The Triumph Rocket III Roadster is well known for its status of having the largest displacement engine of a production motorcycle. With a whopping 2,294cc or 140 cubic inch, 3-cylinder engine.
Development of the Triumph Rocket III Roadster began in 1998. It was intended to be a competitor to Harley Davidson Ultraglide and the Honda Goldwing. So initially the target engine displacement was 1,600cc.
However, in 2002 Yamaha launched it's 1,670cc Road Star Warrior. And, at the same time Honda launched it's 1,795cc VTX1800. Triumph decided to raise the bar. Squeezing in a 2.3 litre engine.
Released in 2004, the bike never quite managed to win over the loyal Harley and Goldwing riders. But as Motor Cycle News said, "The Triumph Rocket III is an incredible experience and bravo to Triumph for making it." They also went on to say that "Compared to a Harley, the Rocket III is a steal. It’s better braked, faster, handles better and it’s British."
The sheer force and presence of the Triumph Rocket III continues to deliver a simply stunning riding experience. An unmatched experience on two wheels.
2004-2005 Triumph Rocket III Full Specifications
Get to know the 2004-2005 Triumph Rocket III in exquisite detail with our meticulously crafted motorcycle specifications tables.
Click or tap on a navigation pane below to find your way through our highly detailed, categorised 2004-2005 Triumph Rocket III specifications.
2004-2005 Triumph Rocket III Dimensions Specifications Table
Attribute
Value
Overall length
2,480 mm
Overall width
880 mm
Wheelbase
1,690 mm
Seat height
740 mm
Dry Weight
320 kg (without fuel and fluids)
Maximum payload
235 kg (rider, passenger, luggage and accessories)
2004-2005 Triumph Rocket III Frame Specifications Table
Attribute
Value
Frame type
Tubular steel
Rake / Caster angle
32 °
Trail length
152 mm
2004-2005 Triumph Rocket III Engine Specifications Table
Attribute
Value
Power
142 PS @ 5,750 rpm (DIN 70020)
Torque
200 Nm @ 2,500 rpm
Engine capacity / displacement
2,294 cc
Engine configuration
3 Cylinder, 12 Valve, DOHC
Arrangement
In-line, longitudinal
Bore and Stroke
101.6 mm x 94.3 mm
Compression ratio
8.7 : 1
2004-2005 Triumph Rocket III Cylinder Head Specifications Table
Attribute
Value
Intake valve seat angle
90 °
Intake valve seat width
1.000 mm - 1.100 mm
1.500 mm (service limit)
Exhaust valve seat angle
90 °
Exhaust valve seat width
1.000 mm - 1.100 mm
1.000 mm - 1.100 mm (service limit)
2004-2005 Triumph Rocket III Valves and Springs Specifications Table
Attribute
Value
Intake valve clearance
0.10 mm - 0.15 mm
Intake valve lift
8.30 mm
Intake valve stem diameter
5.475 mm - 5.490 mm
Intake valve guide diamater
5.485 mm - 5.500 mm (bore)
Intake valve seat angle
90 °
Intake valve head diameter
37.90 mm
Intake valve seat width
1.98 mm - 2.26 mm
Exhaust valve clearance
0.15 mm - 0.20 mm
Exhaust valve lift
8.30 mm
Exhaust valve stem diameter
5.476 mm -5.490 mm
Exhaust valve guide diameter
5.485 mm - 5.500 mm (bore)
Exhaust valve seat angle
90 °
Exhaust valve head diameter
32.30 mm
Exhaust valve seat width
1.98 mm - 2.26 mm
2004-2005 Triumph Rocket III Valve Train Specifications Table
Attribute
Value
Type
DOHC
Intake valve bucket diameter
28.015 mm - 28.035 mm (bore)
