The Triumph Bonneville T40 is a 398 cc, single-cylinder modern classic with a six-speed gearbox, 30 bhp, lean-sensitive traction control and a 790 mm seat height. Triumph lists its wet weight at 421.1 lb and its fuel capacity at 3.8 US gal. Those figures describe a compact-looking but substantial motorcycle; fit and ease of handling still depend on the rider, and the manufacturer’s specifications are not a substitute for a test ride.
This guide covers the newly announced Bonneville T40 and T40 Black only. It does not use specifications from the T100, T120 or other Triumph 400 models. Figures below are manufacturer-published specifications; regional pages and equipment may vary. Triumph’s Bonneville T40 page is the reference for the listed specifications, while Triumph’s October 6, 2026 launch announcement describes the engine as a Bonneville-specific version of the TR Series.
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What are the Triumph Bonneville T40’s key specifications?
The T40 pairs a liquid-cooled 398 cc single with classic styling and contemporary electronic equipment. Triumph lists peak output at 30 bhp (22.8 kW) at 7,000 rpm and maximum torque at 36 Nm (26.6 lb-ft) at 5,000 rpm. The engine is a four-valve, double-overhead-camshaft design, with a six-speed gearbox and a wet, multi-plate slip-and-assist clutch.
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| Specification | Triumph-listed detail |
|---|---|
| Engine | Liquid-cooled, single-cylinder, four-valve DOHC |
| Capacity | 398 cc |
| Bore × stroke | 89 mm × 64 mm |
| Compression ratio | 12:1 |
| Maximum power | 32 PS / 30 bhp (22.8 kW) at 7,000 rpm |
| Maximum torque | 36 Nm (26.6 lb-ft) at 5,000 rpm |
| Fuel system | Bosch electronic fuel injection with electronic throttle control |
| Exhaust | Stainless twin-skin header system and stainless silencer |
| Clutch and gearbox | Wet, multi-plate slip-and-assist clutch; six-speed gearbox |
| Final drive | X-ring chain |
| Frame | Hybrid spine/perimeter tubular steel |
| Wheels and tires | Tube-type spoked aluminium rims; 100/90-18 front and 150/70 R17 rear |
| Suspension | Telescopic front forks and twin rear shocks with preload adjustment; 5.1 in listed travel at each end |
| Brakes | Single front disc, twin-piston axial caliper and OCABS; single rear disc, single-piston floating caliper and OCABS |
| Seat height | 790 mm / 31.1 in; optional accessory low seat listed at 30.3 in |
| Wheelbase | 1,418 mm / 55.83 in |
| Width × height | 818 mm / 32.2 in × 1,081 mm / 42.56 in |
| Wet weight | 421.1 lb |
| Fuel capacity | 3.8 US gal |
| Instruments | 4-inch circular full-color TFT with Triumph Navigation |
| Emissions standard | Euro 5+ as listed on the accessed manufacturer page |
These are specifications, not independent test results. They do not establish acceleration, vibration, engine heat, braking distances or highway comfort. Triumph’s page also lists fuel consumption under regulatory test conditions; actual consumption varies with conditions and use, so tank capacity alone cannot establish a dependable riding range.
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The output is also shown as 32 PS, 30 bhp and 22.8 kW: these are alternative units for Triumph’s listed peak power, not three separate performance figures. Likewise, the metric torque figure and its 26.6 lb-ft equivalent describe the same listed maximum. The rpm values matter: 36 Nm is stated at 5,000 rpm and peak power at 7,000 rpm. They identify the engine speeds at which the manufacturer lists those maxima, but do not provide a complete power curve.
How is the T40 engine different from a generic 400 cc single?
Triumph describes the engine as a dedicated Bonneville version of its 400 cc TR Series, with a Bonneville-specific tune. The company says a revised cylinder head and camshafts are intended to provide more torque lower in the rev range. That is the manufacturer’s description of the design aim, not a verified claim about real-world acceleration or flexibility.
The 36 Nm peak arrives at 5,000 rpm, while the stated 30 bhp peak is at 7,000 rpm. These figures tell you where Triumph lists the engine’s maximums, but not how it feels through the rev range or how it performs under load. Triumph calls the exhaust a stainless twin-skin header system with a stainless silencer and presents the silencer as peashooter-style. Its descriptions of a lower idle and distinctive exhaust note are product claims, not independent acoustic measurements.
