A closer look at Triumphs Street Triple
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Triumph Motorcycles firmly stamped their mark all over the Supersport segment of the motorcycle market when they launched the highly acclaimed Daytona 675 back in March 2006. Since then, this ground breaking machine has scooped numerous magazine awards and has dominated both the Masterbike and Supertest multi-magazine tests, two years running.
An awesome machine, the Daytona 675 is a powerful illustration of Triumph’s commitment to a strong model development programme and demonstrates Triumph’s ability to deliver distinctive design and engineering excellence. With the world leader in the most hotly contested segment of the motorcycle market under their belt – what next?
Introducing the brand new Triumph Street Triple… Through a potent combination of performance DNA extracted from the Daytona 675 and aggressive streetfighter styling drawn from the Speed Triple, Triumph have created the most desirable naked middleweight motorcycle in the market. The younger brother of the Speed Triple, the Street Triple is a rebel with plenty of cause – lean, light, agile and dripping with attitude.
Packing a powerful punch, 108PS to be exact, and 69Nm of effortless torque, the Street Triple is set to see off any naked middleweight competitor with ease, and quite a few of the heavyweights too. The proven 675 engine delivers strong low and midrange performance, from tickover to the redline, while the distinctive three cylinder feel, and unmistakable sound, offer an electrifying and emotive ride. Add to this a featherlight weight and effortless handling and you have a bike that’s accessible, desirable and great fun for both new and experienced riders alike.
Design and Development
From the start of the Daytona 675 project, the design team knew they would follow the supersport bike with a streetfighter version, so they ensured the bike would look just as good with its kit off. But the Street Triple is so much more than just a stripped down 675…
The Street Triple project started in earnest back in November 2005 when the Daytona 675 was close to completion. The objective was clear: to create a truly sexy naked sports bike, accessible to new riders reluctant to take on the bulk and weight of a 1,000cc bike, yet exciting enough to be rewarding for those with plenty of riding experience. The first prototype of the Street Triple was tested by Triumph’s development riders in Spain in December 2005. Ironically, while the World’s press enthused over the Daytona 675 at its launch in Sepang, Triumph’s test riders were already singing the praises of the streetfighter version.
The initial test was followed by a rigorous programme of development and testing to optimise the performance of the engine and chassis, with volume production scheduled to start in July 2007. Engine The Triumph Street Triple shares the same 675cc, water-cooled three-cylinder, 12-valve engine as the Daytona 675 but with a slightly different cam profile, giving more low-end torque and a lower rev limit of 12,650 revs. The engine offers a broad spread of power, with strong bottom-end torque, backed by a heavy mid-range punch and topped with a searing burst of peak power, all with that characteristic three-cylinder roar.
The harmonic tone of the exhaust has been perfected by modifying the lengths and expansion ratios of the manifold and silencer to change the acoustic loading on the system. Concentrating on idle, hard accelerations and overrun to generate and tune the characteristic triple sound, the resulting howl is as distinctive and spine-tingling as ever. The close-ratio six-speed gearbox maximises the effectiveness of the engine’s impressive power and torque, meaning you’ve always got the perfect gear. Peak power of 108PS (106bhp), delivered at 11,700rpm, places the Street Triple at the top of the middleweight naked category and with 69Nm (51ft.lbf) of torque at 9,100rpm the bike is guaranteed to outperform all of its competitors.
But the best thing about the bike’s performance is that you don’t have to work hard to get it: the Street Triple produces more than 60Nm (44ft.lbf) of torque from 3,500rpm right through to 12,300rpm. Included valve angle is 23 degrees, leading to a nicely compact and efficient combustion chamber. Inlet valve diameter is 30.5mm, exhaust 25.5mm and single springs are used for both the inlet and exhaust valves for durability at higher rpm. The exhaust valves themselves feature a 4mm stem and are made from a Nimonic (nickel-based) material allowing them to run hotter. Combustion chambers and inlet port throats are fully CNC machined for greater accuracy and precise gas flow control. Nut-less con-rods reduce reciprocating weight, bore and stroke is 74.0 x 52.3mm and compression ratio is 12.65 to 1.
