| MODEL | TRIUMPH SPEED FOUR 2004 - 2006 |
| Year | 2004 - 2006 |
| Engine Type | Four-stroke, transverse four-cylinder, DOHC, 4 valves per cylinder |
| Displacement / Capacity | 599 cc / 36.6 cu in |
| Bore X Stroke | 68 x 41.3 mm |
| Compression Ratio | 12.5:1 |
| Cooling System | Liquid cooled |
| Max Power | 71.4 kW / 98 hp @ 11750 rpm |
| Max Torque | 55 Nm / 5.6 kgf-m / 41 lb-ft @ 8000 rpm |
| Ignition | Digital inductive via electronic engine management |
| Induction | Multipoint sequential electronic fuel injection with forced air induction |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6 Speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | 43 mm forks with dual rate springs and adjustable preload, compression and rebound damping |
| Rear Suspension | Monoshock with adjustable preload, compression and rebound damping |
| Front Brakes | 2 x 320 mm discs, 4 piston calipers |
| Rear Brakes | Single 220 mm disc, 1 piston caliper |
| DIMENSION SPECS | |
| Overall Length | 2165 mm / 85.2 in |
| Overall Width | 690 mm / 27.2 in |
| Overall Height | 1110 mm / 43.7 in |
| Seat Height | 810 mm / 31.9 in |
| Wheelbase | 1395 mm / 54.9 in |
| Ground Clearance | — |
| Dry Weight | 170 kg / 375 lbs |
| Wet Weight | 202 kg / 446 lbs |
| WHEEL SPECS | |
| Front Tyre | 120/70 ZR17 |
| Rear Tyre | 180/55 ZR17 |
| FUEL SYSTEM | |
| Fuel Capacity | 18 Litres / 4.8 US gal / 4.0 Imp gal |
| Fuel Consumption | 4.8 L/100 km / 49 US mpg / 59 Imp mpg |
| Top Speed | 231.4 km/h / 144 mph |
The later Speed Four years carried on the same naked 600 cc four-cylinder formula as the first bikes, with no documented mechanical changes in the sources found. It remained a lightweight, high-revving streetfighter based on the TT600, with firm suspension, sharp brakes and a cramped, sporty riding position. Production ended in 2006.
