This Triumph Bonneville T100 parts and maintenance guide covers every model year from 2017 to 2026: the liquid-cooled 900 cc high-torque twin that replaced the air-cooled bike in 2017, including the T100 Black and special editions. Every figure below comes from Triumph’s own owner’s handbook, and most routine service parts (oil, filter, plugs, battery) are the same in every year covered.
Photo above: Triumph Bonneville T100 Black in Athens on 10-24-2023 by George E. Koronaios, CC BY-SA 4.0, via Wikimedia Commons.
Quick picks: everything for a T100 oil change
An oil and filter change takes 3.4 L (3.6 US qt) of 10W-40 or 10W-50 (fully or semi-synthetic, API SN (or higher) and JASO MA2). Without a filter change it takes 3.2 L (3.4 US qt). A 4-liter jug covers a full service.
- Engine oil: 10W-40 or 10W-50 motorcycle oil (JASO MA2)
- Oil filter: HiFlo HF204 or K&N KN-204-1
- Drain plug crush washer: replace it at every change (drain plug torque 25 Nm (18 lbf ft))
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Triumph Bonneville T100 parts and maintenance specs
| Spec | Value |
|---|---|
| Engine | 900 cc liquid-cooled parallel twin, 270° crank (54.9 cu in) |
| Engine oil | 10W-40 or 10W-50, fully or semi-synthetic, API SN (or higher) and JASO MA2 |
| T100 oil capacity | 3.4 L (3.6 US qt) with filter; 3.2 L (3.4 US qt) without; 3.8 L dry fill |
| Oil filter | HiFlo HF204 or K&N KN-204-1 |
| Oil drain plug torque | 25 Nm (18 lbf ft) |
| Oil filter torque | 10 Nm (89 lbf in) |
| Spark plugs | 2 × NGK LMAR8A-9, gap 0.9 mm (+0.0/−0.1 mm), torque 12 Nm (9 lbf ft) |
| Coolant | 1.86 L Triumph D2053 OAT (premixed) |
| Fuel tank | 14.5 L (3.83 US gal) |
| Front tire | 100/90-18 56H |
| Rear tire | 150/70 R17 69H |
| Tire pressure (cold) | Front 32 psi (2.21 bar), rear 36 psi (2.48 bar) |
| Battery | YTX12-BS (12 V, 10 Ah) |
| Final drive | Chain, 102 links, sprockets 17/41 (front/rear) |
| Rear axle torque | 110 Nm (81 lbf ft) |
Engine oil for the T100
Triumph specifies 10W-40 or 10W-50 motorcycle oil, fully or semi-synthetic, API SN (or higher) and JASO MA2. Use a motorcycle-specific oil: car oils with friction modifiers can make the wet clutch slip.
- Shop 10W-40 or 10W-50 motorcycle oil
- Capacity with filter: 3.4 L (3.6 US qt). Fill to just below this, run the engine, then top up to the upper mark.
- Check the level with the bike upright on level ground after it has sat for a few minutes.
Triumph Bonneville T100 oil filter
The T100 takes a spin-on filter. HiFlo lists the HF204 for the liquid-cooled Bonneville family from 2016 on; the K&N equivalent is the KN-204-1 (or the KN-204C canister).
Tighten the filter to 10 Nm (89 lbf in) and the drain plug to 25 Nm (18 lbf ft) with a new sealing washer. Oil the filter’s rubber seal before fitting.
Tools for the job
- Torque wrench: the drain plug (25 Nm (18 lbf ft)) and spark plugs (12 Nm (9 lbf ft)) are easy to over-tighten.
- Oil filter wrench: for spin-on filters.
- Oil drain pan: holds the 3.8 L dry-fill volume with room to spare.
- Stand: a rear paddock stand or lift jack to hold the bike upright for an accurate oil level and chain work.
- Chain cleaner and lube: clean and lube the 102-link chain every 500 miles or after rain.
- Tire pressure gauge: cold pressures are 32 psi (2.21 bar) front and 36 psi (2.48 bar) rear.
- Battery tender: keeps the YTX12-BS topped up in storage.
Spark plugs
The T100 uses 2 × NGK LMAR8A-9, gapped at 0.9 mm (+0.0/−0.1 mm) and tightened to 12 Nm (9 lbf ft). Buy the exact part number: a different heat range can foul or overheat. Search NGK LMAR8A-9 on Amazon and check the listing title matches before you buy.
