A new retro-styled Triumph 400 has been spotted testing in India, and it will join the Speed 400 and Scrambler 400 X as a more classic, Bonneville-inspired offering in Triumph’s small-capacity line-up.
1. Triumph Bonneville 400 could get a single-pod LCD or TFT dash
2. A different rear subframe allows for a dual-shock absorber setup
3. Likely to rival the Royal Enfield Classic 350
Triumph Bonneville 400 spotted: What to expect?
Likely to be launched in the second half of 2026
The test mule reveals a clear shift in hardware, most notably the move to a twin-shock rear suspension setup, which likely necessitates a new rear subframe to suit its old-school brief.
The engine casing and pea-shooter exhaust feature a brushed aluminium finish with added chrome elements, giving it a more period-correct look. However, this single-cylinder Bonneville has also been spotted testing internationally with a black powder-coated engine casing and exhaust. It seems that the bike also gets a centre stand from the factory – a first for a Triumph 400.
In terms of design, the bike sticks closely to classic roadster proportions with a flat, single-piece seat and a neatly integrated chrome grab rail. The rear section appears near-production ready, although the tail-light unit is not installed on this particular test mule. Up front, both the switchgear and instrument console are new, though it remains unclear whether the display is a TFT unit or a reverse-LCD setup.
The Bonneville 400 will use the downsized 349cc iteration of the erstwhile 398cc engine that was recently launched. This baby Bonneville will use the same tune as the Speed T4. For reference, the T4 now comes powered by a 349cc, single-cylinder, liquid-cooled engine that produces 29hp and 31Nm, paired with a six-speed gearbox.
Given its positioning and hardware, this upcoming Triumph is likely to be priced to rival the Royal Enfield Classic 350 and Bullet 350, expanding Triumph’s reach deeper into the retro commuter space, with launch expected in the second half of 2026, around the festive season.
Image credits: Powerdrift/Instagram
Dinshaw Magol
