2021 Ktm 125 Duke Technical Analysis & Specification Breakdown
Engineered by Ktm for the naked motorcycle segment, the 2021 Ktm 125 Duke pairs a 125 cc (7.6 cu in) liquid-cooled single cylinder, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 15 HP (10.9 kW) while maximum torque reaches 12 Nm (8.9 lb-ft), transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 120 HP per liter, the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.
On the scales, the 125 Duke measures 139 kg (306 lbs) dry, translating to a power-to-weight ratio of 0.11 HP/kg (9.27 kg per horsepower). Rider ergonomics and chassis geometry center around a 830 mm (32.7 in) seat height — resulting in a taller command-style riding posture suited to medium-to-tall inseams, combined with a 1,357 mm (53.4 in) wheelbase engineered for quick, flickable steering geometry. The 13.4-liter (3.5 US gal) fuel tank paired with a rated consumption of 2.42 L/100 km provides an estimated theoretical range of roughly 554 km (344 miles) between fill-ups.
Within MotoLibrary's Ktm archive, this model family spans 15 indexed model years from 2011 to 2026, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
120 HP/L
Power-to-Weight
0.11 HP/kg (9.27 kg/HP)
Theoretical Range
~554 km (344 mi)
Engine
Displacement125.0 ccm (7.63 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power15.0 HP (10.9 kW))
Torque12.0 Nm (1.2 kgf-m or 8.9 ft.lbs)
Bore x Stroke58.0 x 47.2 mm (2.3 x 1.9 inches)
Fuel SystemInjection
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
IgnitionContactless, controlled, fully electronic ignition system with digital ignition timing adjustment, type Kokusan
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Torque
Torque is useful for judging real-world pull, especially for touring, commuting and loaded riding.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
