Triumph Bonneville 400 Spyshots Emerge: Royal Enfield, Honda CB350 Rival

Written By: Neeraj Padmakumar

Published: April 3, 2026

Updated: April 3, 2026

For years, the Royal Enfield Classic 350 has dominated its segment. People love this motorcycle for its iconic retro design and strong road presence. The outgoing model is based on the modern J-platform and is quite reliable as well. The Classic 350’s dominance could end soon. Triumph will soon introduce a challenger, a test mule of which has now been spotted for the first time.

Bonneville 400 Spied: Early Observations

Triumph already offers a neo-retro roadster in the mid-capacity segment—the Speed 400. However, the motorcycle spotted recently shows a clear deviation in visual identity and character. Instead of the Speed 400’s neo-retro approach, it leans heavily into traditional retro styling, which could pose a threat to the Classic 350’s success.

The Triumph motorcycle (let’s call it Bonneville 400 for now) features:

A teardrop-shaped fuel tank
Circular headlamp
Radiator grille that complements its design
Classic-looking front and rear fenders
Belly pan
Strong visual resemblance to the larger Bonneville T120
Wire-spoke wheels (likely paired with tube-type tyres)

An all-new circular instrument cluster distinguishes it from the Speed 400, which has a semi-digital unit. The Bonneville 400 seems to offer a relaxed, upright riding position.

Changes Beyond Styling

The spy shots reveal that changes on the Bonnie extend beyond styling. It will differ significantly from the Speed 400 in terms of hardware:

Front forks: Conventional RSY telescopic forks with gaiters for a more authentic retro look.
Rear suspension: Mono-shock setup on the Speed, but twin shock absorbers on the Bonneville 400, suggesting a focus on comfort.
Braking: Large disc brakes on both wheels with dual-channel ABS standard. Notably, the front disc is mounted on the right side of the wheel, and the rear one on the left.

Expected Specifications: Likely the New 350cc Engine

While it’s unclear if the Bonneville will use the existing 400cc single-cylinder unit or the downsized TR-series (350cc) engine, the latter is more likely. The entire Triumph 400 lineup is transitioning to the smaller engine, and the Bonneville 400 (350) would follow suit. This would make it eligible for a lower tax slab (18%) and position it directly against the Classic 350.