At the heart of the 2024 Triumph Speed 400 sport motorcycle, Triumph features a 398.2 cc (24.3 cu in) liquid-cooled single cylinder, four-stroke configuration. In factory specification, peak output is rated at 39.5 HP (28.8 kW) at 8,000 rpm while maximum torque reaches 37.6 Nm (27.7 lb-ft) at 6,500 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 99.2 HP per liter and a 1,500 rpm working window between peak torque (6,500 rpm) and peak power (8,000 rpm), the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.
On the scales, the Speed 400 measures 170 kg (375 lbs) wet (curb), translating to a power-to-weight ratio of 0.23 HP/kg (4.3 kg per horsepower). Rider ergonomics and chassis geometry center around a 790 mm (31.1 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,377 mm (54.2 in) wheelbase engineered for quick, flickable steering geometry. The 13-liter (3.4 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Triumph archive, this model family spans 2 indexed model years from 2024 to 2026, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
99.2 HP/L
Power-to-Weight
0.23 HP/kg (4.3 kg/HP)
Power Band Window
6,500–8,000 rpm
Standover Height
790 mm (31.1 in)
Engine
Displacement398.2 ccm (24.30 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power39.5 HP (28.8 kW)) @ 8000 RPM
Torque37.6 Nm (3.8 kgf-m or 27.7 ft.lbs) @ 6500 RPM
Compression12.0:1
Bore x Stroke89.0 x 64.0 mm (3.5 x 2.5 inches)
Fuel SystemInjection. Bosch electronic fuel injection with electronic throttle control
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchWet, multi-plate, slip
DrivelineX-ring chain
Performance
ExhaustStainless twin-skin header system with stainless steel silencer
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Torque
Torque is useful for judging real-world pull, especially for touring, commuting and loaded riding.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
