2022–2024 · Supersport · Buyer's Guide
The A2 Corner Carver
The RC 390 builds its whole case around one liquid-cooled 373 cc single making 44 hp and 27 lb-ft, hung in a chassis that takes the job seriously. Adjustable upside-down fork, adjustable shock, a 320 mm front disc, slipper clutch, plus cornering ABS and traction control as standard rider aids. That is genuine sportbike hardware at this displacement, and it shifts what the small-supersport class is allowed to be. Mass is low, the steering geometry is sharp, and the electronics exist to widen the safety margin rather than to cover for a soft frame.
This is a bike for riders who measure a road by its corners, not by its straights. It flatters commitment: get the entry right and it holds the line with a calm you don't expect from something this compact. It ages cleanly too, with a chain, modest consumables, and no fragile luxury systems to fail. The honest caveat is that there are no ride modes to hide behind, the 3.6 gal (13.7 L) tank and 32.4 in (824 mm) seat make long interstate transits a chore, and 44 hp means you make time by carrying speed, not by opening the throttle.
Spec sheets don't ride bikes, but they set the baseline.
| Power | 44 hp (32 kW) @ 9,000 rpm |
|---|---|
| Torque | 27 lb-ft (37 Nm) @ 7,000 rpm |
| Displacement | 373 cc |
| Engine | Single-cylinder |
| Cooling | Liquid-cooled |
| Gearbox | 6-speed |
| Final drive | Chain |
| Fork | Upside-down (USD) |
| Front brake | 320 mm |
| Front tire | 110/70-17 |
| Rear tire | 150/60-17 |
| Seat height | 32.4 in (824 mm) |
| Fuel capacity | 3.6 gal (13.7 L) |
Equipment check
Chassis
Connectivity
Drivetrain
Lighting
Safety
Over the years I've collected what RC 390 owners tell me in paddock conversations, over coffee on club nights, and in the emails and messages riders send me directly. On the 2022 to 2024 bike the pattern holds steady. Owners rave about how it handles and how friendly the engine is. The doubts that keep coming back are about how it holds up over time.
Riders consistently call the handling agile and precise, and they say it builds confidence on public roads as much as on track days. The same owners describe the engine as peppy, with strong mid-range and a powerband friendly enough to flatter novices and experienced riders alike. The suspension earns praise too: plush on real roads, supportive at the track, and easy to adjust by hand. A few riders single out the brakes for strong stopping with plenty of feel.
The most common worry is long-term reliability. KTM has a reputation for occasional niggling faults, and early owner reports back that up. The other complaints come up only now and then. Some taller riders find the pegs high and the forward lean tiring on longer rides. Others say the single gets chattery around town and needs careful clutch and gear work.
E-throttle failure causing sudden idle (Recall 26V196)
Moisture can migrate into the electronic throttle's connector, eroding contacts. The ECU detects a voltage deviation and sets the engine to idle speed, causing loss of motive power. Affects 2022-2024 RC 390 models; remedy is replacement with improved e-throttle.
Intermittent quickshifter malfunction
Some owners report the quickshifter operates erratically or has 'a mind of its own', affecting smooth up- and downshifts.
Early fork seal weeping
At least one owner observed fluid on the left fork leg at 460 miles, indicating a potential fork seal leak.
Where this KTM RC 390 pulls ahead of — or falls behind — its rivals on the numbers, and the typical bike in its class on character.
Power
Torque
Displacement
Seat height
Forget spec-sheet bragging. Here's who the RC 390 is actually built for.
On Angeles Crest this rewards momentum instead of horsepower, and it makes you a sharper rider for it. In a group that drag-races the straights, you'll be working the gearbox to stay in touch.
Made for Angeles Crest Highway · Coronado Trail / US 191 · Highway 1 / Big Sur
Tight, repetitive second-gear corners are exactly where this bike lives, and the feedback teaches you something every lap. The slab ride in from Atlanta on a 3.6 gal tank is the price you pay.
Made for Back of the Dragon · Blue Ridge Parkway · Cherohala Skyway
One of the cheapest honest ways to log real track miles: huge lean clearance, adjustable suspension at both ends, cornering ABS as backup. Just accept you'll be passed on every straight.
Made for Barber Motorsports Park · WeatherTech Raceway Laguna Seca · Circuit of the Americas
If you're cross-shopping the older generation, here's what changed.
Previous generation · 2017–2021
One Cylinder, All Attack
Compare to the previous model →If this one isn't quite the fit, these are the bikes worth riding back-to-back against it.
Any price note compares both bikes at the same age — the youngest age both have on the used market — against this KTM RC 390. “cheaper/pricier” is what that bike costs second-hand, not how worn it is.
Successor · 2025
Competitor · 2019–2024
Light, Sharp, Rev It Hard
~$1,100 pricier used than this bike at 3 yr
Competitor · 2018–2024
Light Weight, Sharp Lines
~$300 pricier used than this bike at 4 yr
Competitor · 2024
Accessible Supersport, Surprisingly Sharp
Competitor · 2024–2025
Four Cylinders, Four Hundred CCs
~$3,600 pricier used than this bike at 2 yr
Same Platform · 2024
Electronics Punch, Featherweight Frame
~$200 cheaper used than this bike at 2 yr