KTM calls the 390 Duke “the corner rocket”. The current generation uses a 398.7 cm³ single-cylinder LC4c engine, a steel trellis frame with a die-cast aluminum subframe, and adjustable WP APEX suspension, according to KTM USA’s 2026 390 Duke page. This is a spec-based overview, not a ride review: every figure is copied from KTM USA’s 2026 model page and technical specifications, checked on 22 October 2026. KTM publishes most figures in metric units, and we quote them exactly as published rather than converting them.
2026 KTM 390 Duke at a glance
| US MSRP | 5,499.00 USD base MSRP (as listed by KTM on 22 Oct 2026; plus freight: $600) |
| Engine | 1-cylinder, 4-stroke engine, 398.7 cm³ |
| Power / torque | 45 PS / 39 Nm |
| Seat height | 820/800 mm |
| Weight fully fueled | 165 kg |
| Source | KTM 2026 390 Duke technical specifications |
KTM lists two seat height figures (820/800 mm) on the spec page without explaining them there. Ask a KTM dealer which applies to the bike you’re looking at.
2026 KTM 390 Duke price
KTM lists the 2026 390 Duke at 5,499.00 USD base MSRP, plus a $600 freight charge (MSRP as listed by KTM on 22 Oct 2026). KTM’s page also says street models from model year 2025 onward come with its Premium Manufacturer’s Warranty of up to four years, provided services are done on schedule at an authorized KTM dealer. Check the terms on KTM’s warranty page.
2026 KTM 390 Duke specs
Engine
| Design | 1-cylinder, 4-stroke engine |
| Displacement | 398.7 cm³ |
| Power | 45 PS |
| Torque | 39 Nm |
| Transmission | 6-speed |
| Cooling | Liquid cooled |
| EMS | Bosch EMS with RBW |
| CO2 emissions | 79 g/km |
| Engine oil | Motorex Formula 4T 15W/50 |
Chassis and suspension
| Frame design | Steel trellis frame, powder coated |
| Front suspension | WP APEX 43 |
| Front suspension adjustment | Compression and rebound adjustable |
| Rear suspension adjustment | Rebound adjustable; preload adjuster |
| Suspension travel (front / rear) | 150 mm / 150 mm (5.91 inch / 5.91 inch) |
| Front brake | Four-piston radial fixed caliper; 320 mm disc |
| Rear brake disc diameter | 240 mm |
| Chain | 520 X-Ring |
Dimensions and weight
| Seat height | 820/800 mm |
| Wheelbase | 1357 mm |
| Weight fully fueled | 165 kg |
KTM’s US spec page doesn’t list fuel capacity, so we leave it out.
Who the 390 Duke suits
The spec sheet points to a rider who wants a light, sharp-handling small bike with more adjustability than usual at this price: a fork with compression and rebound adjustment, a rebound- and preload-adjustable shock, a five-inch TFT, ride modes and, per KTM, Launch Control in TRACK mode. It’s a single, so expect a different character from the twins it competes with. Riders new to motorcycling should read our beginner motorcycle guide; the 390 Duke’s weight is modest, but its seat (820/800 mm) is taller than some rivals, so see our seat height guide for what that number means in practice.
Strengths and trade-offs (from the spec sheet)
- Adjustable suspension. Adjustable compression and rebound damping at the front is unusual in this price range; the rivals below list no fork adjustment at all.
- Strong brake spec. A 320 mm front disc with a four-piston radial caliper, the largest front disc here.
- Light. 165 kg fully fueled.
- Metric-only data. KTM’s US page gives weight, seat height and wheelbase in metric only, which makes side-by-side comparison with US-unit spec sheets harder. Don’t rely on rounded conversions you find elsewhere.
- Freight. At $600, the freight charge is a bigger share of the price than on more expensive bikes.
390 Duke vs Triumph Speed 400 vs Kawasaki Z500
| Model (model year) | US MSRP (as listed 22 Oct 2026) | Engine | Power (as published) | Seat height | Weight (as published) | Source |
|---|---|---|---|---|---|---|
| KTM 390 Duke (2026) | 5,499.00 USD | 398.7 cm³ single | 45 PS | 820/800 mm | 165 kg fully fueled | KTM |
| Triumph Speed 400 (current US model) | $5,495.00 | 398.15 cc single | 39.5 HP (40PS) @ 8,000 RPM | 31.10 in (790 mm) | 375 lb (170kg) wet | Triumph |
| Kawasaki Z500 ABS (2027) | $5,799 | 451cc parallel twin | 51.0 hp @ 10,000 rpm (ISO 4106) | 30.9 in | 368.2 lb curb (50-State) | Kawasaki |
- Triumph Speed 400: almost exactly the same price and engine size, but a retro roadster rather than a streetfighter. Triumph lists a lower 790 mm seat and a 43mm big-piston fork with no listed adjustment. See our Triumph Speed 400 overview.
- Kawasaki Z500: $300 more for a 451cc twin with the highest published power of the three. Kawasaki lists only rear preload adjustment.
Power figures in this table use different units and test methods (KTM in PS, Triumph EC, Kawasaki ISO 4106), so treat them as a rough guide rather than an exact ranking.
KTM 390 Duke FAQ
How much is the 2026 KTM 390 Duke?
5,499.00 USD base MSRP plus $600 freight, as listed on KTM USA’s page on 22 Oct 2026.
How much power does the 390 Duke make?
KTM lists 45 PS and 39 Nm.
What is the 390 Duke seat height?
KTM lists 820/800 mm.
How much does the 390 Duke weigh?
KTM lists 165 kg fully fueled.
Is the 390 Duke really 390cc?
KTM lists the displacement as 398.7 cm³ and says the latest LC4c engine has a 399 cc capacity.
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.
- KTM USA, 2026 KTM 390 Duke technical specifications
- KTM USA, 2026 KTM 390 Duke (MSRP, freight, features, warranty)
- Triumph Motorcycles USA, Speed 400 specification; price from Triumph’s Speed 400 page
- Kawasaki USA, 2027 Z500 ABS