27.978 mm - 27.993 mm (outer)
Exhaust valve bucket diameter
28.015 mm - 28.035 mm (bore)
27.978 mm - 27.993 mm (outer)
2004-2005 Triumph Rocket III Camshaft and Timing Specifications Table
Attribute
Value
Intake valve cam timing
opens @ 12° BTDC @ 1.0 mm lift
closes @ 28° ABDC @ 1.0 mm lift
220 ° open duration
Exhaust valve cam timing
opens @ 41° BBDC @ 1.0 mm lift
closes @ 11° ATDC @ 1.0 mm lift
232 ° open duration
Camshaft journal diameter
22.93 mm - 22.96 mm (outer)
23.000 mm - 23.021 mm (bore)
Camshaft journal clearance
0.040 mm - 0.091 mm
0.13 mm (service limit)
Camshaft end float
0.10 mm - 0.13 mm
Camshaft run-out
0.015 mm
2004-2005 Triumph Rocket III Crankshaft Specifications Table
Attribute
Value
Crankshaft big end journal diameter
40.946 mm - 40.960 mm
40.922 mm (service limit)
Crankshaft big end bearing clearance
0.035 mm -0.065 mm
0.100 mm (service limit)
Crankshaft main bearing journal diameter
43.092 mm -43.108 mm
43.068 mm (service limit)
Crankshaft main bearing clearance
0.018 mm - 0.041 mm
0.10 mm (service limit)
Crankshaft end float
0.05 mm - 0.20 mm
0.40 mm (service limit)
Crankshaft run-out
0.04 mm
0.07 mm (service limit)
2004-2005 Triumph Rocket III Cylinder and Piston Specifications Table
Attribute
Value
Piston diameter
101.561 mm - 101.577 mm (outer)
101.511 mm (outer service limit)
Gudgeon pin bore diameter in piston
21.994 mm - 22.001 mm
22.022 mm (service limit)
Gudgeon pin diameter
21.982 mm - 21.987 mm (outer)
21.972 mm (outer service limit)
Top piston ring to groove clearance
0.002 mm - 0.006 mm
0.16 mm (service limit)
Second piston ring to groove clearance
0.02 mm - 0.06 mm
0.16 mm (service limit)
Top piston ring groove width
1.01 mm -1.03 mm
1.11 mm (service limit)
Second piston ring groove width
1.01 mm - 1.03 mm
1.11 mm (service limit)
Piston ring oil groove width
2.51 mm - 2.53
Top piston ring end gaps
0.20 mm - 0.35 mm
0.55 mm (service limit)
Second piston ring end gaps
0.30 mm - 0.50 mm
0.675 mm (service limit)
Piston ring oil end gaps
0.20 mm - 0.70 mm
0.875 mm (service limit)
Connecting rod small end diameter
22.005 mm - 22.018 mm (inner)
22.028 mm (inner service limit)
Connecting rod big end side clearance
0.15 mm 0.30 mm
0.50 mm (service limit)
2004-2005 Triumph Rocket III Clutch and Primary Drive Specifications Table
Attribute
Value
Primary Drive type
Gear, with backlash eliminator
Reduction ratio
1.034 : 1
Clutch type
Wet multi-plate
Clutch actuation method
Cable
Clutch lever free play
2 mm - 3 mm
Number of friction plates
10
Friction plate thickness
3.72 mm - 3.88 mm
3.5 mm (service limit)
2004-2005 Triumph Rocket III Transmission Specifications Table
Attribute
Value
Type
5-speed, constant mesh
Gear ratio
1st gear = 2.929 : 1
2nd gear = 1.947 : 1
3rd gear = 1.435 : 1
4th gear = 1.160 : 1
5th gear = 0.964 : 1
Gear selector fork / claw thickness
5.90 mm - 6.00 mm
Gear selector fork /claw thickness
5.80 mm (service limit)
Gear selector groove width
6.05 mm - 6.15 mm
6.30 mm (service limit)
Gear selector fork to groove clearance
0.50 mm (service limit)
2004-2005 Triumph Rocket III Final Drive Specifications Table
Attribute
Value
Final drive
Bevel geared crown wheel and pinion
Final drive ratio
2.846 : 1
2004-2005 Triumph Rocket III Lubrication Specifications Table
