145-hp 500cc Two-Stroke Ethereal from Veloce Motorcycles…
In the modern world, a 500cc two-stroke intended for road use seems almost unthinkable. However, that’s exactly what Oxfordshire-based Veloce Motorcycles is promising with the Ethereal — a 500cc four-cylinder (L4) two-stroke with a claimed 145 horsepower at 12,000 rpm, laser-sintered expansion chambers, a radical transmission layout, and production limited to just 48 units.
If the 1000cc, eight-cylinder, 280-hp X8 Veloce Aperion we recently featured is the brand’s outrageous halo bike, then the Ethereal may prove to be the more focused rider’s machine. It’s still exotic, still a two-stroke, and still deeply unconventional, but it appears to be built around lightness, handling, and mass centralization as much as outright shock value. And in some ways, that makes it even more interesting.
The Smaller Sibling?
Calling the Ethereal the “small” Veloce seems absurd. Yes, it has half the displacement and cylinder count of the Aperion, but we’re still talking about a 500cc four-cylinder two-stroke producing 145 hp. In the context of modern production bikes, that’s nothing short of wild. It evokes the spirit of 500cc Grand Prix machinery — the era when the world’s best riders wrestled violent square-four and V4 smokers around the fastest circuits on earth.
Of course, the Ethereal is not a replica of a 1990s GP bike. Veloce is not simply reviving an old engine format and wrapping it in modern bodywork. Instead, the company appears to be using the inherent advantages of two-stroke design — compactness, simplicity, light weight, and power density — to rethink the layout of the whole motorcycle.
The result is one of the strangest and most fascinating boutique motorcycle projects currently in development.
The L4 Two-Stroke Engine
At the heart of the Ethereal is a 500cc four-cylinder two-stroke engine with the cylinders arranged in an L configuration. The company claims 145 hp along with a crankcase weight of just 6 kg, which rivals many GP machines, they say.
That crankcase figure is particularly striking. Weight saved anywhere on a motorcycle matters, but Veloce’s design philosophy seems focused on keeping mass low, compact, and centralized — reducing polar moment and helping the bike change direction more readily.
For two-stroke fans, the numbers alone are enough to stir the blood. A 500cc four-cylinder stroker making 145 hp sits in very serious territory. It might be less extreme than the Suter MMX 500 or the old premier-class GP machines, but it’s aimed at road use rather than a track-only fantasy. That’s exactly the kind of target that makes this project so compelling.
A Transmission Turned Inside Out
One of the Ethereal’s most unusual features is its transmission layout. Veloce says it has devised a new arrangement that places the input shaft and primary drive behind the output shaft. According to the company, this allows the output shaft to sit between the engine’s crankshafts, reducing overall mass and improving mass centralization — which also indicates the Ethereal is a twin-crank design like the Suzuki RG500 Gamma and Yamaha RZ500 rather than a conventional single-crank L/V-four.
In more familiar terms, the company has effectively reorganized the relationship between the engine, gearbox, and final drive in pursuit of better packaging and suspension geometry. Veloce says the swingarm fulcrum can axially align with the selector, creating an exceptionally stiff transmission-to-rear-suspension arrangement.
That may sound like engineering abstraction, but the goal is simple: put the important masses where they should be, align the forces more cleanly, and create a motorcycle that responds with less inertia and greater precision. In a world where many new motorcycles are defined by software, screens, and rider aids, the Ethereal seems like a return to deep mechanical problem-solving. The novelty here is not a riding mode. It is the shape of the machine itself.
Underseat Radiator, Tank Ducts, and Rearward Airflow
The Ethereal’s cooling system is another major departure from convention. Instead of mounting radiators in the usual frontal or side positions, Veloce has centered the machine around a specially developed underseat radiator. Air is drawn from the front of the bike, forced through channels in the fuel tank, and directed through the radiator beneath the seat. High-velocity air passing the trailing surfaces is then used to help pull air through the core and out the rear of the bike.
It is a layout that recalls the Benelli Tornado Tre’s famous tail-mounted radiator concept, but Veloce appears to be using the idea as part of a broader packaging strategy. Moving the radiator away from the front of the motorcycle can free up space, alter weight distribution, and open new possibilities for aerodynamics and chassis design.
Whether the system proves effective in real-world use remains to be seen, but as a piece of engineering theater, it is superb. The Ethereal’s cooling system doesn’t seem to be hidden away as an afterthought, but has become one of the central ideas around which the bike is built.
Laser-Sintered Expansion Chambers
Like the larger Aperion, the Ethereal uses a laser-sintered, all-alloy resonance exhaust system. For a two-stroke, the exhaust is not merely plumbing. Laser sintering is a form of metal additive manufacturing, essentially 3D-printing metal parts by using a laser to fuse fine alloy powder layer by layer. For a two-stroke exhaust, that can allow shapes far more intricate than traditional rolled-and-welded expansion chambers, helping package the tuned pipework tightly around the engine and chassis.
