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BMW F 450 R

BMW F 450 R vs. KTM 390 Duke: Which Lightweight Naked Bike Fits You Better?

The BMW F 450 R brings a parallel twin and lower seat options; the 2026 US KTM 390 Duke lists less fully fueled weight and adjustable suspension.

By CarCody Team 4 min read
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The BMW F 450 R is the paper-fit choice if you want a parallel twin, BMW’s higher quoted peak torque, or lower published seat-height options. The 2026 KTM 390 Duke is the paper-fit choice if you prioritize a lower listed fully fueled weight and explicitly adjustable suspension. Those are specification-based distinctions, not verdicts from a head-to-head ride test. Availability also differs: BMW’s Netherlands announcement plans deliveries from summer 2027, while the KTM specifications cited here are for the 2026 US model.

How do the BMW F 450 R and KTM 390 Duke compare on paper?

Both are lightweight naked bikes with engines near 400 cc, but they use different layouts. BMW specifies a 420 cc parallel twin; KTM’s US 2026 model uses a 398.7 cm³ single-cylinder engine. The figures below come from the manufacturers, and the weight labels are not identical measurement terms.

Decision point BMW F 450 R KTM 390 Duke (2026 US specifications) What to consider
Engine 420 cc parallel twin 398.7 cm³ single-cylinder, liquid-cooled, four-stroke Choose the configuration you prefer; the cited sources do not establish comparative engine feel.
Published power 35 kW (48 hp) at 8,750 rpm 45 PS Keep the units and market context in view rather than treating these figures as directly interchangeable.
Published torque 43 Nm at 6,750 rpm 39 Nm BMW’s quoted peak is higher, but peak torque alone does not establish acceleration or how either bike feels.
Weight 175 kg, road-ready (BMW manufacturer specification) 165 kg, fully fueled (KTM US 2026 specification) KTM’s listed number is lower; the differing labels do not make these equivalent independent weigh-ins.
Seat height 775 mm low / 790 mm standard / 810 mm high 800 mm / 820 mm BMW offers the lower published option. Seat shape and rider proportions also affect reach.
Suspension Sport suspension listed on selected variants WP APEX 43 fork with compression and rebound adjustment; rear rebound and preload adjustment KTM’s cited page explicitly details adjustment. BMW equipment varies by configuration.
Display and connectivity 6.5-inch TFT and connectivity features described by BMW Not fully established by the cited KTM technical-specification page Check equipment on the exact local trim before buying.
Range BMW claims more than 350 km from a 14 L tank, at stated consumption of 3.8 L/100 km No matched consumption or range figure in the cited KTM page The available figures do not support a like-for-like range winner.
Price and timing Netherlands: €7,800 starting consumer price; availability planned from summer 2027 Price not stated on the cited US technical-specification page Compare local dealer prices and delivery timing for the same market and date.

Which engine and power figures matter to you?

BMW: parallel-twin configuration and quoted torque

BMW describes a fuel-injected 420 cc parallel twin producing 35 kW (48 hp) at 8,750 rpm and 43 Nm at 6,750 rpm. BMW also says 80% of available torque is present at 3,000 rpm. These are manufacturer figures, not measurements from an independent comparison. The parallel-twin layout and quoted torque may make the BMW the more appealing specification-sheet choice if those are your priorities; they do not prove that it accelerates harder or feels better than the KTM.

KTM: single-cylinder configuration

The cited US 2026 KTM specification lists a 398.7 cm³ liquid-cooled single-cylinder four-stroke engine, 45 PS, 39 Nm and a six-speed transmission. The 45 PS figure should remain in its published unit and US-model context when comparing it with BMW’s power figure.

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Which bike may be easier to manage at a stop?

BMW lists three seat choices: 775 mm low, 790 mm standard and 810 mm high. KTM US lists 800 mm and 820 mm. The BMW therefore has the lower published seat option, but seat height is only a first-pass screening measure: seat width, shape, suspension sag and rider proportions affect how easily a rider can reach the ground. If reach matters, sit on each bike in the exact seat configuration you would buy.

Does the KTM’s lower listed weight make it the better choice?

KTM lists the 2026 US 390 Duke at 165 kg fully fueled; BMW lists the F 450 R at 175 kg road-ready. KTM’s published figure is lower, but these manufacturer labels are not a standardized, side-by-side weigh-in. Treat the numbers as specifications for initial comparison, not a guarantee of how manageable either motorcycle will feel when moving it, turning slowly or riding it.

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Which suspension and equipment are documented?

KTM: adjustment details in the US specification

KTM specifies WP APEX 43 front suspension with compression and rebound adjustment, 150 mm of travel at both ends, and rear rebound adjustment with a preload adjuster. The same page lists a steel trellis frame, a 1,357 mm wheelbase, a 320 mm front disc and a four-piston radial fixed caliper.

BMW: equipment depends on configuration

BMW describes a 6.5-inch TFT display, LED lights and connectivity. Its release names Base, Exclusive, M Sport and M Sport with Innovation Package versions. Selected configurations include Shift Assistant Pro, Sport suspension, Riding Modes Pro and the Easy Ride Clutch package; the release does not make those features universal to every version. Verify the equipment included in the local trim and any packages you are considering.

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What do the announced price and availability tell you?

BMW Netherlands says the F 450 R is expected from summer 2027 with a starting consumer price of €7,800. That is a Netherlands-specific announcement, not a global price or confirmation of availability elsewhere. The cited KTM page covers US 2026 technical specifications and does not state a price. The available figures therefore do not establish a matched price comparison; ask local authorized dealers for current prices, exact equipment and delivery timing.

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Which lightweight naked bike fits your priorities?

  • Consider the BMW F 450 R if you value a parallel twin, BMW’s quoted 43 Nm peak torque, its lower optional seat, or the documented display and package choices. Its exact local configuration and delivery timing need dealer confirmation.
  • Consider the KTM 390 Duke if you value the lower listed fully fueled weight or want suspension adjustment spelled out in the cited specification. Its US-listed 800 mm seat option is higher than BMW’s 775 mm low seat.

Comfort over distance, vibration, actual acceleration, reliability, service experience, resale and owner satisfaction are not established by these specifications. If practical fit is decisive, sit on both motorcycles and verify the local model-year details before choosing.

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