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2021 Triumph Trident 660 Overview
For 2021, Triumph offers the Trident 660 as a sport motorcycle with 660 cc on tap. The 2021 Triumph Trident 660 is built around a Four stroke, transverse three cylinder, DOHC, 4 valves per cylinder engine, a compression ratio of 11.1:1. Out on the road, the Trident 660 delivers 80 hp @ 10250 rpm of peak power and 64 Nm @ 6250 rpm of torque. In everyday use, the 2021 Trident 660 tips the scales at 189 kg, carries a 14-litre fuel tank, offers a seat height of 805 mm and spans a 1401 mm wheelbase. That's roughly 13.7 kg lighter than the average sport motorcycle in our database. Every technical detail, from suspension travel to tyre sizes, is covered in the full 2021 Triumph Trident 660 spec sheet below.
2021 Trident 660 - Pros & Cons
Strengths
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⚡
Strong power output: Peak output on the Trident 660 is 80 hp @ 10250 rpm and 64 Nm @ 6250 rpm of torque - strong numbers for what it is.
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🔧
Fuel injection: No choke, no jetting, no altitude compensation to think about - fuel injection just works across a wider range of conditions than carburetion.
Considerations
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⚙️
Chain final drive upkeep: A chain drivetrain is the most common setup in its class, but it's also the one that demands the most regular hands-on maintenance.
Wear Points & Servicing Notes
Cooling system servicing
With Liquid cooled, thermal management is largely automatic, but the coolant has a service life of its own - replace it on the manufacturer's interval to protect the water passages and thermostat.
Fuelling & injector care
Fuelling on the Trident 660 comes from Multipoint sequential electronic fuel injection with electronic throttle control. Cold starts and throttle response stay consistent across altitude and temperature, the main practical edge over a carbureted equivalent.
Brake disc and pad wear
2x 310mm discs Nissin 2-piston calipers up front provides the primary stopping power; inspect disc thickness and pad wear at each tyre change to catch scoring before it becomes a rotor replacement.
Suspension condition on used examples
Suspension duties are handled by 41mm Showa upside down separate function forks up front and Showa monoshock RSU, with preload adjustment at the rear. Weeping fork seals aren't a dealbreaker on a used bike, but they're a fair basis for negotiating price.
Final drive maintenance
Chain final drive on the Trident 660 means routine lubing and tension checks are part of ownership - skip them and sprocket wear accelerates noticeably.
Frame & chassis check
The Tubular steel perimeter frame, twin-sided, fabricated steel Swingarm chassis holds up well with normal use; on a used bike it's still worth checking the head-stock and swingarm pivot area for impact damage or corrosion.
Trident 660 - Buying & Maintenance Guide
What to check before buying
A pre-purchase check on the 2021 Triumph Trident 660 should cover the same ground every time: service history, chain and sprocket condition, and any oil seepage around the casings. Start it from cold if you can - a well-kept Trident 660 settles to a smooth idle within seconds.
Oil and filter changes
Oil changes are the cheapest insurance you can buy for a Trident 660's engine - keep to the manufacturer's interval rather than stretching it. Use the viscosity grade the manual specifies, not whatever's on sale.
Fuel system care
Injector systems like the Trident 660's hold up well with basic care - decent fuel, an occasional cleaner additive, and draining old fuel before any layup longer than three months.
2021 Triumph Trident 660 - Frequently Asked Questions
What engine does the 2021 Triumph Trident 660 have?
The 2021 Triumph Trident 660 uses a Four stroke, transverse three cylinder, DOHC, 4 valves per cylinder engine with 660 cc of displacement. It is liquid cooled.
How much does the 2021 Triumph Trident 660 weigh?
The 2021 Triumph Trident 660 weighs 189 kg. This is the manufacturer's wet figure.
How much power does the 2021 Triumph Trident 660 make?
The 2021 Triumph Trident 660 produces 80 hp @ 10250 rpm of power and 64 Nm @ 6250 rpm of torque. These are peak figures.
What is the fuel tank capacity of the 2021 Triumph Trident 660?
The 2021 Triumph Trident 660 has a 14-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 233-280 km between stops.
Is the 2021 Triumph Trident 660 suitable for shorter riders?
The 2021 Triumph Trident 660 has a seat height of 805 mm. This is a moderate seat height that suits a wide range of rider heights.
