2025 · Supermoto · Buyer's Guide
Small Package, Pure Hooligan
KTM builds this one around a 399 cc liquid-cooled single, and the numbers tell you what it wants to be: 45 hp at 8,500 rpm and 29 lb-ft at 7,000 rpm, running through a six-speed box and a chain. The chassis is the steel trellis you know from the 390 Duke, hung with long-travel WP suspension that is adjustable at both ends and clearly tuned for asphalt rather than dirt. The rider-aid package is genuine: ABS, traction control, ride modes, plus a TFT dash with smartphone connectivity, a USB port and an LED headlight. Supermoto shape, street-bike manners.
This is a road bike first, not a race machine wearing plates, and that is the honest frame to judge it in. It suits the rider who wants to work for the fun, who reads twisty roads for corner speed instead of straight-line numbers, and who also has to survive Monday traffic on the same bike. Running costs stay low, the chain and the single keep servicing simple, and the aftermarket gives you plenty of room to make it yours. The caveats: it carries nothing, the seat sits high and stays where it is, and two recalls are on the record. Confirm both before money changes hands.
Spec sheets don't ride bikes, but they set the baseline.
| Power | 45 hp (33 kW) @ 8,500 rpm |
|---|---|
| Torque | 29 lb-ft (39 Nm) @ 7,000 rpm |
| Displacement | 399 cc |
| Engine | Single-cylinder |
| Cooling | Liquid-cooled |
| Gearbox | 6-speed |
| Final drive | Chain |
| Fork | Upside-down (USD) |
| Front brake | 320 mm |
| Wheelbase | 57.2 in (1453 mm) |
| Ground clearance | 10.6 in (269 mm) |
| Front travel | 9.0 in (229 mm) |
| Rear travel | 9.0 in (229 mm) |
Equipment check
Chassis
Safety
What follows comes from years of listening: paddock talk, owner chats on club nights, and the emails and messages riders send me directly. On the 390 SMC R the pattern is clear. Owners talk mostly about how much bike they get for the money, and the complaints are few and scattered.
Value comes up more than anything else. Riders consistently say the SMC R costs less than most rivals and still brings a stronger engine and better electronics. They point to two ride modes, traction control with several levels and three ABS settings, which is rare at this price. The engine gets its own praise: it pulls hard through the mid-range, the fueling is smooth, and owners enjoy chasing its raucous top end. In corners they call it precise and eager, on the road and on track.
The gripes are thin. Some riders note that the bike has no fairing or screen, so at highway speed you take the full wind blast. Some owners also hesitate about long-term ownership because of KTM's past reluctance to honor warranty claims, though they say the brand has improved recently.
Side stand spring breakage (recall)
Engine vibrations may cause the forged side stand spring to break, allowing the stand to deploy unexpectedly. KTM recalled affected models to replace the spring and add rubber protection.
ECU software-induced stalling (recall)
A fault in the ECU engine management software can cause the engine to stall at low RPMs, especially during clutch engagement. A software update resolves the issue.
Where this KTM 390 SMC R 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 390 SMC R is actually built for.
Fits your week almost perfectly: it slices city traffic during the commute and then plays hard on the ridge roads. Modern dash, easy to live with. Long freeway transits are the part it enjoys least.
Made for Bay Area Ridge Roads · San Francisco / Bay Area · Skyline Boulevard / Alice's Restaurant
If your fun comes from corner speed rather than horsepower, this fits the canyons well. Just be honest with yourself: 45 hp means you carry momentum instead of blasting the straights.
Made for Angeles Crest Highway · Coronado Trail / US 191 · Highway 1 / Big Sur
On the tight, twisty Hill Country stuff it is a riot, and it costs little to keep. The long, flat runs to get there and back are where the single and the missing luggage will annoy you.
Made for Austin / Texas Hill Country · Twisted Sisters · Austin / Handbuilt Motorcycle Show
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 390 SMC R. “cheaper/pricier” is what that bike costs second-hand, not how worn it is.
