Leaked Specs: Triumph’s New 350cc Lineup Performance Details Emerge Ahead of April 6 Launch

HINCKLEY, UK – Ahead of the highly anticipated official launch on April 6, a leaked document has pulled back the curtain on Triumph Motorcycles’ strategic shift toward a smaller displacement engine for its entry-level global lineup. The British marquee is set to transition from its current 400cc platform to a new 350cc engine, a move largely driven by tax efficiency and broader market accessibility.

The leak provides a comprehensive look at the power, torque, and performance metrics for the upcoming Speed 350 (or Speed 400), Scrambler X/XC, Thruxton 400/350, and the Speed T4.

Engineering Shift: Bore Reduction for Better Value

Triumph has reportedly achieved the displacement drop from 398cc to 349cc by reducing the engine’s bore size. While the displacement is smaller, the manufacturer aims to retain the premium “400” branding in some markets while leveraging the lower GST brackets in others.

On average, the new lineup sees a power dip of 2–5 PS and a torque reduction of 5–6 Nm. While on-paper performance shows a slight decline, industry experts suggest the real-world impact in urban environments will be negligible.

Model-by-Model Performance Comparison

1. The Cafe Racer: Thruxton 400

The Thruxton remains the powerhouse of the entry-level family, though it sees a slight softening of its aggressive edge.

• New Power: 40 PS @ 8,750 RPM | Torque: 32 Nm @ 7,500 RPM
• Performance: 0-100 kmph in 8.3 seconds.
• Top Speed: 157 kmph (Down from 161 kmph).

2. The Roadster: Speed 400 (350cc)

Triumph’s popular roadster maintains its agile character despite the downsized heart.

• New Power: 37 PS @ 8,500 RPM | Torque: 32 Nm @ 7,000 RPM
• Performance: 0-100 kmph in 8.1 seconds.
• Top Speed: 147 kmph (A marginal 1 kmph drop).

3. The Adventurers: Scrambler 400 X & XC

Both Scrambler variants share the same tuning, prioritizing a balance between highway stability and low-end grunt.

• New Power: 37 PS @ 8,500 RPM | Torque: 32 Nm @ 7,000 RPM
• Performance: 0-100 kmph in 8.8 seconds.
• Top Speed: 144 kmph (Down from 146.5 kmph).

4. The Entry Point: Speed T4

The most accessible model in the range sees the most significant change in its acceleration profile.

• New Power: 29 PS @ 7,500 RPM | Torque: 31 Nm @ 5,500 RPM
• Performance: 0-100 kmph in 9.6 seconds.
• Top Speed: 137 kmph (Down from 141 kmph).

The Bottom Line

While enthusiasts might focus on the slight reduction in top-end speed (3–5 kmph lower across the board) and a 0.5 to 1-second slower sprint to 100 kmph, the 350cc platform is designed for efficiency. By optimizing the engine for the 350cc segment, Triumph is positioned to offer more competitive pricing without sacrificing the signature “Triumph feel” in daily commuting and mid-range highway cruising.

All eyes now turn to the April 6 launch event, where final pricing and regional availability will be confirmed.