Triumph Trident 660 — OEM Fluid, Tire Pressure & Maintenance Specs
660cc Liquid-Cooled Inline-3 DOHC 12-Valve 120° Crank (Slip & Assist Wet Clutch) · Source: Triumph Trident 660 Official Owner’s Handbook Maintenance & Technical Data
According to the Triumph Trident 660 Official Owner’s Handbook Maintenance & Technical Data, the 2021–Present Triumph Trident 660 (chassis SMTL10/L101) requires 2.6 L (2.75 US qt) of SAE 10W-40 (JASO MA2, API SH or higher Semi/Full Synthetic) engine oil for a drain-only change and 2.8 L (2.96 US qt) with filter service (T1218001 / HF204). Standard solo cold tire pressure is 235 kPa / 2.35 bar / 34 PSI front (120/70 R17 M/C 58W) and 290 kPa / 2.90 bar / 42 PSI rear (180/55 R17 M/C 73W), paired with 3× NGK CR9EK spark plug(s) and a YTZ10S / YTX9-BS battery.
Drain only: 2.6 L (2.75 US qt)
R 290 kPa (2.90 bar)
Est. Range: ~298 km (185 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Wet Multi-Plate Manual Clutch NEVER use JASO MB |
|---|---|
| Recommended Viscosity & Grade | SAE 10W-40 (Alt: SAE 10W-50 (여름철 고회전 주행 허용)) · JASO MA2 · API SH or higher Semi/Full Synthetic |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 2.6 L (2.75 US qt) • With filter/strainer: 2.8 L (2.96 US qt) • Complete dry overhaul: 3.2 L (3.38 US qt) |
| OEM Oil Filter Code & Type | T1218001 / HF204 |
| Correct Oil Level Check Method | Upright on level ground; screw dipstick ALL THE WAY IN, then remove to read level |
| Oil Drain Bolt Torque | 25 N·m (18.4 lb-ft / 2.55 kgf·m) — Use fresh crush washer |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 120/70 R17 M/C 58W · Rear: 180/55 R17 M/C 73W (Tubeless) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 235 kPa / 2.35 bar / 34 PSI Rear: 290 kPa / 2.90 bar / 42 PSI |
| Cold Tire Pressure — 2-Up / Loaded Touring |
Front: 235 kPa / 2.35 bar / 34 PSI Rear: 290 kPa / 2.90 bar / 42 PSI |
| OEM Spark Plug & Quantity | NGK CR9EK × 3 (Gap: 0.6–0.7 mm) |
| OEM Battery Code & Rating | YTZ10S / YTX9-BS (12V 8.6Ah Sealed MF AGM) |
| Final Drive Maintenance | 520 X-Ring Sealed Chain (16T/51T, 118 links) — Maintain 28–38 mm slack |
| Brake Fluid & Coolant | DOT 4 · Triumph HD4X / D2053 Hybrid OAT Coolant (~2.25 L) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 660 cc · 81 hp @ 10,250 rpm · 64 N·m (47.2 lb-ft) @ 6,250 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 805 mm (31.7 in) · 189 kg (417 lbs) |
| Fuel Tank & Est. Real-World Range | 14 L (3.7 US gal) · ~21.3 km/L → ~298 km (185 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,000 km • Engine Oil / Filter: 16,000 km / 16,000 km • Air Filter / Spark Plug: 16,000 km / 32,000 km • Valve Clearance Check: 32,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Launched in 2021 as Triumph’s gateway 660 triple, the Trident 660 gained standard Shift Assist, Cruise Control, 6-axis IMU cornering ABS, and Showa SFF-BP internals for 2025 while retaining identical engine oil, filter, and spark plug specs.
Oil & Clutch Mechanical Engineering Note
Combining twin-like low-end grunt with a 10,250 rpm triple wail, the 660 engine takes 2.8 L with a T1218001 / HF204 spin-on filter. Crucial Triumph triple rule: there is no sight glass, and the right-side dipstick MUST be screwed all the way in with the bike held upright on level ground to read the true oil level!
Garage Wrenching Gotchas
- Never measure oil with the dipstick resting unthreaded! Triumph calibrates its 660/765 triple dipsticks to be threaded completely into the clutch cover while holding the bike upright 5 minutes after warm shutdown.
- Factory Michelin Road 5 tires run a 235 kPa (34 PSI) front and 290 kPa (42 PSI) rear cold pressure for both solo and two-up riding—saving 2 PSI off the front compared to 36 PSI liter bikes for agile turn-in.
5. Frequently Asked Questions (FAQ)
How much oil and what filter do I need for a Triumph Trident 660 oil change?
Grab three 1-liter bottles of SAE 10W-40 or 10W-50 JASO MA2 synthetic oil (2.8 L refill), one T1218001 / Hiflofiltro HF204 spin-on filter, and a fresh M14 sump washer torqued to 25 N·m.
How many spark plugs does the Triumph Trident 660 take?
As an inline-triple, it uses three dual-ground-electrode NGK CR9EK spark plugs, conveniently replaced alongside the 32,000 km (20,000 mi) valve clearance check.
How easy is it to flat-foot the 805 mm Triumph Trident 660?
Because the inline-three crankcase and front seat junction are remarkably narrow between the thighs, the 805 mm saddle feels closer to a 785–790 mm bike at stoplights.