Triumph Rocket III Roadster - 2015 Specifications and Reviews

The 2015 Triumph Rocket III Roadster is a heavyweight cruiser powered by a massive 2,294cc three-cylinder engine, designed for riders seeking commanding presence and effortless torque. Its cruiser-focused geometry, shaft drive, and relaxed ergonomics suit long-distance touring and casual riding over aggressive performance. Best known for its enormous displacement and distinctive triple-cylinder character, it delivers accessible power with classic British-American styling.

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General information

CategoryCustom / cruiser
Year2015
ModelTriumph Rocket III Roadster
 
 

Engine and Transmission Specifications

Exhaust systemStainless steel 3 into 1 into 2. large volume catalysts in front of chrome-plated exhaust
Greenhouse gases188.2 CO2 g/km. (CO2 - Carbon dioxide emission)
Fuel consumption8.11 litres/100 km (12.3 km/l or 29.00 mpg)
ClutchWet. multi-plate
Transmission type,final driveShaft drive (cardan)
Gearbox5-speed
Cooling systemLiquid
IgnitionDigital-inductive type via engine management system
Fuel controlDouble Overhead Cams/Twin Cam (DOHC)
Fuel systemInjection. Multipoint sequential electronic fuel injection with twin butterflies and progressive linkage on primary butterflies
Bore x Stroke101.6 x 101.6 mm (4.0 x 4.0 inches)
Compression8.7:1
Torque221.00 Nm (22.5 kgf-m or 163.0 ft.lbs) @ 2750 RPM
Power148.00 HP (108.0 kW) @ 5750 RPM
Engine detailsCounter rotating crankshaft
Engine typeIn-line three, four-stroke

Brakes, suspension, Frame and wheels

WheelsCast aluminum alloy 5 spoke
Rear brakes diameter316 mm (12.4 inches)
Rear brakesSingle disc. Nissin 4-piston fixed calipers, Nissin ABS system.
Front brakes diameter320 mm (12.6 inches)
Front brakesDouble disc. Nissin 4-piston fixed calipers, Nissin ABS system.
Rear tyre240/50-R16
Front tyre150/80-R17
Rear SuspensionKayaba black spring twin shocks with 5 position adjustable preload. 105mm wheel travel
Front SuspensionKYB 43mm upside down forks. 120mm travel
Trail148 mm (5.8 inches)
Rake (fork angle)32.0°
Frame typeTubular steel, twin spine.
 
 

Physical measures and capacities

Oil capacity5.90 litres (0.39 quarts)
Fuel capacity24.00 litres (6.34 gallons)
Wheelbase1,695 mm (66.7 inches)
Overall width970 mm (38.2 inches)
Overall length2,500 mm (98.4 inches)
Overall height1,165 mm (45.9 inches)
Seat height750 mm (29.5 inches) If adjustable, lowest setting.
Power/weight ratio0.4431 HP/kg
Weight incl. oil, gas, etc367.0 kg (809.1 pounds)
Dry weight334.0 kg (736.3 pounds)

Other specs

MaintenanceFind parts, fluids, filters, maintenance tools and service items on eBay
Factory warranty2 year warranty unlimited mileage
StarterElectric
Color optionsMatt Phantom Black/white, Phantom Black/red

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 ForThis is a machine best suited to experienced riders who are confident managing enormous low-end torque and substantial weight at low speeds.
PurposeBuilt as a muscular power-cruiser, it delivers brutal straight-line acceleration and effortless overtaking rather than nimble cornering ability.
Rider FitAt 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.
CharacterThe Rocket III Roadster has a dominant, torque-drenched personality that rewards relaxed, throttle-driven riding over aggressive lean-angle attacks.
Not Ideal ForThis 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 Fit Visualizer

2015 Triumph Rocket III Roadster Rider Ergonomics Assessment

Calculated in your browser only - your height/inseam are never sent to our servers.

Feet:

At 750mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with both feet flat on the 2015 Triumph Rocket III Roadster, with a cramped knee angle of around 85 degrees and an upright riding position.

Data quality: measured. Assumes about 30mm of suspension sag once seated (a typical street-bike rule of thumb - stiffer or softer suspension will vary). This is an approximation from category-typical geometry and generic body proportions, not a measurement of this specific bike or you - sit on it before you buy.

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