Of course, expansion chamber shape, length, volume, and cone profile are essential to power production. That has always made multi-cylinder two-strokes particularly challenging to package. A conventional four-stroke exhaust system can be complex, but a two-stroke’s chambers are fundamental to how the engine breathes.
By using metal additive manufacturing, Veloce can create compact, precise, complex exhaust forms that would be extremely difficult to fabricate through traditional cutting, rolling, and welding. On a motorcycle like the Ethereal, that matters enormously. The engine, transmission, cooling system, and chassis are already fighting for every millimeter of space. The exhaust is both a technical necessity and a visual signature. On the Ethereal, as on the Aperion, the pipes are part of the motorcycle’s identity.
A Modern Boutique Two-Stroke
The Ethereal arrives amid a small but fascinating modern two-stroke revival. Langen Motorcycles brought the high-end roadgoing two-stroke back into the conversation with its 249.5cc V-twin Two Stroke, while machines like the Ronax 500 and Suter MMX 500 have reminded us that the 500cc two-stroke still holds great sway over the imagination.
But the Ethereal seems to occupy a different space. The Ronax and Suter were rooted heavily in the mythology of 500cc Grand Prix racing. The Langen is a jewel-like lightweight road bike. The Ethereal, by contrast, is more of a clean-sheet engineering exercise: part sportbike, part concept machine, part boutique two-stroke renaissance project.
It is not retro in any simple sense. There is nostalgia in the sound, smell, and cylinder count, certainly, but the packaging and manufacturing methods are modern. The underseat radiator, reorganized transmission, laser-sintered exhaust, and ultra-light crankcase are not attempts to recreate the past. Rather, they seem to ask what a two-stroke motorcycle might become if a small company were free to ignore the assumptions of mass production.
Who Are Veloce Motorcycles?
Veloce Motorcycles is the trading name of Veloce Automotive Ltd, a private company based in Oxfordshire, England. The company says its powertrains and motorcycles are developed at its own engine shop and test circuit in Carmarthenshire, Wales.
The company drew major attention at the Bike Shed Show with the Aperion, a 1000cc X8 two-stroke roadster with eight cylinders and a claimed 280 hp. That bike is the obvious headline-grabber: bigger, louder, stranger, and more outrageous in every measurable way.
But the Ethereal may tell us more about Veloce’s broader ambitions. This is not merely a detuned or downsized version of the Aperion. It has its own architecture, its own cooling philosophy, its own transmission concept, and its own purpose. Veloce describes the Ethereal in terms of lightness, grace, and pace. That may sound poetic, but the mechanical ideas underneath are quite concrete.
Production and Road Use
Veloce says reservations are available for the Ethereal, with production strictly limited to 48 units. The company also says the bikes are to be MSVA-compliant for UK road use.
As with any ambitious startup motorcycle project, a measure of caution is warranted. It is one thing to announce a radical boutique two-stroke; it is another to deliver finished, running, road-registered motorcycles to customers. The path from prototype to production is difficult even for established manufacturers, and far more so for small companies attempting unusual engine and chassis layouts.
Still, that is part of what makes the Ethereal exciting. The easy thing would be to build another electric concept, another restyled parallel twin, or another retro roadster with familiar hardware. Veloce is aiming at something far stranger and more mechanically imaginative.
Veloce Ethereal Specs
Model: Veloce Ethereal
Manufacturer: Veloce Motorcycles
Location: Oxfordshire, England
Engine: 500cc four-cylinder two-stroke
Configuration: L configuration
Claimed Power: 145 hp @ 12,000 rpm
Crankcase Weight: 6 kg
Exhaust: Laser-sintered all-alloy resonance exhaust system
Cooling: Underseat radiator with front-fed ducting through the fuel tank
Transmission Layout: Input shaft and primary drive positioned behind the output shaft
Design Aim: Reduced mass, improved mass centralization, optimized swingarm / drivetrain geometry
Production: Limited to 48 units
Reservations: Available, according to Veloce
UK Road Use: Intended to be MSVA-compliant, according to Veloce
Do We Need a Road-Going 500cc Two-Stroke?
The world might not need a 500cc, four-cylinder, road-going two-stroke, but in a world of mass production and two-wheeled pragmatism, we love to see a machine breaking the mold. The Ethereal certainly isn’t a machine created by committee, and we’re supportive of engineers and builders who would rather create something difficult and improbable than something safe and ordinary.
The Ethereal could be seen as a statement that the two-stroke still has unexplored potential — not as a cheap commuter engine or a relic of GP history, but as the foundation for a modern, lightweight, high-performance road machine. Whether Veloce can bring the Ethereal (and Aperion) to production remains to be seen. But the concept alone is enough to make the two-stroke faithful sit up straight. A 145-hp, 500cc, four-cylinder stroker with an underseat radiator, laser-sintered chambers, and a gearbox layout turned inside out? Yes, please.