What brakes does the 2021 Triumph Trident 660 have?
The 2021 Triumph Trident 660 uses 2x 310mm discs Nissin 2-piston calipers at the front and Single 255mm disc Nissin single-piston sliding caliper at the rear.
What tyre sizes does the 2021 Triumph Trident 660 use?
The 2021 Triumph Trident 660 runs 120/70 - R17 front and 180/55 - R17 rear tyres. A good selection of sport, touring and all-weather rubber is available in these sizes.
What gearbox does the 2021 Triumph Trident 660 have?
The 2021 Triumph Trident 660 is fitted with a 6 Speed transmission.
Triumph Trident 660 Spec Evolution
The Triumph Trident 660 was produced across 2 model years (2021-2025). The table below highlights the key specifications that changed across the production run - useful whether you are comparing years or tracking down a specific variant.
| Specification |
2021 |
2025 |
| Max Power |
80 hp / 60 kW @ 10250 rpm |
81 hp / 59.6 kW @ 10250 rpm |
| Wet Weight |
189 kg / 417 lbs |
195 kg / 430 lbs |
| Engine Detail |
Four stroke, transverse three cylinder, DOHC, 4 valves per cylinder |
Four stroke, transverse three cylinder, DOHC, 4 valves per cylinder |
| Seat Height |
805 mm / 31.7 in |
810 mm / 31.9 in |
| Brakes - Front |
2x 310mm discs Nissin 2-piston calipers |
2 x 310mm discs, 2-piston sliding calipers OCABS |
| Wheelbase |
1401 mm / 55.2 in |
1402 mm / 55.2 in |
| Brakes - Rear |
Single 255mm disc Nissin single-piston sliding caliper |
Single 255mm disc Nissin single-piston sliding caliper OCABS |
| Suspension - Rear |
Showa monoshock RSU, with preload adjustment |
Showa monoshock RSU, with preload adjustment |
Key Specifications
Engine
Four stroke, transverse three cylinder, DOHC, 4 valves per cylinder
Power
80 hp / 60 kW @ 10250 rpm
Torque
64 Nm / 47 lb-ft @ 6250 rpm
Top Speed
Not published by manufacturer
Fuel Capacity
14 Litres / 3.7 US gal
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Full 2021 Triumph Trident 660 Specifications
Year
2021
Make Model
Triumph Trident 660
Seat Height
805 mm / 31.7 in
Wheelbase
1401 mm / 55.2 in
Height
1089 mm / 42.9 in (excl Mirrors)
Length
2020 mm / 79.5 in
Width
795 mm / 31.3 in (incl Handlebars)
Fuel Capacity
14 Litres / 3.7 US gal
Wet Weight
189 kg / 417 lbs
Displacement
660 cc / 40.2 cu-in
Engine Detail
Four stroke, transverse three cylinder, DOHC, 4 valves per cylinder
Bore x Stroke
74.0 x 51.1mm
Compression Ratio
11.1:1
Cooling System
Liquid cooled
Emissions
Euro-5
Exhaust
Stainless steel 3 into 1 header system with low single sided stainless steel silencer
Fuel Induction
Multipoint sequential electronic fuel injection with electronic throttle control
Starter
Electric
Clutch
Wet, multi-plate, slip and assist
Final Drive
X-ring chain
Transmission / Drive
6 Speed
Frame Type
Tubular steel perimeter frame, twin-sided, fabricated steel Swingarm
Suspension - Front
41mm Showa upside down separate function forks (SFF)
Suspension - Rear
Showa monoshock RSU, with preload adjustment
Rake
24.6°
Trail
107.3 mm / 4.2 in
Wheel Travel - Front
120 mm / 4.7 in
Wheel Travel - Rear
134 mm / 5.3 in
Instrumentation
Multi-function instruments with colour TFT screen
Brakes - Front
2x 310mm discs Nissin 2-piston calipers
Brakes - Rear
Single 255mm disc Nissin single-piston sliding caliper
ABS
Standard
Rims - Front
3.5 x 17
Rims - Rear
5.5 x 17
Tyres - Front
120/70 - R17
Tyres - Rear
180/55 - R17
Wheels
5 Spoke cast aluminum
Specifications are compiled from manufacturer documentation and cross-referenced
technical sources, and corrected on an ongoing basis.
Spot an error? Let us know.
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