Triumph Trident 660 (2021-2025) Maintenance Schedule
This is the maintenance schedule and service interval guide for the first-generation Triumph Trident 660, covering the 2021-2025 model years, including A2- and LAMS-approved versions.
The Trident 660 has a 660 cc inline three-cylinder engine with a compression ratio of 11.95:1. In unrestricted form, it makes 59.6 kW (81 PS / 80 hp) at 10,250 rpm and 64 Nm (47 lb-ft) at 6,250 rpm.
Restricted versions use the same basic engine and chassis, so they follow the same maintenance schedule. Triumph updated the Trident 660 for 2025 with more standard electronics, an upgraded fork, new finishes, and new colour schemes, but it kept the same engine tune and service intervals.
Model-year scope: This schedule covers 2021-2025 Trident 660 models. Triumph made substantial engine and chassis changes for 2026, creating a new generation. The maintenance schedule for the 2026+ Triumph Trident 660 will be published separately.
The Trident 660 shares its basic engine platform with Triumph’s entry-level sport-tourer, the Triumph Tiger Sport 660. You can also compare it with the Triumph Daytona 660, which uses a more powerful version of the 660 triple.
Updated August 2026 with the 2025 model changes, new images, clearer model-year scope, and a note about the separate 2026+ generation. Previously updated in May 2023 to correct the 16,000 km / 10,000 mile intervals and in January 2024 with chain-adjustment guidance.
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2025 Triumph Trident 660 updates
Triumph gave the Trident 660 a substantial equipment update for 2025 without changing the 660 cc engine’s 59.6 kW (81 PS / 80 hp) output, 64 Nm (47 lb-ft) torque peak, or its 16,000 km (10,000 mile) / 12-month service interval. This means the maintenance table on this page still applies to the 2025 model.
Electronics and rider aids
The 2025 Trident gained a six-axis inertial measurement unit (IMU), which supports cornering-sensitive ABS and traction control. Triumph also made its up-and-down Shift Assist quickshifter, single-button cruise control, MyTriumph Bluetooth connectivity, and self-cancelling indicators standard equipment.
A new Sport riding mode joined the existing Road and Rain modes. The colour TFT section in the round instrument cluster can show turn-by-turn navigation and control phone calls and music when paired with a phone.
Suspension, finishes, and colours
Triumph replaced the earlier separate-function fork with a 41 mm Showa SFF-BP big-piston fork. It is still non-adjustable and has 120 mm (4.7 in) of travel, while the rear Showa unit still offers preload adjustment and 130 mm (5.1 in) of travel.
The 2025 bike also received a forged aluminium top yoke and brake pedal. Its colour choices were Cosmic Yellow, Cobalt Blue, Diablo Red, and Jet Black, with new graphics on the first three.
Why the 2026+ Trident 660 is separate
For 2026, Triumph reworked the Trident 660 much more extensively. The revised engine makes 70 kW (95 PS / 94 hp) and 68 Nm (50 lb-ft), uses three 44 mm throttle bodies, and revs to 12,650 rpm. Triumph also revised the cylinder head, airbox, cooling system, six-speed gearbox, frame, rear suspension, handlebar, seat, headlight, fuel tank, and other bodywork.
Because those changes go beyond a normal model-year equipment update, this page stops at 2025. A separate 2026+ Trident 660 maintenance schedule will cover the new generation.
Triumph Trident 660 Service Intervals
Basic service intervals for the Triumph Trident 660 are to change the oil and filter every 10000 miles / 16000 km or year.
Change the air filter and spark plugs every 20000 miles / 32000 km, and check the valves and the camshaft timing at the same time.
The Trident 660 has hydraulic brakes and a cable-operated clutch. Keep the brake fluid fresh and inspect, lubricate, and adjust the clutch cable as required.
Finally, regularly clean, lubricate, and adjust the tension of the drive chain.
There’s more detail in the full maintenance schedule below.
What you need to service the Triumph Trident 660
Below is a list of general maintenance items you need to service your Trident 660.
| Part | Triumph Trident 660 |
|---|---|
| Engine oil | Semi or fully synthetic 10W-40 oil that’s API SH or JASO MA or higher, e.g. Castrol Power 1 Racing 4T 10W-40. |
| Oil filter | Triumph part T1218001 or Hiflofiltro part HF204RC (common to many Triumph motorcycles) |
| Spark plug | NGK CR9EK spark plug. |
| Air filter | DNA air filter P-TR6N21-01 is a well-respected aftermarket filter. |
| Coolant | Triumph D2053 OAT coolant (50-50 pre-mixed). You can substitute this with Motorex M3.0, another OAT coolant. (See here for more about alternatives to Triumph D2053) |
| Battery | A Yuasa YTX9-BS battery |
| Bulbs | All LED, you need Triumph parts (but they’re unlikely to fail!) |
| Brake fluid | Use DOT 4, e.g. Castrol DOT 4 |
| Grease | An NLGI 2 spec lithium soap-based grease, e.g. Royal Purple NLGI 2 grease |
| Chain | Maintain your chain with a high-quality lubricant like Motul chain lubricant or Motul chain paste |
Maintenance schedule for the Triumph Trident 660
Below is the maintenance schedule for the Triumph Trident 660.
