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Cruisers

2018Triumph Rocket III Roadster

★ 5.0

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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

⇄ Compare with another bike All model years

Other years 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019

How it rides

Editorial estimate from the spec sheet - not lab tested

Off-road & trail5%

Cornering45%

City riding45%

Daily riding65%

Touring65%

Two-up70%

Track25%

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?

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Your height

Inseam (optional)

Units

At 750mm, a rider of 68.9" with a 31" (estimated) inseam will reach the ground with both feet flat on the 2018 Triumph Rocket III Roadster, with a cramped knee angle of around 85 degrees and an upright riding position.

Assumes about 30mm of suspension sag once seated. This is an approximation from category-typical geometry, not a measurement of this bike or of you - sit on one before you buy.

More bikes at 750 mm or under — Short Kings →

Find bikes that fit your height →

Full specifications

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
Oil capacity: 5.90 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

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

5.0

★★★★★

Rider rating

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.