Air filter
Triumph doesn’t print an air filter part number in the owner’s handbook. Search by model and year (Triumph Bonneville T100 air filter) and confirm the listing names your exact model and year range. Reusable K&N-type filters need cleaning and re-oiling instead of replacement.
Battery
The handbook battery is the YTX12-BS (12 V, 10 Ah). Any battery sold as a direct YTX12-BS replacement fits the tray. A lithium swap saves weight but needs a lithium-compatible charger. Shop YTX12-BS batteries
Brake pads
The handbook doesn’t list brake pad part numbers, and calipers can differ between model years and trims. Before ordering, check the caliper brand stamped on the caliper body and your model year, then match the pads to both (search Triumph Bonneville T100 brake pads). Sintered pads suit most road riding. Fit pads in axle sets and bed them in gently for the first 200 miles.
Chain and sprockets
The stock final drive is a chain of 102 links with 17-tooth front and 41-tooth rear sprockets. Replace chain and sprockets together, and set slack to the figure in your owner’s handbook. Rear axle nut torque is 110 Nm (81 lbf ft).
Tires
| Position | Size | Cold pressure |
|---|---|---|
| Front | 100/90-18 56H | 32 psi (2.21 bar) |
| Rear | 150/70 R17 69H | 36 psi (2.48 bar) |
Triumph only approves specific tire pairs for each model (the list is on triumphtechnicalinformation.com). Buy front and rear as a matched pair of the same model, with load and speed ratings at least as high as stock. Search tire pairs in your sizes, and always check the size on your current sidewall first.
Tire pressure
Set pressures cold: 32 psi (2.21 bar) front, 36 psi (2.48 bar) rear. Check weekly; motorcycle tires lose a little air every few days.
Which year do I have? Triumph Bonneville T100 parts changes by year
Most Triumph Bonneville T100 parts for routine service (oil, oil filter, spark plugs and battery) are shared across all years covered here. Use this table to check what changed.
| Years | What changed | Parts affected |
|---|---|---|
| 2017–2020 | Launch of the liquid-cooled 900 cc T100 (the air-cooled 865 cc T100 ran 2002–2016) | Air-cooled T100 parts do not fit: different oil filter, plugs and battery |
| 2021–2026 | Euro 5 update | Same oil filter and plugs; check brake pads and tires by year |
Triumph Bonneville T100 parts FAQ
How much oil does a T100 take?
3.4 L (3.6 US qt) with a filter change, or 3.2 L (3.4 US qt) without. Use 10W-40 or 10W-50 motorcycle oil, fully or semi-synthetic, API SN (or higher) and JASO MA2.
What oil filter fits the T100?
The HiFlo HF204 (or HF204RC) and the K&N KN-204-1.
What spark plug does the T100 use?
2 × NGK LMAR8A-9, gapped at 0.9 mm (+0.0/−0.1 mm).
What tire size is the T100?
100/90-18 56H front and 150/70 R17 69H rear.
What tire pressure should I run on a T100?
32 psi (2.21 bar) front and 36 psi (2.48 bar) rear, set cold.
What battery does the T100 take?
The YTX12-BS (12 V, 10 Ah).
What is the T100 drain plug torque?
25 Nm (18 lbf ft), with a new sealing washer.
What oil does Triumph recommend for the T100?
10W-40 or 10W-50, fully or semi-synthetic, API SN (or higher) and JASO MA2. Triumph recommends its own Triumph Performance oil, but any oil meeting the spec is fine.
How many links is the T100 chain?
102 links, with 17/41 sprockets (front/rear).
Sister bikes and related guides
- Bonneville T120 (1200 cc version of the same chassis)
- Speed Twin 900 and Scrambler 900 (same 900 cc engine, same filter and plugs)
- More Triumph guides are coming; see all of them on our Triumph parts guides page.
Sources: Triumph Motorcycles, Owner’s Handbook: Speed Twin 1200, Speed Twin 900, Bonneville T100, Bonneville T120 and Scrambler 900 (Triumph publication 3850309-US); Triumph Bonneville T100 official model page; K&N oil filter fitment listings; Cafe Twin HiFlo HF204 fitment list. Always confirm against your own handbook and VIN.
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