The Speed 400 is Triumph’s smallest roadster: a 398 cc single-cylinder “TR-Series” engine in a modern-classic roadster package that Triumph lists under its Classic range in the US. This is a spec-based overview, not a ride review. Figures are copied from Triumph Motorcycles USA’s Speed 400 specification page, checked on 22 October 2026.
A note on model year: Triumph’s US specification and model pages don’t state a model year. Triumph’s US offers page refers to “new 2026 Speed 400 models”, so we treat these as the current US figures for the 2026 model, but confirm with a dealer that the spec matches the bike you’re buying.
Triumph Speed 400 at a glance
| US price | From $5,495.00 (as listed by Triumph on 22 Oct 2026) |
| Engine | Liquid-cooled, 4 valve, DOHC, single-cylinder, 398.15 cc |
| Max power EC | 39.5 HP (40PS) @ 8,000 RPM |
| Max torque EC | 27.7 ft lb @ 6,500 rpm |
| Seat height | 31.10 in (790 mm) |
| Wet weight | 375 lb (170kg) |
| Tank capacity | 3.43 US gal (13 litres) |
| Source | Triumph Speed 400 specification |
Triumph Speed 400 price
Triumph’s US page lists the Speed 400 at “Price From $5,495.00” (as listed by Triumph on 22 Oct 2026). Triumph notes that the total selling price on its site combines the MSRP with a model-specific freight fee and estimated PDI and dealer fee, and excludes title, registration, taxes and other government fees; it doesn’t break those fees out on the model page. When we checked, Triumph’s offers page listed $350 Triumph Cash and finance rates from 0.00% for 36 months on new 2026 Speed 400 models; offers change, so check the page.
Triumph Speed 400 specs
Engine and transmission
| Type | Liquid-cooled, 4 valve, DOHC, single-cylinder |
| Capacity | 398.15 cc |
| Bore | 89.0 |
| Stroke | 64.0 |
| Compression | 12:1 |
| Max power EC | 39.5 HP (40PS) @ 8,000 RPM |
| Max torque EC | 27.7 ft lb @ 6,500 rpm |
| System | Bosch electronic fuel injection with electronic throttle control |
| Exhaust | Stainless twin-skin header system with stainless steel silencer |
| Final drive | X-ring chain |
| Clutch | Wet, multi-plate, slip & assist |
| Gearbox | 6 speed |
Triumph’s table gives bore and stroke without a unit; we copy them as published.
Chassis
| Frame | Hybrid spine/perimeter, tubular steel, bolt-on rear subframe |
| Swingarm | Twin-sided, cast aluminum alloy |
| Front wheel | Cast aluminum alloy 10 spoke, 17 x 3 in |
| Rear wheel | Cast aluminum alloy 10 spoke, 17 x 4 in |
| Front tire | 110/70 R17 |
| Rear tire | 150/60 R17 |
| Front suspension | 43mm upside down Big Piston forks. 140mm wheel travel |
| Rear suspension | Gas monoshock RSU with external reservoir and pre-load adjustment. 130mm wheel travel |
| Front brakes | 300mm fixed disc, four-piston radial caliper, ABS |
| Rear brakes | 230mm fixed disc, floating caliper, ABS |
| Instruments | Analogue speedometer with integrated multi-function LCD screen |
Dimensions, weight and service
| Width (handlebars) | 32.05 in (814 mm) |
| Height without mirror | 42.68 (1084mm) |
| Seat height | 31.10 in (790 mm) |
| Wheelbase | 54.21 in (1377 mm) |
| Rake | 24.6 º |
| Trail | 4.02 in (102 mm) |
| Tank capacity | 3.43 US gal (13 litres) |
| Wet weight | 375 lb (170kg) |
| Service interval | 10,000 miles (16,000km)/12 months (whichever comes first) |
Who the Speed 400 suits
The Speed 400 is for riders who want a small-capacity bike that looks like a classic roadster rather than a sportbike or streetfighter. On paper it’s easy to live with: a 790 mm (31.10 in) seat, 375 lb wet, a slip-and-assist clutch, ABS front and rear, and a 10,000-mile service interval. That last point matters for running costs, and it’s the longest interval quoted in the comparison below. New riders should check their state’s licensing rules first; our beginner motorcycle guide explains the steps, and the seat height guide helps you read the 790 mm figure.
Strengths and trade-offs (from the spec sheet)
- Long service interval. 10,000 miles or 12 months is the longest interval quoted by any bike in this comparison (KTM and Yamaha don’t quote one on these pages).
- Quality chassis parts. A 43mm big-piston upside-down fork, a radial four-piston front caliper and an external-reservoir shock, per Triumph.
- Retro instruments. An analog speedometer with an LCD screen rather than a TFT; some riders will want that, others won’t.
- Limited adjustment. Only rear preload is listed as adjustable.
- Model-year clarity. Triumph’s US pages don’t date their spec sheets, so double-check the spec on any bike you buy.
Speed 400 vs KTM 390 Duke vs Yamaha MT-03
| Model (model year) | US price (as listed 22 Oct 2026) | Engine | Seat height | Weight (as published) | Source |
|---|---|---|---|---|---|
| Triumph Speed 400 (current US model) | From $5,495.00 | 398.15 cc single; 39.5 HP (40PS) | 31.10 in (790 mm) | 375 lb (170kg) wet | Triumph |
| KTM 390 Duke (2026) | 5,499.00 USD + $600 freight | 398.7 cm³ single; 45 PS | 820/800 mm | 165 kg fully fueled | KTM |
| Yamaha MT-03 (2026) | $4,999 + $650 destination | 321cc inline twin | 30.7 in | 373 lb wet | Yamaha |
- KTM 390 Duke: the same money and nearly the same engine size, with more power on paper (45 PS vs 40PS), more adjustable suspension and a TFT, but a taller seat. It’s the sportier choice on the spec sheet. Read our 2026 KTM 390 Duke overview.
- Yamaha MT-03: about $500 cheaper with a lower 30.7 in seat and a 321cc twin. Yamaha doesn’t publish its power output.
Triumph Speed 400 FAQ
How much is the Triumph Speed 400 in the US?
Triumph lists it from $5,495.00 on its US Speed 400 page (checked 22 Oct 2026).
How much horsepower does the Speed 400 have?
Triumph lists 39.5 HP (40PS) at 8,000 RPM and 27.7 ft lb of torque at 6,500 rpm (EC figures).
What is the Speed 400 seat height?
31.10 in (790 mm), per Triumph.
How much does the Speed 400 weigh?
Triumph lists a wet weight of 375 lb (170kg).
How often does the Speed 400 need servicing?
Triumph quotes a service interval of 10,000 miles (16,000km) or 12 months, whichever comes first.
Before you buy
Licensing rules are set by each state, so check your state DMV (or equivalent) for the motorcycle license or endorsement you need, and consider a Motorcycle Safety Foundation course. You can look up any open safety recalls by VIN with NHTSA before buying a used example.
Sources
All figures were checked on the manufacturer pages on 22 October 2026. Manufacturers can change prices and specifications without notice, so check the linked page, and confirm with a dealer, before you buy.
- Triumph Motorcycles USA, Speed 400 specification
- Triumph Motorcycles USA, Speed 400 model page (price, pricing note)
- Triumph Motorcycles USA, Speed 400 offers (2026 model reference, offers)
- KTM USA, 2026 390 Duke technical specifications; price from KTM’s 390 Duke page
- Yamaha Motor USA, 2026 MT-03 specifications; price from the MT-03 model page