Triumph Street Triple 798: what we know so far

For the 2019 season Triumph took the Street Triple's 765 cc engine and turned it into a Moto2 race engine. For 2027 it worked the other way round: the race engine came first, and the road bike follows. That road bike is the Street Triple 798.

In early October Triumph published the first images and named the date of the full reveal: 17 November. Until then, plenty of numbers are circulating that the factory never gave. Below we separate what is confirmed from what is guesswork.

In short: a new 798 cc triple, a new frame and swingarm, an exhaust under the engine and a single central LED headlight. Power, weight and price have not been announced.

What Triumph has confirmed

• Engine. A 798 cc three-cylinder replaces the 765 cc unit the Street Triple has used since 2017.
• Origin. It comes out of the development work Triumph did for the 2027 Moto2 World Championship.
• Chassis. The frame and swingarm are new, and the rear suspension layout is revised.
• Exhaust. The system now sits under the engine.
• Styling. A single central LED projector, ringed by daytime running lights, replaces the twin headlights.
• Character. Triumph calls it the most performance-focused Street Triple so far.
• Dates. The full reveal is on 17 November. The bike will also be shown at EICMA in Milan and Motorcycle Live in Birmingham.

An engine built for the track first

Triumph has said almost nothing about the road engine yet. It did describe the 2027 Moto2 engine in detail in August, ahead of the British Grand Prix at Silverstone:

• a new cylinder head, a low-inertia valvetrain and higher-flow ports;
• a new combustion chamber and a higher compression ratio;
• more torque across the rev range;
• redesigned crankcases and internals;
• around 6% more peak power and 2 kg less weight than the outgoing race engine.

Triumph says the design draws on nearly two million kilometres of racing since 2019.

One caveat matters here: all of this describes the race engine. Triumph has not said how much of it carries over to the road version.

798 is a familiar number. A triple of exactly this capacity already powers the Tiger Sport 800 and Trident 800, where it makes 115 PS. In August Triumph's Chief Product Officer Steve Sargent told Visordown that the new Moto2 engine is not based on that unit. How the Street Triple's 798 differs from those two should become clear on 17 November.

What we still don't know

• Power and torque. No official figure exists. Visordown reports the race engine rising from about 142 to about 150 bhp, and nobody expects the road bike to match that. Cycle News considers 135-140 hp realistic. For reference, the current Street Triple 765 RS makes 130 PS (128 bhp).
• Weight. The current RS weighs 188 kg wet. What the new frame and exhaust do to that figure is unknown.
• Versions and price. Whether the R and RS split continues is not confirmed. Neither is pricing.
• Components. The photos show Brembo radial calipers and a Showa fork. No official specification has been published.

Anything that promises more than this list is speculation for now.

Our take

Peak power was never the Street Triple's main strength. It was light, precise and equally at home in the city and on a track day. So on 17 November we will look at two numbers first: weight, and torque in the midrange.

If the new frame and underslung exhaust add no weight and the extra capacity fills out the midrange, the 798 becomes the new reference among middleweight nakeds. If the weight goes up, the 765 RS will stay the benchmark for a good while longer.

One practical note for Georgia: since 1 September, noise is measured at the roadside. When buying a new bike, check the noise values in its CoC, and read the noise check rules before swapping the stock exhaust.

What happens next

On 17 November Triumph will publish the full specification, versions and prices. We will update this article with the real numbers after the reveal.

If you are looking for a naked right now, browse motorcycle listings on MCG Market.

Sources

• Cycle News: first Street Triple 798 images, official photos, reveal date and power estimate;
• Visordown: Triumph's 2027 models, observations from the photos;
• MotoGP.com: the new Moto2 engine for 2027, technical changes to the race engine;
• Visordown: interview with Steve Sargent, on the Moto2 engine and the Tiger Sport 800;
• Motorcycles.news: Triumph's 2027 line-up, dates and open questions.

Photo: Triumph Motorcycles.