Positioned in Aprilia's sport motorcycle lineup, the 2025 Aprilia RS 125 pairs a 124.2 cc (7.6 cu in) liquid-cooled single cylinder, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 14.8 HP (10.8 kW) at 10,000 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 119.2 HP per liter and a 2,000 rpm working window between peak torque (8,000 rpm) and peak power (10,000 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 RS 125 measures 144 kg (317 lbs) wet (curb), translating to a power-to-weight ratio of 0.1 HP/kg (9.73 kg per horsepower). Rider ergonomics and chassis geometry center around a 820 mm (32.3 in) seat height — resulting in a taller command-style riding posture suited to medium-to-tall inseams, combined with a 1,350 mm (53.1 in) wheelbase engineered for quick, flickable steering geometry. The 14.5-liter (3.8 US gal) fuel tank paired with a rated consumption of 2.6 L/100 km provides an estimated theoretical range of roughly 558 km (347 miles) between fill-ups.
Within MotoLibrary's Aprilia archive, this model family spans 21 indexed model years from 1997 to 2025, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
119.2 HP/L
Power-to-Weight
0.1 HP/kg (9.73 kg/HP)
Power Band Window
8,000–10,000 rpm
Theoretical Range
~558 km (347 mi)
Engine
Displacement124.2 ccm (7.58 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power14.8 HP (10.8 kW)) @ 10000 RPM
Torque11.2 Nm (1.1 kgf-m or 8.3 ft.lbs) @ 8000 RPM
Compression12.6:1
Bore x Stroke58.0 x 47.0 mm (2.3 x 1.9 inches)
Valves/Cylinder4
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
IgnitionECU Electronics Magneti Marelli MIUG4 ø 32 mm
LubricationWet sump
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchMultiple discs, in oil bath
DrivelineFinal drive ratio 13/58
Performance
Fuel Consumption2.60 litres/100 km (38.5 km/l or 90.47 mpg)
Greenhouse Gases60.3 CO2 g/km. (CO2 - Carbon dioxide emission)
Emission DetailsEuro 5
Chassis
Frame TypeAluminium perimeter
Front SuspensionUpside down hydraulic fork, 40 mm.
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.
