Triumph Speed Four
|Engine||599 cc (36.6 cu in), liquid-cooled DOHC inline-4|
|Top speed||135 mph (217 km/h)|
|Power||73 kW (98 hp) @ 11,750 rpm|
|Torque||56 N⋅m (41 lb⋅ft) @ 8000 rpm|
|Transmission||6 speed, chain drive|
|Suspension||Front: 43 mm cartridge forks with dual rate springs and adjustable preload, compression and rebound damping|
Rear: Monoshock with adjustable preload, rebound and compression damping
|Brakes||Front: Twin 310 mm floating discs, 4 piston calipers|
Rear: Single 220mm disc, single piston caliper
|Tyres||Front: 120/70 ZR 17|
Rear: 180/55 ZR 17
|Rake, trail||24°, 89.1 mm (3.51 in)|
|Wheelbase||1,394 mm (54.9 in)|
|Dimensions||L: 2,060 mm (81 in)|
W: 665 mm (26.2 in)
H: 1,150 mm (45 in)
|Seat height||810 mm (32 in)|
|Weight||204 kg (449 lb) (wet)|
|Fuel capacity||18 l (4.0 imp gal; 4.8 US gal)|
|Fuel consumption||5.7 L/100 km; 49 mpg‑imp (41 mpg‑US)|
The Speed Four has similar twin round headlghts to the Speed Triple, but a different frame and engine. The Speed Four has the clip-on handlebars of the TT600, rather than the motocross-inspired handlebars of the Speed Triple and other streetfighters.
The Speed Four is mechanically similar to its predecessor, the TT600, with the exceptions of the cam profiles, ignition and fuel injection mapping, front spring rate, and other minor concessions to its streetfighter style; the frame and fully adjustable suspension are race-ready.
The engine is a 599 cc inline-four-cylinder engine, as used in the TT600. The bike has a top speed of 135 mph (217 km/h) and a 0–60 mph (0–97 km/h) time of 4.5 seconds. Motorcyclist tested the 2002 Speed Four's 0 to 1⁄4 mile (0.00 to 0.40 km) time at 11.65 seconds @ 114.9 mph (184.9 km/h) and 0 to 60 miles per hour (0 to 97 km/h) time at 3.71 seconds.
Triumph UK After Sales has confirmed that 4,606 Speed Fours were produced from 2002 through 2006. Of those 1,011 were produced for the US market with a further 54 for Canada.
This motorcycle has been compared to the following:
- Visordown: Triumph Speed Four Specification
- "Triumph speed four: undressed for success. (Road Test)", Motorcyclist, pp. 57+  , – , via , General OneFile (subscription required), December 2002
- "RiDER Power: The world's best handling motorcycles aren't sportsbikes". Motorcycle News. Retrieved 2008-11-24.
- Road Test: Middleweight Test, Visordown
- Ash, Kevin (23 March 2002). "A Triumph of class". The Telegraph.
- Mondo Middleweight: 2004 Triumph Speed Four 600 Motorcycle, MotorCyclist Online, retrieved 2015-04-28
- TRIUMPH SPEED FOUR (2002-2006) Review, Motorcycle News, retrieved 2015-04-30
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