Triumph Rocket III - 2008 Specifications and Reviews
The 2008 Triumph Rocket III is a heavyweight custom cruiser built for riders seeking raw power and distinctive character. Its massive 2.3-liter three-cylinder engine delivers 140 horsepower and 147 foot-pounds of torque, making it one of the most powerful cruisers available. Best known for its unique triple-cylinder engine configuration and commanding presence, it appeals to experienced riders who prioritize performance and individuality over convention.
General information | |
| Category | Custom / cruiser |
| Year | 2008 |
| Model | Triumph Rocket III |
| | |
Engine and Transmission Specifications | |
| Clutch | Wet. multi-plate |
| Transmission typefinal drive | Shaft drive (cardan) |
| Gearbox | 5-speed |
| Cooling system | Liquid |
| Ignition | Digital - inductive type - via electronic engine management system |
| Fuel control | DOHC |
| Fuel system | Injection. Multipoint sequential electronic fuel injection |
| Bore x stroke | 101.6 x 94.3 mm (4.0 x 3.7 inches) |
| Compression | 8.7:1 |
| Torque | 147.00 |
| Power | 140.00 |
| Stroke | 4 |
| Engine type | In-line three |
| Capacity: | 2294.00 ccm (139.98 cubic inches) |
Physical measures and capacities | |
| Wheelbase | 1,694 mm (66.7 inches) |
| Overall width | 970 mm (38.2 inches) |
| Overall length | 2,499 mm (98.4 inches) |
| Overall height | 1,166 mm (45.9 inches) |
| Seat height | 739 mm (29.1 inches) If adjustable, lowest setting. |
| Dry weight | 319.3 kg (704.0 pounds) |
Triumph Rocket III dimensions and frame | |
| Rear brakes diameter | 316 mm (12.4 inches) |
| Rear brakes | Single disc |
| Front brakes diameter | 320 mm (12.6 inches) |
| Front brakes | Double disc |
| Rear tyre dimensions | 240/50-R16 |
| Front tyre dimensions | 150/80-R17 |
| Rear suspension | Chromed spring twin shocks with adjustable preload |
| Front suspension | 43mm upside down forks |
| Rake (fork angle) | 32.0° |
| Frame type | Tubular steel. twin spine |
Speed and acceleration | |
| Power/weight ratio | 0.4384 HP/kg |
| | |
Other specs | |
| Maintenance | Find parts, fluids, filters, maintenance tools and service items on eBay |
| Color options | Claret. Phantom Black |
| Fuel capacity | 23.84 litres (6.30 gallons) |
Performance Profile & Rider Fit
Best For
Rider Profile
| Best For | Best suited to experienced riders who are comfortable managing a very heavy, torque-laden machine at low speeds. |
| Purpose | Built as a muscle cruiser that delivers massive straight-line thrust and effortless overtaking power rather than nimble cornering. |
| Rider Fit | Its 320kg dry weight and low seat height demand strength and confidence at parking-lot speeds, though the low center of gravity helps once rolling. |
| Character | A brawny, torque-dominant cruiser whose enormous inline-triple engine defines the riding experience with relentless low-end pull. |
| Not Ideal For | Not a good fit for riders seeking a lightweight, flickable bike for tight twisties or off-road adventures. |
Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.
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⚠ Safety Recalls (1)
ON CERTAIN MOTORCYCLES, WHEN THE ENGINE IS RETURNING TO IDLE IT MAY STALL.
Risk: IF THE MOTORCYCLE STALLS, THE RIDER WILL HAVE TO RESTART THE ENGINE INCREASING THE RISK OF A CRASH.
Remedy: DEALERS WILL INSPECT AND DOWNLOAD NEW ENGINE MANAGEMENT SOFTWARE FREE OF CHARGE. THE RECALL BEGAN ON OCTOBER 17, 2007. OWNERS MAY CONTACT TRIUMPH AT 678-854-2010.
Source: NHTSA. View all Triumph recalls →
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