Engine architecture
Single → V-twin throughout
The 620 Duke was a single (LC4). The 990 Super Duke moved to V-twin (LC8) in 2005, and every Super Duke since has been a 75° V-twin. KTM has stuck with the V-twin layout for 20+ years even as rivals went to inline-fours and triples.
Power gain
+140bhp
50bhp 620 Duke → 190bhp 1390 Super Duke R. Nearly four times the power. Hyper-naked category did not exist when the 620 Duke launched — by 2026 the Super Duke makes more power than most superbikes did 10 years ago.
Real cost change
+£7.8k
620 Duke was £5,000 in 1996 (£10,000 today). The 2026 Super Duke R is £19,099 — about 78% more in real terms. The bike has moved from quirky single-cylinder Duke to flagship hyper-naked premium product. Worth every penny if you want the most aggressive litre-class naked on sale.
Weight gain
+48kg
152kg dry 620 Duke → 200kg wet 1390 Super Duke R. Bigger engine, more electronics, full ABS hardware, larger fuel tank, fully adjustable WP suspension. Modern Super Duke is much heavier than the original Duke but still lighter than its rivals.
Variable Valve Timing
Industry first (V-twin)
The 1390 (2024) introduced KTM CamShift VVT system on a V-twin — only Aprilia and Ducati had used VVT on V-twins before. Variable cam timing means useable bottom-end AND superbike top-end power. The reason the 1390 makes 17bhp more than the 1290 from only 49cc more.
Rider aids count
0 → 10
1996: nothing. 2026: cornering ABS Pro (Bosch MSC), traction control, slide control, wheelie control, ride modes (5 inc Track), quickshifter, IMU electronics, smartphone connectivity, hill control, launch control. KTM electronics suite is class-leading.
Cheapest way in
£3.5k
A clean 990 Super Duke from 2005-2008. The bike that invented the modern hyper-naked. Trellis frame, V-twin character, aggressive geometry, no electronics to break. Every Super Duke since owes everything to the 990.
