2008 Triumph Rocket III Classic Technical Analysis & Specification Breakdown
At the heart of the 2008 Triumph Rocket III Classic classic motorcycle, Triumph relies on a 2294 cc (140 cu in) liquid-cooled in-line three, four-stroke powerplant. In factory specification, peak output is rated at 140 HP (102.2 kW) at 6,000 rpm while maximum torque reaches 147 Nm (108.4 lb-ft) at 2,500 rpm, transferring power to the rear wheel through a 5-speed gearbox and shaft drive (cardan) final drive. With a specific output of 61 HP per liter and a 3,500 rpm working window between peak torque (2,500 rpm) and peak power (6,000 rpm), the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the Rocket III Classic measures 319.3 kg (704 lbs) dry, translating to a power-to-weight ratio of 0.44 HP/kg (2.28 kg per horsepower). Rider ergonomics and chassis geometry center around a 736 mm (29 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,694 mm (66.7 in) wheelbase engineered for planted straight-line stability. The 23.84-liter (6.3 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Triumph archive, this model family spans 4 indexed model years from 2006 to 2009, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
61 HP/L
Power-to-Weight
0.44 HP/kg (2.28 kg/HP)
Power Band Window
2,500–6,000 rpm
Standover Height
736 mm (29 in)
Engine
Displacement2294.0 ccm (139.98 cubic inches)
Engine TypeIn-line three, four-stroke
Engine DetailsIn-line three, four-stroke
Power140.0 HP (102.2 kW)) @ 6000 RPM
Torque147.0 Nm (15.0 kgf-m or 108.4 ft.lbs) @ 2500 RPM
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.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
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.