The table has the same content as from the manual, though re-formatted slightly to make it easier to read.
Daily / Pre-ride checks
Do the following checks on the Triumph Trident 660 daily or before every ride. Also do them with every regular service.
| Trident 660 Daily / pre-ride checks |
|---|
| Oil cooler – check for leaks |
| Fuel system – check for leaks, chafing etc. |
| Coolant level – check/top up |
| Clutch – check operation |
| Clutch cable – check function and adjust as necessary |
| Wheels – inspect for damage |
| Tyre wear/tyre damage – check |
| Tyre pressures – check/adjust |
| Lights, instruments, and electrical systems – check |
| Steering – check for free operation |
| Front and rear suspension – check for leaks/smooth operation |
| Brake system – check operation |
| Brake pads – check wear levels |
| Brake master cylinders – check for fluid leaks |
| Brake calipers – check for fluid leaks and seized pistons |
| Brake fluid levels – check |
| Drive chain slack – check/adjust See below for notes |
| Fasteners – inspect visually for security |
| Bank angle indicators – inspect visually for wear |
| Side stand – check operation |
Trident 660 regular maintenance schedule
Below is the regular maintenance schedule to be done every 16,000 km (10,000 miles) or every year.
Notes
- Do the daily checks as well as the scheduled checks below.
- If there’s both a time and distance interval (e.g. for oil changes), follow the earlier of the two.
- Items marked [T] need specialist Triumph equipment
| mi x 1000 | 0.6 | 10 | 20 | 30 | 40 | |
|---|---|---|---|---|---|---|
| km x 1000 | 1 | 16 | 32 | 48 | 64 | Every |
| Engine oil – replace (Motul 7100 10W-40) | ✓ | ✓ | ✓ | ✓ | Year | |
| Engine oil filter – replace (HF204RC) | ✓ | ✓ | ✓ | ✓ | Year | |
| Exhaust butterfly valve cables – check cable for chafing, cracks or damage. Replace if necessary | ✓ | ✓ | ✓ | ✓ | Year | |
| Air filter – renew | ✓ | ✓ | More often if riding in wet or dusty conditions | |||
| Spark plugs – renew (NGK CR9EK) | ✓ | ✓ | ||||
| Cooling system – check hoses for chafing, cracks or damage. Replace if necessary | ✓ | ✓ | ✓ | ✓ | ||
| Coolant – renew (Motorex M3.0) | 3 years | |||||
| Clutch lever pivot – clean/grease | ✓ | ✓ | ✓ | ✓ | Year | |
| Valve clearances – check/ adjust | ✓ | ✓ | ||||
| Camshaft timing – check/ adjust | ✓ | ✓ | ||||
| Wheel bearings – check for wear/smooth operation | ✓ | ✓ | Year | |||
| Headstock bearings – check/adjust | ✓ | ✓ | ✓ | ✓ | ✓ | Year |
| Rear suspension unit and linkage – lubricate | ✓ | ✓ | ||||
| Fork oil – renew | ✓ | |||||
| Swinging arm spindle – lubricate | ✓ | ✓ | ||||
| Brake fluid – renew (Castrol DOT 4) | 2 years | |||||
| Drive chain – lubricate (Motul chain paste) | ✓ | ✓ | ✓ | ✓ | Year (See below) | |
| Drive chain – wear check | ✓ | ✓ | ✓ | ✓ | Year | |
| Drive chain rubbing strip – check for wear, cracks, or damage | ✓ | ✓ | ✓ | ✓ | Year | |
| [T] Instruments, chassis ECM, keyless ECM and engine ECM–check for latest calibration download using the Triumph diagnostic tool | ✓ | ✓ | ✓ | ✓ | Year | |
| [T] Autoscan – Carry out a full Autoscan using the Triumph diagnostic tool | ✓ | ✓ | ✓ | ✓ | Year | |
| [T] Carry out all outstanding Service Bulletin and warranty work | ✓ | ✓ | ✓ | ✓ | Year | |
| [T] Complete the service record book and reset the service indicator | ✓ | ✓ | ✓ | ✓ | Year |
Drive chain maintenance — Extra notes
Maintain your drive chain regularly — not just at major services.
In another section of the manual, Triumph recommends servicing the chain by the below schedule, and “also after riding in wet weather, on wet roads, or any time that the chain appears dry.”
| Item | Every |
|---|---|
| Drive chain – Check slack, adjust as necessary See below | Pre-ride |
| Drive chain – lubricate | 200 miles (300 km) |
| Drive chain – wear check | 500 miles (800 km) |
Checking chain slack
To check the slack on the Trident 660, put the motorcycle in neutral, onto its kickstand, and on a level surface. Make sure there is no luggage or load on the bike.
Check the slack on the lower part of the chain, midway between the sprockets, and check it in multiple places (move the motorcycle forwards and backwards) as chains wear unevenly.
Slack on the Triumph Trident 660 is defined as the free movement of the chain.
