RC 390 vs Duke 390
Same engine, sport bodywork
The RC 390 and Duke 390 share the same engine, frame, electronics. Differences: RC 390 has a sport fairing, low clip-on bars, rear-set foot pegs, lower-set seating position. The Duke 390 has tall-bar naked-bike ergonomics. Same DNA, two missions — track-day RC vs road-naked Duke.
Engine architecture
Single throughout
Every RC 390 has used the 373cc liquid-cooled DOHC single — KTM signature small-bike formula. KTM has not changed the engine across three generations of the RC 390. Improvements have come from chassis, brakes, electronics — not from the engine.
Why KTM only does small sport-bikes
Niche category
KTM does not make a 600cc or 1000cc sport-bike. The RC 390 (and previously the smaller RC 125 / RC 200) is the only sport-bike in the modern KTM range. Reasons: KTM brand is built on naked / adventure / off-road, not race-replica sport-bikes. The Bajaj-built small RC range works because India is a huge market for cheap sport-bikes; bigger sport-bikes do not fit KTM brand identity.
Power similar
−1bhp
44bhp 1st gen → 43bhp 3rd gen. Almost identical peak power — A2 limit is 47bhp, KTM has not pushed past that for any generation. 3rd gen has slightly more torque and makes power lower in the rev range, more usable.
Real cost change
−£750
RC 390 was £5,099 in 2016 (£6,650 today). RC 390 is £5,899 for 2026 — about 11% cheaper in real terms. KTM has held the price almost flat in real terms while adding cornering ABS, ride-by-wire, lean-sensitive TC, TFT, ride modes. Same value pattern as the Duke 390. RC 390 still uses the 373cc engine — the new 399cc LC4c motor from the redesigned Duke has not yet migrated to the RC.
Where it sits
Track-day specialist
The RC 390 is one of the few proper A2 sport-bikes left on the market — alongside the Aprilia RS 660 (more powerful but less A2-friendly), Yamaha YZF-R3 (smaller engine), and Kawasaki Ninja 400 (twin not single). The RC 390 is the most track-focused of the lot — light, sharp, sporty ergonomics, race-derived chassis.
Cheapest way in
£2.5k
A clean 1st-gen RC 390 from 2014-2018. The original — Bajaj-built, light, sharp, sporty. Single-cylinder so easy to maintain, A2-friendly out of the box. Probably the cheapest way to put a proper sport-bike in your garage. Track-day fans like these for the relatively low running costs and genuine race chassis feel.
