Positioned in Aprilia's super motard motorcycle lineup, the 2020 Aprilia SX 125 relies on a 124.2 cc (7.6 cu in) liquid-cooled single cylinder, four-stroke powerplant. In factory specification, peak output is rated at 15 HP (10.9 kW) at 10,500 rpm while maximum torque reaches 11.2 Nm (8.3 lb-ft) at 8,000 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 120.8 HP per liter and a 2,500 rpm working window between peak torque (8,000 rpm) and peak power (10,500 rpm), 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 SX 125 measures 134 kg (295 lbs) wet (curb), translating to a power-to-weight ratio of 0.11 HP/kg (8.93 kg per horsepower). Rider ergonomics and chassis geometry center around a 880 mm (34.6 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,350 mm (53.1 in) wheelbase engineered for quick, flickable steering geometry. The 10-liter (2.6 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Aprilia archive, this model family spans 14 indexed model years from 2008 to 2025, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
120.8 HP/L
Power-to-Weight
0.11 HP/kg (8.93 kg/HP)
Power Band Window
8,000–10,500 rpm
Standover Height
880 mm (34.6 in)
Engine
Displacement124.2 ccm (7.58 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power15.0 HP (10.9 kW)) @ 10500 RPM
Torque11.2 Nm (1.1 kgf-m or 8.3 ft.lbs) @ 8000 RPM
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.
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.