Target chain slack for the Triumph Trident 660: 43-55 mm (1.7-2.2 in)
If the chain slack is out of spec, you need to adjust it.
Adjusting chain slack
To adjust the chain slack on the Trident 660, follow the steps below. The goal is to set it to 43mm to allow slack to increase with chain wear.
- Loosen the rear axle nut with a breaker bar and the lock nuts on either side of the axle.
- Turn the adjuster nuts to tighten (or loosen) the chain. Keep checking the chain tension to see if it has come within spec to 43 mm.
- Keep an eye on the adjuster alignment on either side of the axle. Make sure that the adjustment is to the same point so the chain and wheel remain aligned.
- When you’re done, tighten the axle to 110 Nm (81 lb-ft).
- Re-check the chain slack again to make sure it’s still within spec.
- Tighten the adjuster nuts to 3 Nm (2 lb-ft).
- Tighten the adjuster lock nuts to 15 Nm (11 lb-ft).
Wheels, Tyres, and Tyre Pressures
The Triumph Trident 660 ships with Michelin Road 5 tyres, but you can fit most modern sportbike tyres onto it as it has very standard rim sizes.
| Wheel | Rim size | Tyre/Tire size | Tyre/Tire pressure (cold) |
|---|---|---|---|
| Front | 17 x 3.5 in | 120/70 ZR17 58W | 2.34 bar (34 psi) |
| Rear | 17 x 5.5 in | 180/55 ZR17 73W | 2.9 bar (42 psi) |
The above are recommended starting point tyre pressures. Adjust tyre pressures as best suit your conditions.
About the Triumph Trident 660
The Triumph Trident 660 is an entry-level naked roadster, Triumph’s entrant into the “middleweight sports” category, a rapidly expanding market for motorcycles. It’s also a bike available in A2 or LAMS-restricted form, which means it can be learner-legal in Europe and the Asia-Pacific.
It’s designed to appeal to a wide range of riders:
- Casual riders who don’t want the most intense sportbike possible, and don’t want to spend that much
- New riders on their learner licenses (A2/LAMS) who want the same bike, just conforming to legal requirements
- People with a sense of nostalgia about the triples of old…
Unlike the Triumph Speed Triple and Street Triple bikes, the Trident 660 is not a high-strung sportbike. It’s not a bike people would buy intending to race (other than for fun!), and so its components — while not cheap as chips — are lower end than the other bikes, and aren’t designed to be pushed too hard.
The 2021-2024 Trident 660 came with ride-by-wire throttle control, ABS, switchable traction control, Road and Rain riding modes, LED lighting, a TFT/LCD instrument display, and a slip-and-assist clutch. Triumph offered its Bluetooth connectivity module and Shift Assist quickshifter as accessories.
For 2025, Triumph added the equipment described above: cornering-sensitive ABS and traction control, Sport mode, standard Shift Assist, cruise control, Bluetooth connectivity, and self-cancelling indicators.
The Triumph Trident 660’s motor revs happily above 10000 rpm — though not much further. But the speed and grace with which it gets there means that it’s a bike you’ll really enjoy flinging about back country roads.
The torque curve is extremely flat, with most of its torque available on a wide plateau between 3000 and 9000 rpm. This makes it really easy to ride in a range of styles from everyday commuting to getting RPMS up in back roads.
The suspension and braking are capable too. It comes with Showa upside down forks, though they’re non-adjustable, and a Showa preload-adjustable monoshock with a remote reservoir.
The non-adjustable nature of the front suspension is just one thing that differentiates the Triumph Trident 660 from higher-end alternatives, like the Aprilia Tuono 660, which has fully adjustable suspension (and costs about 50% more).
But the Trident’s spec is still on the upper end compared to most middleweight road bikes.
Some competitors to the Triumph Trident 660 are other middleweight motorcycles like the Kawasaki Z650, Honda CB650R, the Yamaha MT-07, and the Ducati Monster 659, which are all available in learner-legal incarnations in some markets.
For the 2024 model year, Triumph released the Triumph Daytona 660, a higher-spec middleweight sport bike with the same fundamental engine, but tuned for a bit more top-end. There are also a few other components that Triumph improved for the Daytona, listed below.
| Model | Trident 660 / Tiger Sport 660 | Daytona 660 |
|---|---|---|
| First model year | 2021 (Tiger Sport 2022) | 2024 |
| Peak power | 60 kW / 81 PS / 80 bhp @ 10,250 rpm | 70 kW / 95 PS / 94 bhp @ 11,250 rpm |
| Peak torque | 64 Nm (47 lb-ft) @ 6,250 rpm | 69 Nm @ 8,250 rpm |
| Compression ratio | 11.95:1 | 12.05:1 |
| Front suspension | Showa 411mm SFF USD | Showwa 41mm SFF-BP USD |
| Front brakes | 2 x 310 mm discs, 2-piston sliding calipers | 2 x 310 mm discs, 4-piston radial calipers |
Manual for the Triumph Trident 660
The above maintenance schedule and service intervals come straight from the user manual for the Triumph Trident 660.
You can download the manual for the Trident 660 directly from Triumph’s website.
