14 August. Friday 2026
Triumph Rocket III Roadster - 2018 Specifications and Reviews
The 2018 Triumph Rocket III Roadster is a heavyweight cruiser engineered for riders seeking raw power and commanding presence. Its massive 2.3-liter three-cylinder engine delivers commanding performance with a low-slung, accessible 750mm seat height that accommodates various rider sizes. Best known for its distinctive triple-cylinder character and imposing stance, this motorcycle excels for cruiser enthusiasts prioritizing straightline acceleration and classic American-style riding dynamics.
General information | |
| Category | Custom / cruiser |
| Year | 2018 |
| Model | Triumph Rocket III Roadster |
Engine and Transmission Specifications | |
| Exhaust system | Stainless steel 3 into 1 into 2. large volume catalysts in front of chrome-plated exhaust |
| Greenhouse gases | 188.2 CO2 g/km. (CO2 - Carbon dioxide emission) |
| Fuel consumption | 8.11 litres/100 km (12.3 km/l or 29.00 mpg) |
| Clutch | Wet. multi-plate |
| Transmission type,final drive | Shaft drive (cardan) |
| Gearbox | 5-speed |
| Cooling system | Liquid |
| Fuel control | Double Overhead Cams/Twin Cam (DOHC) |
| Fuel system | Injection. Multipoint sequential electronic fuel injection with twin butterflies and progressive linkage on primary butterflies |
| Bore x Stroke | 101.6 x 101.6 mm (4.0 x 4.0 inches) |
| Compression | 8.7:1 |
| Torque | 221.00 Nm (22.5 kgf-m or 163.0 ft.lbs) @ 2750 RPM |
| Power | 148.00 HP (108.0 kW) @ 5750 RPM |
| Engine details | Counter rotating crankshaft |
| Engine type | In-line three, four-stroke |
| | |
Brakes, suspension, Frame and wheels | |
| Wheels | Cast aluminum alloy 5 spoke |
| Rear brakes diameter | 316 mm (12.4 inches) |
| Rear brakes | Single disc. Nissin 4-piston fixed calipers. ABS system. |
| Front brakes diameter | 320 mm (12.6 inches) |
| Front brakes | Double disc. Nissin 4-piston fixed calipers. ABS system. |
| Rear tyre | 240/50-R16 |
| Front tyre | 150/80-R17 |
| Rear wheel travel | 105 mm (4.1 inches) |
| Rear Suspension | Kayaba black spring twin shocks with 5 position adjustable preload. |
| Front wheel travel | 120 mm (4.7 inches) |
| Front Suspension | Kayaba 43 mm upside down forks |
| Trail | 148 mm (5.8 inches) |
| Rake (fork angle) | 32.0° |
| Frame type | Tubular steel, twin spine. Twin-sided, steel swing arm. |
Physical measures and capacities | |
| Oil capacity | 5.90 litres (0.39 quarts) |
| Fuel capacity | 24.00 litres (6.34 gallons) |
| Wheelbase | 1,695 mm (66.7 inches) |
| Overall width | 970 mm (38.2 inches) |
| Overall length | 2,500 mm (98.4 inches) |
| Overall height | 1,165 mm (45.9 inches) |
| Seat height | 750 mm (29.5 inches) If adjustable, lowest setting. |
| Power/weight ratio | 0.4431 HP/kg |
| Dry weight | 334.0 kg (736.3 pounds) |
Other specs | |
| Maintenance | Find parts, fluids, filters, maintenance tools and service items on eBay |
| Factory warranty | 2 year unlimited mileage |
| Instruments | Analogue speedometer featuring LCD odometer, trip information, clock and analogue tachometer featuring fuel level indicator, gear position indicator |
| Starter | Electric |
| Color options | Matt Phantom Black, Phantom Black |
Performance Profile & Rider Fit
148 hp
Peak Power
3.4s
0-60 mph
Best For
Track25%
City45%
Cornering45%
Daily Riding65%
Touring65%
Passenger70%
Rider Profile
| Best For | This is a machine best suited to experienced riders who are confident managing enormous low-end torque and substantial weight at low speeds. |
| Purpose | Built as a muscular power-cruiser, it delivers brutal straight-line acceleration and effortless overtaking rather than nimble cornering ability. |
| Rider Fit | At 334 kg dry with a low seat height, it is manageable once rolling but demands strength and confidence during slow maneuvers, parking, and U-turns. |
| Character | The Rocket III Roadster has a dominant, torque-drenched personality that rewards relaxed, throttle-driven riding over aggressive lean-angle attacks. |
| Not Ideal For | This is not the right bike for new riders, tight urban commuting, or anyone seeking a light, flickable machine for twisty backroads. |
Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.
Rider Reviews
Total comments: 1
MotorcycleDB Review
The 2018 Triumph Rocket III Roadster is an impressive and powerful motorcycle that offers a thrilling riding experience. With its massive 2.3-liter engine, this bike delivers immense power and torque, making it one of the fastest and most exhilarating motorcycles on the market. Its sleek and stylish design, comfortable seating, and advanced technology features make it a standout choice for riders looking for a high-performance bike that also offers comfort and convenience. The Triumph Rocket III Roadster 2018 is a top-of-the-line motorcycle that delivers exceptional performance and style. Its impressive power and torque make it a force to be reckoned with on the road, while its advanced technology features and comfortable seating ensure a smooth and enjoyable ride. Whether you're a seasoned rider or a newcomer to the world of motorcycles, the Rocket III Roadster is sure to impress with its impressive capabilities and stunning design.Add a Comment
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