Triumph's Moto2-Bred 798 Engine Sets Up a Bigger, Meaner Street Triple for 2027

Triumph didn’t so much unveil its 2027 lineup this week as publish a release calendar. On October 6, the Hinckley company put out a teaser film and a schedule for four new models arriving between now and mid-December. Only one, the Bonneville T40, showed up with a full spec sheet. The rest came with dates, adjectives and enough shadowy imagery to keep forum sleuths busy until Thanksgiving.

The one that matters most to anyone who has ridden a Street Triple hard is the Street Triple 798, due November 17.

Same recipe, more displacement

Triumph says the 798 will use the new 798cc engine developed for the 2027 Moto2 championship. It also promises a spec “even more performance-focused than previous models.” That’s carefully vague, but the engine claim has real engineering behind it, because Triumph and MotoGP already detailed the race motor in August.

The race engine’s changes are all about breathing. It gets a new cylinder head with a redesigned low-inertia valvetrain, higher-flow ports and a reshaped combustion chamber that raises compression. Triumph also redesigned the crankcases and every internal part to handle the extra load, and the complete engine still came out 2 kg lighter. The claimed gain in peak power for the race unit is around 6%.

For context, Triumph rates the current Street Triple 765 R at 118 hp and the RS at 128 hp. Going from 765cc to 798cc is roughly a 4% increase in displacement. If you apply the race engine’s 6% to the RS, you land in the mid-130s. Treat that as arithmetic, not a leak. Road engines have to meet emissions and noise rules that a Moto2 motor never faces, and Triumph hasn’t published a number.

The more interesting detail is what happened to the race chassis. The new Moto2 engine moves the air intake and the engine mounting points, so chassis builders need completely new frames for 2027. If the road engine shares that architecture, the 798 is unlikely to be a re-bored 765 in a familiar frame.

What it means if you own, or want, a 765

Parts may not carry over. If the mounts and intake moved, aftermarket frame sliders, exhaust headers and engine protection made for the 765 may not fit the 798. Check the parts catalogs before you assume your current upgrades will transfer.

Ask about service costs. Triumph lists a 6,000-mile service interval for the current 765. A new valvetrain raises a fair question about whether valve-check intervals change. Triumph hasn’t said yet, so ask your dealer before signing.

Get insurance quotes early. More displacement and more power usually mean a new rating profile. Get a quote on the 798 once it’s in insurers’ systems rather than assuming it will cost the same as a 765.

Watch for deals on the outgoing bike. In the US, the 765 R starts at $10,595 and the RS at $13,545. Leftover inventory of a model that has just been replaced tends to become negotiable, and the 765 is still a very quick motorcycle.

Two Tigers and a small Bonneville

The Tiger 1200 arrives first, on October 27. Triumph promises a distinctive new look, an updated 1200cc triple with more performance and refinement, and what it calls the most sophisticated suspension it has ever fitted to a motorcycle. The Tiger 900 follows on December 15 with more power, an upgraded chassis and connectivity as standard. The Tiger 1200 and the Street Triple 798 will both be on display at EICMA and Motorcycle Live.

The Bonneville T40 is the only bike with numbers. It uses a 400cc TR Series single making 32 PS at 7,000 rpm and 36 Nm at 5,000 rpm. It weighs 191 kg ready to ride, and its 790 mm seat can drop to 770 mm with an accessory seat. Standard equipment includes cornering ABS, cornering traction control, cruise control and a 4-inch circular TFT with an analog-style Heritage Mode.

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It is also A2-compliant out of the box, which opens it to newer riders in Europe’s graduated licensing system. Triumph developed it alongside partner Bajaj. One detail current owners may notice: the T40’s 10,000-mile service interval is longer than the one on Triumph’s flagship middleweight naked. Pricing comes in early 2027, with bikes in dealerships that spring.

The real test

Making the Street Triple faster is the easy part. Triumph has been supplying every engine on the Moto2 grid since 2019, so it has plenty of race data to work from.

The harder question is whether the 798 keeps what made the 765 so good to live with: a usable midrange, reasonable running costs and a price that undercuts the European competition. More compression and higher-flow ports sound great on a racetrack, but on the street, owners care about how the bike pulls in traffic. We’ll find out on November 17. If you own a 765, is a bigger, hotter engine enough to trade up, or are you waiting for a leftover RS deal?

Images Via: Triumph

Eve Nowell

Administrator

Eve Nowell writes about cars for Backfire News, and she comes by it honestly—she grew up in a racing family, around engines and pit lanes before she was old enough to drive. That world isn't a beat she picked up; it's just where she's always been. At Backfire News she covers off-roading, classic car culture, motorsports, and the people behind the machines. She writes with the enthusiasm of someone who genuinely loves this stuff, but she's a stickler for getting the details right—the kind of writing that holds up with actual gearheads. She's still early in her career and building her own voice, bringing a fresh take to a world she's known her whole life. Her work runs across racing coverage, truck and off-road culture, collector vehicles, and the wider lifestyle that comes with all of it. When she's not writing, she's usually trackside, out in the garage, or chasing down the next story worth telling.

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