2025 · Supersport · Buyer's Guide
The Featherweight Corner Weapon
The RC 390 is built around one idea: a small, hard-edged sportbike that lets a rider work on line, lean, and braking without ever feeling overwhelmed. The 373 cc liquid-cooled single makes 44 hp at 9,000 rpm and 27 lb-ft at 7,000 rpm, and the whole package is light enough that those numbers land harder than they read. Cornering ABS, traction control, and ride modes come standard, as does a slipper clutch, a TFT display, and suspension you can adjust at both ends. That is a genuinely serious spec sheet for a bike this size, and it puts the RC in the sharp end of the small-bore supersport class.
Ridden hard, this thing is all about direction changes. It leans deep, changes line mid-corner without drama, and holds a steady arc at speed instead of running wide. City work is easy, running costs stay low, and the aftermarket support means an owner can keep building on it for years. Who it suits: a rider who wants to sharpen technique on tight, twisting roads or a circuit, not one chasing straight-line speed. That single runs out of breath on a long highway slog, and the riding position is committed. Neither is a flaw, but both are real.
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 |
Equipment check
Chassis
Connectivity
Drivetrain
Lighting
Safety
You notice the weight, or the lack of it, before you notice anything else. Pull it off the sidestand and the RC feels like a bicycle with an engine, and that impression never really leaves. The single thumps under you with a hard, mechanical pulse that comes up through the pegs and the tank, more character than annoyance once you're moving. Ergonomics are properly sporty. Wrists carry real load at a stop, knees tuck into the tank, and your body ends up in a shape that makes sense at speed and less sense in traffic. On a normal road pace it feels alert rather than frantic, the kind of bike you steer with your hips. LED lighting throws a clean, usable beam after dark. The whole machine sits close around you, and that closeness is the point.
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
Forget spec-sheet bragging. Here's who the RC 390 is actually built for.
On tight, technical canyon roads the RC is in its element: light, deep-leaning, and steady when you push. You'll ride it faster than bigger bikes there, though the run out of LA traffic to get to them is the price.
Made for Angeles Crest Highway · Coronado Trail / US 191 · Highway 1 / Big Sur
If you rate a ride by how cleanly you hit lines rather than how fast, this bike rewards you every corner. It's a skill-builder for tight twisties, not a comfortable way to cover the miles getting there.
Made for Back of the Dragon · Blue Ridge Parkway · Cherohala Skyway
Cheap to run, easy to lean over, and honest enough to teach you something on every lap. Cornering ABS and traction control back you up while you work on brake points and apex precision.
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 · 2022–2024
The A2 Corner Carver
Compare to the previous model →If this one isn't quite the fit, these are the bikes worth riding back-to-back against it.