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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →The engine’s liquid cooling, four valves and DOHC layout are part of the published specification, as are Bosch electronic fuel injection and electronic throttle control. In plain terms, the brochure confirms an electronically managed fuel system and throttle rather than a carburetor-operated setup. Triumph’s published information does not provide independent data on fuel response, heat management, vibration or output under different loads, so those should be judged through a relevant test ride and not inferred from the component list.
Triumph’s launch material calls it a proven 400 cc TR Series engine adapted for the Bonneville. That wording is the manufacturer’s positioning; the specific specification to carry forward is that this is a 398 cc engine with a dedicated Bonneville tune. Do not substitute output or equipment figures for another Triumph 400 or a larger Bonneville merely because the names or styling are related.
What electronics and rider aids are included?
Triumph lists electronic throttle control (ride-by-wire), five riding modes and lean-sensitive traction control. The instrument display is a 4-inch circular full-color TFT with Triumph Navigation. Triumph’s published information does not establish the riding-mode names or explain their individual settings, so those details should be checked in the owner’s manual for the relevant market rather than inferred from the mode count.
Lean-sensitive traction control is an electronic aid, not a guarantee against loss of grip. Tires, road surface, speed and rider inputs still matter. The specifications also list OCABS at both brakes; consult the market-specific manual for the precise system description and operation.
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The TFT and navigation listing indicate that the T40 combines a round, classic-looking instrument format with a color display and navigation feature. The manufacturer information here does not detail phone pairing, map availability, subscription requirements or interface behavior, so check the current country-specific product page or manual if those functions are important to your buying decision. Similarly, five modes gives the number of modes but not their names or the exact changes each makes.
Will the T40 fit your body and everyday use?
Seat height and weight
The standard seat height is 790 mm (31.1 in). Triumph lists an accessory low seat that brings the stated height to 30.3 in. The lower seat may be worth considering if the standard position feels too tall, but seat height alone does not determine whether a rider can put both feet down or move the bike comfortably. Inseam, seat shape, suspension sag, footwear and confidence all affect fit.
Triumph lists wet weight at 421.1 lb. That figure is useful for comparison and planning, but it does not by itself predict how manageable the motorcycle will feel when stopped, pushed or turned around. If possible, sit on the T40 in riding gear and assess low-speed balance before deciding.
Consider the figures together rather than treating either as a pass-or-fail test. A lower accessory seat changes the stated seating height, but Triumph’s published specifications do not quantify how that affects seat shape or comfort. Ask a dealer to confirm accessory availability and fitment for your market, then try the actual configuration where possible. The width, reach to the controls and how the bike balances at a stop can matter as much as the headline seat-height number.
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The T40 has a 1,418 mm (55.83 in) wheelbase, is 818 mm (32.2 in) wide and 1,081 mm (42.56 in) high, according to Triumph. It uses an 18-inch front wheel and 17-inch rear with tube-type tires: 100/90-18 at the front and 150/70 R17 at the rear. The spoked aluminium rims and tube-type setup are relevant when planning tire repairs: do not assume a puncture can be handled exactly like a tubeless tire. Triumph lists 5.1 in of travel at both ends, with preload adjustment on the twin rear shocks.
The hybrid spine/perimeter tubular-steel frame, telescopic front forks and twin rear shocks are the manufacturer’s stated chassis components. The only adjustment specifically listed by Triumph is rear-shock preload; do not assume additional suspension adjustment. Likewise, the listed travel figures describe suspension movement, not a promise about comfort or suitability for a particular road. Those are subjective matters that depend on load, setup, surfaces and rider preference.
The tire sizes are useful when checking replacement availability or discussing a repair, but they do not by themselves establish tire brand, compound or grip characteristics. The tube-type designation is especially worth noting before long trips: confirm the correct roadside repair approach and equipment with the owner’s manual or a qualified shop rather than treating the wheels as tubeless.
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Fuel, parking and chain care
The listed tank capacity is 3.8 US gal. Because fuel-consumption figures are regulatory-test results rather than a promise of real-world economy, multiplying a test figure by tank capacity would not yield a guaranteed range. Plan fuel stops conservatively until you have experience with your own riding conditions.
