Cruisers
2018Triumph Rocket III Roadster
49 fields on record
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.
- Capacity
- 2294.0 ccm
- Engine
- In-line three-cylinder, four-stroke
- Gearbox
- 5-speed
- Dry weight
- 334.0 kg
- Seat height
- 750 mm
- Power
- 148.0 HP (108.0 kW) @ 5750 RPM
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Built as a muscular power-cruiser, it delivers brutal straight-line acceleration and effortless overtaking rather than nimble cornering ability.
- Built for
- 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.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Will it fit you?
Worked out in your browser - nothing is sent to usRange and running costs
Worked out in your browser - nothing is sent to usBased on the maker's published fuel consumption and tank size. Official figures come from a gentle lab test - most riders use 10-30% more fuel than this, so expect less range in real riding, and the last litres of a tank are reserve. Prices shown greyed are examples - type your own.
Reliability & safety
Bike Reliability score, safety recalls and owner complaintsUS owner complaints
None filed for 2018 · 2 across all yearsNo US owner complaints are on record for the 2018 model; owners of other years of the Triumph Rocket III Roadster have filed 2.
Source: NHTSA owner complaints (United States). These are unverified reports from owners, not confirmed defects — a handful is normal for a popular model.
Bike Reliability
How the score works →83
out of 100Excellent
The Triumph Rocket III Roadster passed its annual roadworthiness test first time 89.3% of the time, 7.1 points above expected for bikes of the same age and mileage. That beats 83% of models.
This covers every year of the model.
Test records don't say which version a bike is, so this covers Triumph Rocket III Roadster / Triumph Rocket III Touring together.
89.3%Passed first time
5.0%Failed outright
5.7%Fixed during test
10,000Typical miles
1,730Tests
Pass rate by miles ridden
All years of this model.
Against its rivals · ranks 5 of 6
| # | Model (all years) | Score | Tests |
|---|---|---|---|
| 1 | Indian Chief | 95 Excellent | 826 |
| 2 | Indian Chief Dark Horse | 93 Excellent | 282 |
| 3 | Indian Scout | 88 Excellent | 3,937 |
| 4 | Harley-Davidson Fat Boy | 83 Excellent | 6,083 |
| 5 | Triumph Rocket III Roadster | 83 Excellent | 1,730 |
| 6 | Harley-Davidson Softail Slim | 76 Good | 2,367 |
Rivals are the most-viewed bikes on MotorcycleDB in the same category and engine size, from within three years of this model.
From British annual roadworthiness tests, 2005-2025. Contains public sector information licensed under the Open Government Licence v3.0 (DVSA MOT test data, Great Britain). How Bike Reliability works.
Engine
- Capacity
- 2294.0 ccm
- Power
- 148.0 HP (108.0 kW) @ 5750 RPM
- CO2 Emissions
- 188 CO2 g/km
- EPA Certificate No.
- JTDXC2.30VJM-002
- EPA Est. Fuel Consumption
- 8.01 L/100km (29.4 US mpg)
- EPA CO Emissions
- 4.5 CO g/km
- Torque
- 221.0 Nm (22.5 kgf-m) @ 2750 RPM
- Engine type
- In-line three-cylinder, four-stroke
- Fuel consumption
- 8.10 litres/100 km (12.3 km/l)
- Power/weight ratio
- 0.4431 HP/kg (dry)
- Bore x stroke
- 101.6 x 101.6 mm
- Compression
- 8.7:1
- Cooling system
- Liquid
- Fuel system
- Injection
- Starting
- Electric
- Ignition
- Digital-inductive type via engine management system
- Aspiration
- Naturally aspirated
- Valves per cylinder
- 4
Transmission
- Gearbox
- 5-speed
- Transmission type
- Manual
- Final drive
- Shaft
- Clutch
- Wet. multi-plate
Dimensions & weight
- Wheelbase
- 1695 mm
- Overall length
- 2500 mm
- Overall width
- 970 mm
- Overall height
- 1165 mm
- Seat height
- 750 mm
- Dry weight
- 334.0 kg
- Wet weight
- 367.0 kg
- Fuel capacity
- 24.00 litres
Chassis & suspension
- Frame
- Tubular steel, twin spine. Twin-sided, steel swing arm.
- Front suspension
- Kayaba 43 mm upside down forks
- Rear suspension
- Kayaba black spring twin shocks with 5 position adjustable preload.
- Front wheel travel
- 120 mm
- Rear wheel travel
- 105 mm
- Rake (fork angle)
- 32.0°
- Trail
- 148 mm
Brakes & wheels
- Front brakes
- Double disc. Nissin 4-piston fixed calipers. ABS system.
- Front brakes diameter
- 320 mm
- Rear brakes
- Single disc. Nissin 4-piston fixed calipers. ABS system.
- Rear brakes diameter
- 316 mm
- ABS
- Yes
- Front tyre
- 150/80-R17
- Rear tyre
- 240/50-R16
Maintenance
- Oil capacity
- 5.90 litres
Other
- Color options
- Matt Phantom Black, Phantom Black
- Warranty
- 24
- Fuel Tank Material
- Metal
Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.
What changed, year to year
Differences highlighted| Specification | 2010 | 2012 | 2015 | 2017 | 2018 | 2019 |
|---|---|---|---|---|---|---|
| Capacity | 2294 cc | 2294 cc | 2294 cc | 2294 cc | 2294 cc | 2294 cc |
| Dry weight | 320 kg | 327 kg | 334 kg | 334 kg | 334 kg | 334 kg |
| Seat height | 750 mm | 750 mm | 750 mm | 750 mm | 750 mm | 750 mm |
| Fuel capacity | 24 L | 24 L | 24 L | 24 L | 24 L | 24 L |
Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.
Rider Reviews
Common questions
What is the engine size of the Triumph Rocket III Roadster?
The 2018 Triumph Rocket III Roadster has a Capacity of 2294.0 ccm (139.99 cubic inches).
What engine power does the Triumph Rocket III Roadster have?
The 2018 Triumph Rocket III Roadster has a Power of 148.0 HP (108.0 kW) @ 5750 RPM.
How many gears does the Triumph Rocket III Roadster have?
The 2018 Triumph Rocket III Roadster has a Gearbox of 5-speed.
What is the torque of the Triumph Rocket III Roadster?
The 2018 Triumph Rocket III Roadster has a Torque of 221.0 Nm (22.5 kgf-m or 163.0 ft.lbs) @ 2750 RPM.
How much does the Triumph Rocket III Roadster weigh?
The 2018 Triumph Rocket III Roadster has a Dry weight of 334.0 kg (736.3 pounds).
Shop this bike
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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.
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