2021-2022 KTM 390 Duke Review: The Pocket-Sized Corner Rocket

Introduction

The KTM 390 Duke has always been the rowdy younger sibling in KTM's naked bike family, and the 2021-2022 iteration takes this reputation to thrilling new heights. Designed as a gateway to KTM's "Ready to Race" philosophy, this 373cc single-cylinder machine packs a punch that defies its modest displacement. Over two days of riding through city streets, mountain passes, and tight backroads, I discovered why this bike has become a cult favorite among new riders and seasoned motorcyclists alike.

Design & Ergonomics: Aggressive Minimalism

At first glance, the 390 Duke could easily be mistaken for its larger 890 Duke sibling. The signature split-LED headlight – resembling a futuristic robot's glare – dominates the front profile, while the exposed steel trellis frame and orange-anodized suspension components scream KTM's performance DNA.

With an 830 mm (32.7") seat height, the Duke accommodates riders of varying statures comfortably. The narrow mid-section makes grounding feet effortless, though the slightly firm seat had me shifting position during longer rides. The redesigned 13.4-liter tank (3.54 US gal) features clever knee indents that lock riders in during aggressive cornering.

Color options are pure KTM theater:
- Orange/Black: The classic combo radiating track-ready energy
- White/Black: A cleaner look that highlights the trellis frame
- Gray/Black: Stealth mode for urban ninjas

The 5" TFT display deserves special mention. Unlike cheaper LCD units in competitors, this full-color dash serves up crisp gear indicators, fuel economy stats, and even a lap timer – because why shouldn't your commute feel like a MotoGP warm-up?

Performance: Small Bore, Big Roar

Engine Character:
The liquid-cooled 373cc DOHC engine isn't just powerful for its class – it's characterful. With 44 HP (32 kW) @ 9,500 RPM and 37 Nm (27.3 lb-ft) @ 7,000 RPM, the Duke pulls harder than its 150 kg (330 lbs) dry weight suggests. Below 5,000 RPM, it's docile enough for traffic crawls. Cross 6,000 RPM and the engine transforms – the intake howl intensifies, the chassis stiffens, and the bike surges forward like an over-caffeinated Jack Russell.

The ride-by-wire throttle delivers crisp response, though the optional Quickshifter+ (available as an accessory) elevates the experience. Upshifts at redline are met with satisfying throttle blips, while downshifts are butter-smooth thanks to the slipper clutch.

Real-World Performance:
- 0-60 mph (0-97 km/h): 5.1 seconds (manufacturer claim)
- Top speed: 170 km/h (105 mph) indicated
- Fuel efficiency: 30-35 km/l (70-82 mpg) with gentle riding

The Bosch EMS deserves praise for seamless cold starts and linear power delivery. However, the Euro5 compliance comes at a cost – some low-RPM jerkiness when crawling in traffic.

Handling & Suspension: Ballet Dancer Physics

Chassis Dynamics:
The steel trellis frame and 43mm WP APEX USD forks (142mm travel) create a near-telepathic connection to the front wheel. At 1357 mm (53.4") wheelbase, direction changes happen at thought-speed. Combine this with sticky 110/70-17 (front) and 150/60-17 (rear) Metzeler Sportec tires, and you've got a bike that laughs at hairpins.

Key handling specs:
- Rake: 24° (65° steering head angle)
- Trail: 93.4mm
- Ground clearance: 175mm (6.9")

During aggressive cornering, the Duke's 32.7" seat height becomes an asset – there's ample room to hang off, and the pegs only scrape when you're really committed. The WP APEX rear monoshock (150mm travel) offers preload adjustment, dialing in from solo commuting to two-up weekend rides.

Braking Performance:
ByBre (Brembo's budget line) supplies the hardware:
- Front: 320mm disc with radial 4-piston caliper
- Rear: 230mm disc with single-piston caliper

ABS intervention is subtle in Street mode, while Supermoto mode (disengages rear ABS) lets experienced riders explore the Duke's hooligan potential. Initial bite is strong but progressive – no wooden feel here.

Competition: Class of 2021

Yamaha MT-03:
- 321cc parallel-twin
- Smoother engine but softer suspension
- Lacks TFT dash and aggressive styling

Honda CB300R:
- Neo-retro design appeals to different crowd
- 286cc single feels underwhelming above 100 km/h
- Superior fit/finish but higher price

BMW G 310 R:
- 313cc reverse-cylinder engine
- More relaxed ergonomics
- Brand prestige but lower spec components

The 390 Duke dominates in suspension quality and tech features. However, riders prioritizing vibration comfort may prefer the MT-03's twin, while Honda loyalists will appreciate the CB300R's refinement.

Maintenance: Keeping the Beast Happy

Key Service Intervals:
- Oil changes: Every 7,500 km (4,660 miles) with 15W-50 API SH oil
- Valve clearance checks: Every 15,000 km (9,320 miles)
- Intake: 0.10-0.15mm (cold)
- Exhaust: 0.15-0.20mm (cold)
- Chain adjustment: Every 500 km (310 miles)
- 520 X-ring chain requires regular lubrication

Pro Tips from MOTOPARTS.store:
1. Upgrade brake pads: Swap stock pads for sintered variants (available in-store) for improved bite
2. Air filter mods: High-flow filters unlock better throttle response
3. Cooling system care: Use ethylene glycol-based coolant mixed 50:50 with distilled water
4. Tire pressure monitor: Our Bluetooth TPMS kits prevent mishaps from the stock 2.0/2.2 bar (29/32 psi) settings

Common Owner Quirks:
- The LED headlight's focused beam benefits from auxiliary lights for country roads
- Stock mirrors vibrate at high RPM – consider bar-end replacements
- The 13.5L tank's shape makes aftermarket tank bags tricky – we recommend tail packs

Verdict: More Than Just a Beginner Bike

The 2021-2022 KTM 390 Duke isn't just A2-license compliant – it's a masterclass in accessible performance. While the single-cylinder vibes remind you of its economy roots, the chassis and electronics package shame bikes twice its price.

For urban warriors, it's a flickable lane-splitter. For canyon carvers, a confidence-building tool. And for MOTOPARTS.store customers, a blank canvas for customization – whether that's upgrading suspension components or adding crash protection for track days.

Yes, the seat could be plusher, and the engine gets buzzy on highways. But find a twisting backroad, click into third gear, and none of that matters. The Duke doesn't just ride – it grins. And chances are, you will too.

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