Triumph Bonneville 400 Spied: Classic Retro Specs | Carside
Triumph Bonneville 400 Spotted Testing: Peashooter Exhaust, Wire-Spoke Wheels & 398cc TR Power
The retro modern-classic motorcycle domain is on the verge of a momentous arrival. Development test mules of the highly anticipated Triumph Bonneville 400 have once again been spotted testing on Indian roads ahead of an expected October festive debut. While the Speed 400 captured riders looking for a nimble, neo-retro roadster, the Bonneville 400 is an authentic heritage homage designed to challenge traditional heavyweights like the Royal Enfield Classic 350 and Honda CB350.
Authentic Bonneville Heritage Proportions & Chrome Detailing
The spied test motorcycle shows substantial visual and ergonomic departures from the Speed 400. In place of the compact, aggressive stance is a longer, more substantial roadster silhouette. A muscular 16-litre teardrop fuel tank with classic rubber knee pads flows into rounded vintage side covers. The exhaust system adopts the signature horizontal peashooter chrome pipe design that has defined the Bonneville family for more than six decades.
- Classic Peashooter Exhaust: Full-length straight chrome peashooter silencer delivering a deep, rhythmic exhaust thrum.
- Wire-Spoke Wheels: 18-inch front and 17-inch rear cross-spoke wheels fitted with vintage-tread roadster tires.
- Comfort Touring Ergonomics: Taller, swept-back handlebars paired with forward-set footpegs and a thick, ribbed bench saddle.
- Chrome Engine Casings: Polished finned cylinder heads and triangular engine badges reflecting timeless British craftsmanship.
Retuned 398cc TR-Series Engine: Relaxed Low-End Pull
Beneath the retro attire is the sophisticated 398cc liquid-cooled single-cylinder, four-valve DOHC TR-Series engine. While the Speed 400 revs aggressively to its 40 PS peak, internal engineering reports suggest the Bonneville 400 features a revised camshaft profile and heavier flywheel weighting. This tunes output to roughly 35 bhp while boosting low-RPM torque to 38 Nm at just 4,000 rpm, delivering effortless top-gear roll-on acceleration on open highways.
A 6-speed gearbox with an assist-and-slipper clutch ensures light lever action in congested city traffic. Braking is anchored by a 320mm front disc and 230mm rear disc, modulated by switchable dual-channel ABS and switchable traction control.
Triumph Bonneville 400 vs Key Retro Competitors
| Specification Benchmark | Triumph Bonneville 400 (Projected) | Royal Enfield Classic 350 | Honda CB350 H’ness |
|---|---|---|---|
| Engine Architecture | 398cc Liquid-Cooled DOHC Single | 349cc Air/Oil-Cooled SOHC Single | 348cc Air-Cooled SOHC Single |
| Power Output | ~35 bhp @ 7,500 rpm | 20.2 bhp @ 6,100 rpm | 20.8 bhp @ 5,500 rpm |
| Peak Torque | ~38 Nm @ 4,000 rpm | 27 Nm @ 4,000 rpm | 30 Nm @ 3,000 rpm |
| Gearbox & Clutch | 6-Speed with Slipper Clutch | 5-Speed Standard Clutch | 5-Speed with Assist/Slipper |
| Exhaust Architecture | Full Chrome Peashooter Silencer | Long Bottle Exhaust | Classic Chrome Pipe |
| Kerb Weight | ~182 kg | 195 kg | 181 kg |
| Expected Ex-Showroom Price | Rs 2.50 Lakh – Rs 2.70 Lakh | Rs 1.93 Lakh – Rs 2.25 Lakh | Rs 2.10 Lakh – Rs 2.16 Lakh |
The Carside Verdict
The Triumph Bonneville 400 is shaping up to be the most authentic, desirable mid-capacity classic motorcycle on Indian roads. By blending the immortal styling of the Bonneville line with modern liquid-cooled 398cc performance and a sub-Rs 2.70 lakh price tag, it is primed to capture the hearts of touring purists.
Frequently Asked Questions
What is the Triumph Bonneville 400?
The Bonneville 400 is an upcoming classic modern-retro motorcycle positioned alongside the Speed 400 and Scrambler 400 X, designed with authentic heritage Bonneville styling to compete with the Royal Enfield Classic 350.
What styling features set the Bonneville 400 apart from the Speed 400?
Spy photos reveal a larger teardrop fuel tank, traditional peashooter chrome exhaust, rounded side panels, upright handlebar ergonomics, a flat ribbed bench seat, and wire-spoke wheels.
What engine powers the Bonneville 400?
It is powered by Triumph’s 398cc liquid-cooled single-cylinder TR-Series engine, retuned to deliver roughly 35 bhp and a thicker low-end torque curve of 38 Nm.
What is the expected price and launch date for the Bonneville 400?
The Triumph Bonneville 400 is slated for an official festive launch in October 2026, with an expected ex-showroom price between Rs 2.50 lakh and Rs 2.70 lakh.
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