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The X-ring chain requires routine inspection, cleaning, lubrication and adjustment according to the owner’s manual. Triumph fits a center stand as standard and says it makes chain cleaning easier. A motorcycle chain brush can be a useful general-purpose tool, but the manufacturer page does not endorse a specific brush or brand; use compatible chain-care products and follow Triumph’s maintenance instructions.
A center stand can also help when parking and carrying out chain checks, though the product material specifically calls out everyday ownership and chain cleaning rather than promising any particular repair capability. Because the bike is chain-driven, chain condition remains an ownership task even with the stand fitted. Use the prescribed inspection and adjustment procedure for this model; Triumph’s published information does not supply a chain slack measurement or product-specific cleaning instructions.
What does the service interval mean for ownership?
Triumph states a 10,000-mile service interval and describes it as a way to reduce visits and downtime. Treat that as the manufacturer’s stated interval, not as a guarantee of total maintenance cost or an indication that every inspection and consumable can be ignored between services. The owner’s manual and service schedule for the motorcycle’s country and model year govern the required checks, fluids and adjustments.
The figure alone does not establish insurance costs, reliability, resale value or the frequency of wear-item replacement. Those depend on location, use, maintenance history and individual circumstances; the published specification does not quantify them.
Triumph calls the interval “class-leading” in its product materials, but that is promotional language rather than an independently verified comparison. The useful practical fact is the stated 10,000-mile interval; the full schedule still matters. Before purchase, check whether the market-specific schedule includes time-based items or interim checks, and ask a dealer about local labor and parts pricing if budgeting is a priority. Triumph’s published information does not provide service prices or total cost of ownership.
What should you verify before buying?
The available specifications establish the T40’s core engine, dimensions, equipment and capacities, but they do not establish a regional price, on-sale date, warranty terms, insurance cost or independent riding performance. Triumph’s specification page should be checked for the country where you plan to buy, and the relevant market’s current owner documentation should be used for servicing and mode details.
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- Confirm the exact model and country specification: the T40 and T40 Black are the subject here, not the T100, T120 or a different 400 model.
- Check that the low seat is listed and available as an accessory in your market if the 30.3-inch figure matters to you.
- Review the market-specific manual for riding-mode operation, maintenance procedures and the prescribed schedule.
- Assess the tube-type wheel setup and chain-drive maintenance as part of your intended use, rather than relying on styling or headline capacity figures alone.
The T40 Black is identified alongside the standard T40 in Triumph’s launch materials, but the available specifications do not establish which details differ between the versions. Compare the local model pages and equipment lists directly rather than assuming a color or trim name means a particular mechanical change. No like-for-like competitor comparison is established by Triumph’s published information, either; a fair comparison would need verified prices, outputs, weights, seat heights, capacities, equipment, service intervals and warranty information for the same market.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Frequently asked questions
How much power and torque does the Bonneville T40 make?
Triumph lists 30 bhp (22.8 kW, or 32 PS) at 7,000 rpm and 36 Nm (26.6 lb-ft) at 5,000 rpm. These are manufacturer specifications, not independent dynamometer results.
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Triumph lists a wet weight of 421.1 lb. The figure is useful as a reference, but it cannot alone predict how easy the motorcycle will feel to balance or maneuver; try the bike if handling at low speed is a concern.
What is the Bonneville T40 seat height?
The listed standard seat height is 790 mm (31.1 in). Triumph also lists an optional accessory low seat at 30.3 in. Confirm its availability in your market and assess the actual seating position before relying on the lower figure.
Does the T40 have traction control and riding modes?
Yes. Triumph lists lean-sensitive traction control and five riding modes, along with ride-by-wire/electronic throttle control. Triumph’s published information does not establish mode names or individual behavior; consult the applicable owner’s manual.
What is the Triumph Bonneville T40 fuel capacity, and what range can it cover?
The listed capacity is 3.8 US gal. The available fuel-consumption figures are regulatory-test results and may not match real use, so Triumph’s published information does not support a guaranteed range. Actual distance between fill-ups varies with riding conditions and use.
What service interval does Triumph quote for the T40?
Triumph states a 10,000-mile service interval. This is not a complete maintenance-cost estimate or permission to skip checks between scheduled services; follow the current market-specific manual and service schedule.
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