Attribute
Value
Oil capacity
5.9 litres (dry fill)
5.4 litres (wet fill, includes filter)
5.1 litres (wet fill, excludes filter)
Recommended oil approval rating
API SH (or higher) and JASO MA
Oil viscosity
10W / 40 or 15W / 50
Oil type
Semi or fully synthetic
Oil pump rotor tip clearance
0.15 mm
0.20 mm (service limit)
Oil pump body clearance
0.15 mm - 0.22 mm
0.20 mm (service limit)
Oil pump rotor end float
0.02 mm - 0.07 mm
0.10 mm (service limit)
2004-2005 Triumph Rocket III Cooling System Specifications Specifications Table
Attribute
Value
Coolant mixture
50% anti freeze in distilled water
Anti-freeze type
Mobil Antifreeze
Coolant system capacity
3.2 litres
Radiator cap opening pressure
17.4 psi
Thermostat begin to open temperature
85 ℃
Temperature gauge sensor resistance
187Ω @ 100 ℃
2004-2005 Triumph Rocket III Fuel System Specifications Table
Attribute
Value
Fuel type
Unleaded, 95 RON (US - 89 RON/MON)
Fuel tank capacity
25 litres
Low level warning lamp
5.5 litres remaining
Fuel pump type
Submerged, electric
Fuel pressure
43.5 psi (nominal)
Purge control system
Modulated, vacuum
2004-2005 Triumph Rocket III Fuel Injection System Specifications Table
2004-2005 Triumph Rocket III Ignition System Specifications Table
Attribute
Value
Type
Digital,inductive
Electronic rev limiter
6,500 rpm
Timing pick-up coil resistance
0.56 KΩ ℃
Timing pick up coil air gap
Fixed, not adjustable mm
Ignition coil type
Inductive, twin output
Spark plug type
NGK DPR8EA9, 2 per cylinder
Spark plug gap
0.9 mm
2004-2005 Triumph Rocket III Front Suspension and Steering Specifications Table
Attribute
Value
Front axel travel
120 mm
Recommended front fork oil grade
Kayaba 01 oil (SAE 0W)
Oil level
89 mm (fork fully compressed, sping removed)
Oil volume
667 ml (dry fill)
2004-2005 Triumph Rocket III Rear Suspension Specifications Table
Attribute
Value
Rear axel travel
105 mm
2004-2005 Triumph Rocket III Front Brake Specifications Table
Attribute
Value
Front brake type
Two four piston callipers acting on twin discs
Front disc diameter
320 mm
Front disc thickness
5.0 mm
4.0 mm (service limit)
Front disc run-out
0.3 mm (service limit)
Recommended front brake fluid
DOT 4
Front master cylinder diameter
14 mm (inner)
2004-2005 Triumph Rocket III Rear Brake Specifications Table
Attribute
Value
Rear disc diameter
316 mm
Rear disc thickness
7.5 mm
6.5 mm (service limit)
Rear disc run-out
0.15 mm (service limit)
Recommended rear brake fluid
DOT 4
Rear master cylinder diameter
12.7 mm (inner)
2004-2005 Triumph Rocket III Wheels and Tyres Specifications Table
Attribute
Value
Front wheel size
MT 3.5 x 17 inch
Front tyre size
150 / 80 R17
Front tyre pressure
34 psi (cold)
Front wheel rim axial run-out
0.5 mm (service limit)
Front wheel rim radial run-out
0.5 mm (service limit)
Rear wheel size
MT 7.5 x 16 inch
Rear tyre size
240 / 50 R16
Rear tyre pressure
42 psi (cold)
Rear wheel rim radial run-out
0.5 mm (service limit)
Rear wheel rim axial run-out
0.5 mm (service limit)
2004-2005 Triumph Rocket III Electrical Charging Specifications Table
Attribute
Value
Battery voltage rating
12 volts DC
Battery capacity
18 ampere hour (Ah)
Alternator current rating
37 amps
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