2018 Triumph Street Triple S Technical Analysis & Specification Breakdown
Engineered by Triumph for the naked motorcycle segment, the 2018 Triumph Street Triple S features a 765 cc (46.7 cu in) liquid-cooled in-line three, four-stroke configuration. In factory specification, peak output is rated at 111 HP (81 kW) at 11,250 rpm while maximum torque reaches 73 Nm (53.8 lb-ft) at 9,100 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 145.1 HP per liter and a 2,150 rpm working window between peak torque (9,100 rpm) and peak power (11,250 rpm), the engine character is placing it firmly in high-revving supersport territory where top-end breathing dominates.
On the scales, the Street Triple S measures 166 kg (366 lbs) dry, translating to a power-to-weight ratio of 0.67 HP/kg (1.5 kg per horsepower). Rider ergonomics and chassis geometry center around a 810 mm (31.9 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,410 mm (55.5 in) wheelbase engineered for quick, flickable steering geometry. The 17.4-liter (4.6 US gal) fuel tank paired with a rated consumption of 4.7 L/100 km provides an estimated theoretical range of roughly 370 km (230 miles) between fill-ups.
Within MotoLibrary's Triumph archive, this model family spans 4 indexed model years from 2017 to 2020, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
145.1 HP/L
Power-to-Weight
0.67 HP/kg (1.5 kg/HP)
Power Band Window
9,100–11,250 rpm
Theoretical Range
~370 km (230 mi)
Engine
Displacement765.0 ccm (46.68 cubic inches)
Engine TypeIn-line three, four-stroke
Power111.0 HP (81.0 kW)) @ 11250 RPM
Torque73.0 Nm (7.4 kgf-m or 53.8 ft.lbs) @ 9100 RPM
Compression12.7:1
Bore x Stroke78.0 x 53.4 mm (3.1 x 2.1 inches)
Valves/Cylinder4
Fuel SystemInjection. Multipoint sequential electronic fuel injection with SAI
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchWet. multi-plate
DrivelineX ring chain
Performance
Fuel Consumption4.70 litres/100 km (21.3 km/l or 50.05 mpg)
Greenhouse Gases109.0 CO2 g/km. (CO2 - Carbon dioxide emission)
Emission DetailsEuro 4
ExhaustStainless steel 3 into 1 exhaust system low single sided stainless steel silencer
Chassis
Frame TypeAluminium beam twin spar. Rear 2 piece high pressure die cast.
Rake24.8°
Trail104 mm (4.1 inches)
Front SuspensionShowa 41mm upside down separate function forks (SFF)
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Torque
Torque is useful for judging real-world pull, especially for touring, commuting and loaded riding.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