The 675 engine has been refined without detracting from the triple’s innate character and while the Street Triple can perform like a racing thoroughbred, Triumph’s typical toughness is engineered into every part. The 675 engine is designed to be pushed hard, over and over again. The engine is very much a part of the styling of the bike and the aesthetics have been carefully considered. The combined oil and water pump are neatly packaged within the engine to remove unsightly pipe work, which gives the added bonus of saving weight.
The Street Triple’s sophisticated Keihin closed-loop fuel-injection system uses three 44mm diameter throttle bodies, with three multi-spray injectors mounted in the throttle bodies. The bike carries sensors for throttle position, crank position, gear selected, road speed, air pressure, air and coolant temperature, plus a tilt sensor to stop the engine if the bike is dropped. Fresh air is drawn through a duct in the front subframe below the headlights and passes directly through the headstock to the airbox. The engine control unit (ECU) also controls engine idle speed and the operation of the secondary air injection system which reduces the hydrocarbon emissions from the exhaust. The engine is fully compliant with the forthcoming Euro-3 emission regulations.
The Street Triple’s aluminium frame comes directly from the Daytona and is fabricated from open-back and closed-back castings, designed specifically to take advantage of the benefits of the narrow three-cylinder engine design. Optimisation using extensive FEA (Finite Element Analyses) ensures there is maximum strength where needed and weight saving where possible, offering great advantages in performance and overall weight. Rake is set at 24.3º, with 95.3mm (3.75in) trail.
The wheelbase is 1,395mm (54.9in), whilst dry weight is 167kg (368lbs). The short, compact engine means that an aluminium swingarm measuring 574mm (22.6in) from rear wheel spindle to pivot point, as used on the Daytona 675, can be used on the Street Triple. This greatly improves suspension and wheel control, giving responsive, precise handling. The swingarm is a two-piece casting with an adjustable pivot position.
The Nissin two pot sliding calipers with sintered pads (the same material as used on the Daytona 675) give braking power that is top of its class. Lightweight five-spoked wheels come straight from the Daytona 675, measuring 17 x 3.5in (front) and 17 x 5.5in (rear). Dunlop Sportmax Qualifier tyres are fitted as standard (120/70 ZR17 front and 180/55 ZR17 rear), and approved options are the Pirelli SuperCorsa Pro and the Bridgestone BT014 G.
The low dual seat and new footrests and handlebars provide a comfortable riding position for rider and pillion without jeopardising the aggressive streetfighter styling of the bike. The Street Triple has the same headlights as its elder brother, the Speed Triple, and a comprehensive instrument console that shares the same functionality as that on the Daytona 675 but restyled to fit neatly within the lines of the Street Triple. The Triumph Street Triple is available in Jet Black, Fusion White and Roulette Green.
As with all Triumph bikes, the Street Triple Accessory range was designed and developed alongside the motorcycle itself and offers a range of options for tuning performance, enhancing the practicality of the bike or creating a dramatic new style. Accessories include a neat, aerodynamic fly screen for wind deflection, an easy-to-fit colour-matched seat cowl for a sleek tail end finish and a sharp belly pan, which protects the engine whilst complementing the naked style.
Following on from the success of the accessory exhaust system for the Speed Triple, Triumph has again collaborated with Arrow Special Parts to develop a 3-into-1 ‘Low Boy’ exhaust system for the Street Triple. Offered for Closed Circuit Competition use only, the system is manufactured from stainless steel with a carbon fibre end cap and provides performance gains throughout the torque curve coupled with a weight saving of 8kg compared to the standard silencers. The weight that remains is positioned further down, lowering the overall centre of gravity of the bike and further enhancing the handling of the impressive 675 chassis.
