Naked Motorcycles
2021KTM 390 Duke
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The 2021 KTM 390 Duke is a lightweight naked bike ideally suited for beginner and intermediate riders seeking an affordable entry into sportier motorcycling. Its nimble 373cc single-cylinder engine delivers 43 horsepower with sharp handling and aggressive styling, making it a popular choice for urban commuting and weekend riding. Known for excellent value, reliability, and approachable performance, the Duke 390 represents KTM's accessible performance platform.
- Capacity
- 373.0 ccm
- Engine
- Single, four-stroke
- Gearbox
- 6-speed
- Dry weight
- 149.0 kg
- Seat height
- 830 mm
- Power
- 42.9 HP (32.0 kW) @ 9000 RPM
What’s new for the 2021 KTM 390 Duke
vs the 2020| Spec | 2020 | 2021 |
|---|---|---|
| Dry weight | 139.0 kg (306.4 pounds) | 149.0 kg (328.5 pounds) |
| Front suspension | WP upside-down Ø 43 mm | WP Apex Ø 43 mm |
| Rear suspension | WP monoshock | WP Apex monoshock |
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Built primarily as a nimble city and canyon-carving streetfighter rather than a long-distance or off-road machine.
- Built for
- A punchy, single-cylinder naked bike with sharp handling, strong brakes, and an eager, playful attitude that rewards aggressive riding.
- Not ideal for
- Not the right choice for riders seeking a plush, wind-protected long-haul tourer or a capable off-road adventure companion.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Will it fit you?
Worked out in your browser - nothing is sent to usRange and running costs
Worked out in your browser - nothing is sent to usBased on the published US (EPA-style) fuel economy estimate and tank size. Real-world figures depend on how and where you ride, and the last litres of a tank are reserve. Prices shown greyed are examples - type your own.
Engine
- Capacity
- 373.0 ccm
- Power
- 42.9 HP (32.0 kW) @ 9000 RPM
- CO2 Emissions
- 91 CO2 g/km
- EPA Certificate No.
- MKTXC.373DKE-009
- EPA Est. Fuel Consumption
- 3.88 L/100km (60.6 US mpg)
- EPA CO Emissions
- 0.2 CO g/km
- Torque
- 37.0 Nm (3.8 kgf-m)
- Engine type
- Single, four-stroke
- Power/weight ratio
- 0.2879 HP/kg (dry)
- Bore x stroke
- 89.0 x 60.0 mm
- Cooling system
- Liquid
- Fuel system
- Injection
- Starting
- Electric
- Ignition
- Bosch EMS
- Aspiration
- Naturally aspirated
- Valves per cylinder
- 4
- Lubrication system
- Wet sump
Transmission
- Gearbox
- 6-speed
- Transmission type
- Manual
- Final drive
- Chain
- Clutch
- Wet multi-disc clutch / mechanically operated
Dimensions & weight
- Wheelbase
- 1357 mm
- Seat height
- 830 mm
- Dry weight
- 149.0 kg
- Wet weight
- 150.0 kg
- Fuel capacity
- 13.40 litres
- Ground clearance
- 175 mm
- Reserve fuel capacity
- 3.50 litres
Chassis & suspension
- Frame
- Steel trellis frame, powder coated
- Front suspension
- WP Apex Ø 43 mm
- Rear suspension
- WP Apex monoshock
- Front wheel travel
- 142 mm
- Rear wheel travel
- 150 mm
- Rake (fork angle)
- 24.0°
Brakes & wheels
- Front brakes
- Double disc. ABS. Four-piston radial fixed calliper.
- Front brakes diameter
- 320 mm
- Rear brakes
- Single disc. ABS. Single-piston floating calliper.
- Rear brakes diameter
- 230 mm
- ABS
- Yes
- Front tyre
- 110/90-17
- Rear tyre
- 150/60-17
Other
- Color options
- Black/orange/white
Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.
What changed, year to year
Differences highlighted| Specification | 2013 | 2016 | 2020 | 2021 | 2023 | 2026 |
|---|---|---|---|---|---|---|
| Capacity | 375 cc | 373 cc | 373 cc | 373 cc | 373 cc | 399 cc |
| Dry weight | — | 139 kg | 139 kg | 149 kg | 139 kg | 149 kg |
| Seat height | 800 mm | 800 mm | 830 mm | 830 mm | 830 mm | 820 mm |
| Fuel capacity | 11 L | 11 L | 13.4 L | 13.4 L | 13.4 L | 13.4 L |
Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.
Rider Reviews
Common questions
What is the engine size of the KTM 390 Duke?
The 2021 KTM 390 Duke has a Capacity of 373.0 ccm (22.76 cubic inches).
What engine power does the KTM 390 Duke have?
The 2021 KTM 390 Duke has a Power of 42.9 HP (32.0 kW) @ 9000 RPM.
How many gears does the KTM 390 Duke have?
The 2021 KTM 390 Duke has a Gearbox of 6-speed.
What is the torque of the KTM 390 Duke?
The 2021 KTM 390 Duke has a Torque of 37.0 Nm (3.8 kgf-m or 27.3 ft.lbs).
How much does the KTM 390 Duke weigh?
The 2021 KTM 390 Duke has a Dry weight of 149.0 kg (328.5 pounds).
Shop this bike
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The 2021 KTM 390 Duke is a naked bike that does exactly what it promises. The 373cc engine produces 42.9 hp and 37 Nm, which suits the bike's character well. With an 830 mm seat and a 150 kg weight, it is best suited to comfortable, upright everyday riding, although it is not built for long motorway trips or off-road riding. Overall, a solid choice for the right rider.
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