For a while, it looked like the small displacement four-cylinder sportbike was headed for extinction. Emissions rules tightened, development costs climbed, and most manufacturers decided it simply wasn’t worth the effort. Twins were cheaper to build, easier to certify, and good enough for most riders. Outside of a few holdouts, the idea of a small screaming inline four started to feel like a relic of another era.
There was a time when sportbike lineups felt like a perfectly stacked ladder. Back in the glory days, brands like Yamaha, Honda, Suzuki, and Kawasaki each had serious four-cylinder machines in the 400, 600, 750, and 1000 classes. Riders could start on a smaller high-revving four-cylinder and work their way up as their skills and budget grew. Each step meant more power, sharper handling, and an engine that screamed a little louder near redline. It was a golden era for sportbikes, and for a lot of riders, it defined what performance motorcycling was supposed to feel like.
One of the last major reminders that the formula still had life left in it came from Japan with the Kawasaki Ninja ZX-4RR. That bike proved there was still real enthusiasm for compact four-cylinder sportbikes that rev to the moon and deliver big bike thrills without the intimidating size or price of a liter machine. But while the Japanese brands have largely focused elsewhere, another group of manufacturers has started pushing the idea forward.
Chinese brands are stepping into the gap.
Over the past few years, several Chinese manufacturers have been moving beyond basic commuter bikes and experimenting with higher-performance engines, more ambitious designs, and segments that bigger brands quietly abandoned. One of the most interesting outcomes of that shift is the sudden comeback of small-displacement four-cylinder sportbikes. And CFMoto is right in the middle of that movement.
The Chinese manufacturer has been expanding quickly in recent years, building a reputation for bikes that combine aggressive styling, strong specs, and relatively accessible pricing. With a rapidly growing global dealer network, CFMoto has been building out a full sportbike ladder that now covers almost every step in the performance spectrum.
At the entry level, you’ll find the 250SR and 300SR singles. Step up a bit, and there’s the 450SR twin. Above that sits the 675SR-R triple, which is already sold in the US as the 675SS. Moving higher still, CFMoto has introduced the 750SR-S inline four while teasing an eventual flagship V4 superbike called the V4 SR-RR.
But right in the middle of that lineup sits a machine that might end up being one of the most interesting of the bunch: The four-cylinder 500SR. That bike first appeared publicly in 2023 when CFMoto showed a camouflaged prototype at an event in China alongside the 675SR triple. The triple moved quickly into production. The four-cylinder project took a much more unusual route.
Instead of releasing the prototype design, CFMoto launched a neo retro version called the 500SR Voom in 2024. The bike looked nothing like the earlier prototype. Its front end featured two circular air intakes outlined with LED lighting, a visual nod to the round headlights that defined many sportbikes in the late 1980s and early 1990s. It was bold, quirky, and immediately recognizable in a segment where a lot of bikes are starting to look very similar.
The Voom is currently sold in China and a few export markets like Australia and the Philippines, where I'm from, though it hasn’t reached the United States or Europe yet.
But now the company appears to be circling back to the original concept. Type approval documents unearthed by our friends over at Cycle World reveal a more conventional version of the 500SR that drops the neo retro styling and instead adopts bodywork that matches the rest of CFMoto’s sportbike family.
Visually, the bike looks like a smaller sibling to the rest of the SR lineup. It carries the same checkmark-shaped LED running lights above reverse rake headlights, along with mirrors that have turn signals integrated directly into the housings. The fairings feature raised air guides designed to help manage airflow along the sides of the bike, while the tank and tail follow the same family styling language. Sure, it might not be quite as visually distinctive as the Voom, but it fits neatly into the rest of the SR lineup.
Under the bodywork, the two bikes are almost identical. The machine runs the same 499cc inline four engine that CFMoto claims produces 78 horsepower at 12,500 rpm and 36 pound-feet of torque at 10,000 rpm. Power goes through a six-speed gearbox paired with a slipper clutch. A quickshifter load sensor is visible in the linkage, which likely means upshift-only quickshifting just like the Voom.
The chassis carries over as well. Up front, there’s a 41 millimeter adjustable upside-down fork, while the rear uses a monoshock connected to a double-sided swingarm. The new version appears to use slightly different brake calipers and adds covers over the front brakes, but the core hardware remains the same.
Of course, the bigger question here is availability. And whether either the 500SR or its retro-cosplaying Voom sibling will ever reach the US remains unclear. Tariffs make it difficult for Chinese-built motorcycles to compete in the US, and in places where the 500SR Voom is already sold, it isn’t dramatically cheaper than the larger 675SR-R triple.
Still, the bigger story here isn’t just one bike. For years, the small displacement four-cylinder sportbike looked like it was fading away. Now it’s making a comeback, and companies like CFMoto are playing a major role in that shift.
For riders who grew up loving the sound of a screaming inline four but don’t necessarily want a full-blown liter bike, that comeback could mean more choices, more competition, and maybe a little bit of that high-revving magic returning to the sportbike world.
Source: Cycle World