Rear bodywork finishers are also offered to provide a clean finish for the underside of the rear end when fitted with the ‘Low Boy’ style silencer. A pair of EC homologated Arrow slip-on silencers will follow in early 2008.
Continuing the performance theme, a number of high spec carbon fibre parts are available for the Street Triple, including tank pad, upper and lower chain guard and front mudguard. On the practical side, two styles of magnetic tank bag are available. These bags can be securely fitted or removed in seconds and feature Scotchlite reflective panels for improved visibility, clear map pockets, integrated waterproof rain covers and large zips pull tabs for easy use when wearing gloves.
Other essentials include a gel seat for additional comfort, which features double stitch detail and a premium finish, rear hugger for protecting the underside of the bike, a grab rail for the pillion passenger and a smoked flyscreen visor for added wind protection while giving the Street Triple a more aggressive appearance.
The Street Triple has masses of attitude and makes the most sensible rider grin like an idiot. The class leading performance and superb agility are matched with a competitive retail price, making the Street Triple a welcome addition to the Triumph streetfighter family, and a new entry point to Triumph’s range of triples.
Triumph Street Triple Specification:
Type Liquid-cooled, DOHC, in-line 3-cylinder
Bore/Stroke 74.0 x 52.3mm
Compression Ratio 12.65:1
Fuel System Multipoint sequential electronic fuel injection with forced air
induction and SAI
Exhaust Full stainless steel 3 into 1 into 2 exhaust system with twin
high level silencers.
Ignition Digital–inductive type via electronic engine management
Primary Drive Gear
Final Drive O ring chain
Clutch Wet, multi-plate
Gearbox 6-speed, close ratio
Gear Ratios Primary: 85/46
Oil Capacity 3.0 litres (0.8 US gals)
Frame Aluminium beam twin spar
Swingarm Braced, twin-sided, aluminium alloy
Wheels Front Cast aluminium alloy 5-spoke 17 x 3.5in
Rear Cast aluminium alloy 5-spoke 17 x 5.5in
Tyres Front 120/70 ZR 17
Approved tyres :
Dunlop Sportmax Qualifier TL OE
Bridgestone BT014 G
Pirelli Dragon Supercorsa Pro
Rear 180/55 ZR 17
Approved tyres as above
Suspension Front Kayaba, 41mm upside down forks. 120 mm travel
Rear Kayaba, Monoshock. 126 mm rear wheel travel
Brakes Front Twin 308mm floating discs. Nissin 2 piston sliding calipers
Rear Single 220mm disc. Nissin single piston caliper
Front brake master
Nissin integrated reservoir master cylinder
LCD speedo + tacho dial, trip comp, odo and clock, laptimer with 99 lap memory and gear position indicator.
Tachometer – Analogue type.
Dial face warning lights – LED’s MIL(Amber) Alarm(Red)
Dial face LCD – Speedometer, KPH, MPH
Odometer, Trip 1, Trip 2 Miles, KM.
Warning Light Bar – LED’s Turn Indicator(Green),
Neutral(Green), Main Beam (Blue), Low Fuel(Amber).
LCD – Coolant Temp (Bar graph), Gear selected, Clock, Trip
Trip computer – Average Speed, Maximum speed, Journey
Journey Time, Average Fuel Consumption, Instantaneous
Lap Timer – 99 lap memory, Average speed, Maximum
speed, Distance traveled (Per lap or total).
Gear Change Lights – Programmable set limit and display
(3 LED, 7 LED, LED Scale and off).
Control – 3 Button, Scroll, Set and Trip
Width (Handlebars) 736mm
Seat Height 800mm
Wheelbase 1395mm (54.9in)
Weight (Dry) 167kg
Fuel Tank Capacity 17.4 litres (4.6 gal US)
PERFORMANCE: (MEASURED AT CRANKSHAFT TO DIN 70020)
Maximum Power 108PS (107bhp) at 11700rpm
Maximum Torque 69Nm (51ft.lbf) at 9100rpm