Positioned in Ktm's enduro - offroad motorcycle lineup, the 2021 Ktm 125 XC pairs a 124.8 cc (7.6 cu in) liquid-cooled single cylinder, two-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 15 HP (10.9 kW), transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 120.2 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 XC measures 89 kg (196 lbs) dry, translating to a power-to-weight ratio of 0.17 HP/kg (5.93 kg per horsepower). Rider ergonomics and chassis geometry center around a 850 mm (33.5 in) seat height — resulting in a taller command-style riding posture suited to medium-to-tall inseams. The 7.5-liter (2 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Ktm archive, this model family spans 4 indexed model years from 2021 to 2025, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
120.2 HP/L
Power-to-Weight
0.17 HP/kg (5.93 kg/HP)
Standover Height
850 mm (33.5 in)
Engine
Displacement124.8 ccm (7.62 cubic inches)
Engine TypeSingle cylinder, two-stroke
Power15.0 HP (10.9 kW))
Bore x Stroke54.0 x 54.5 mm (2.1 x 2.1 inches)
Fuel SystemInjection
IgnitionKokusan EMS
LubricationWet sump
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchMulti-plate clutch, Brembo hydraulics
Driveline5/8 x 1/4 (520) O Ring. Primary drive: 22:72.
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.
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.
