postwar civilian models like the Junior, Junior de Luxe, and F12 carried the DKW name through the 1950s and into the 1960s, aimed squarely at riders who wanted DKW's traditional virtues of simplicity and affordability rather than outright performance.

Zschopau Lost, Ingolstadt Gained

The defining structural event in DKW's history came in 1932, when the company merged with Audi, Horch, and Wanderer to form Auto Union. DKW was very much a senior partner in that arrangement, not a junior one, and for a while things went on much as before. But the Second World War redrew the map in a way no engineer could design around. The original DKW factory at Zschopau ended up in Saxony, which became part of East Germany, sealed behind what Winston Churchill called the Iron Curtain. That factory carried on producing motorcycles, but under new ownership and new names — first IFA, later the well-known MZ marque.

DKW itself relocated west, to Ingolstadt in Bavaria, where Auto Union was rebuilding its business. From there, the DKW name continued on single-cylinder 125cc motorcycles, 250cc and 350cc twins, and small two-stroke-powered cars through the 1950s. DKW motorcycle production came to an end in 1959, when the Auto Union group made the decision to stop building motorcycles entirely — moped manufacture continued a while longer, but the DKW motorcycle, in the form riders had known it for decades, was finished. Auto Union came under Daimler-Benz ownership around this period (sources differ slightly on whether the decisive year was 1957 or 1958), and Volkswagen Group acquired Auto Union in 1964. The DKW motorcycle operations that remained were folded into Zweirad Union AG, a combine formed with Victoria and Express Werke, which was itself bought by Fichtel & Sachs in 1963 and merged with Hercules. When Volkswagen revived the Audi name in 1966, DKW production, on the car side as well, came to an end.

What's Left, and What It's Worth

DKW no longer exists as a motorcycle manufacturer, and hasn't for decades. What survives is the name's outsized influence on everyone else's small two-strokes, and a modest but genuine following among collectors. DKWs don't command the prices or attention that some contemporary marques do — among AHRMA racers and vintage collectors generally, they sit fairly low on the desirability list, and a good unrestored example can often be found for not much more than a couple thousand dollars. There are exceptions: a 1965 DKW Kavalier sold for $30,000 in March 2024, a reminder that the right model in the right condition can still surprise people.

The RT125 remains the model collectors and historians talk about most, along with postwar variants like the RT 125/2, and certain trim specials such as the F12 Luxus draw attention from car-side collectors of the DKW badge as well. None of it adds up to blue-chip status. What it does add up to is a quiet acknowledgment that a small factory in Saxony, working almost entirely in two-stroke singles and twins, shaped more of the postwar motorcycle world than its modest reputation today would suggest.