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Upcoming Triumph Bonneville 400 spotted on test!

  • Likely to come in two engine variants
  • Continues with the retro-inspired styling
  • Launch likely by end of 2026

Triumph Motorcycles has been spotted testing what could be a key addition to its entry-level modern-retro lineup, the Bonneville 400. While the brand has already established a strong presence with its 400cc range, the Bonneville badge has so far been missing from this segment, something that now looks set to change.

The test mule clearly carries signature Bonneville styling. A teardrop-shaped fuel tank, chunky fenders, and a peashooter-style exhaust all echo the design language of larger models like the Triumph Bonneville T100. Attention to detail is evident too, with neatly integrated bullet indicators, classic headlamp brackets, and clean mounting points that reinforce its authentic, old-school appeal.

Triumph Bonneville 350

A new single-pod instrument cluster and a small circular taillight further enhance the retro theme. The bike also appears to feature a revised subframe, likely designed to accommodate a flatter seat with white piping. This could also suggest a longer swingarm, potentially improving both stance and stability.

Unlike the more modern hardware seen on its 400cc siblings, the Bonneville leans into tradition. It uses telescopic front forks, twin rear shock absorbers, and spoke wheels, staying true to the classic formula. Even the disc brake design appears to draw inspiration from larger Bonnevilles, maintaining visual consistency across the range.

Triumph Bonneville 350

Under the skin, two engine options are expected. One is likely to be a new 350cc single-cylinder, liquid-cooled unit that is designed to fit under the tax threshold in India, while for other markets, it is likely to be the existing 398cc engine producing 39.5bhp and 37.5Nm, as seen in models like the Triumph Speed 400.

If priced competitively, the Bonneville 350/400 could pose a serious challenge to segment leaders like the Royal Enfield Classic 350.

Image Source- MotoBob

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