Positioned in Aprilia's enduro - offroad motorcycle lineup, the 2023 Aprilia RX 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 10,000 rpm while maximum torque reaches 10.9 Nm (8 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 2,000 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 RX 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 905 mm (35.6 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,425 mm (56.1 in) wheelbase engineered for balanced agility and highway composure. The 7-liter (1.8 US gal) fuel tank paired with a rated consumption of 2.6 L/100 km provides an estimated theoretical range of roughly 269 km (167 miles) between fill-ups.
Within MotoLibrary's Aprilia archive, this model family spans 17 indexed model years from 1984 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
8,000–10,000 rpm
Theoretical Range
~269 km (167 mi)
Engine
Displacement124.2 ccm (7.58 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power15.0 HP (10.9 kW)) @ 10000 RPM
Torque10.9 Nm (1.1 kgf-m or 8.0 ft.lbs) @ 8000 RPM
Compression12.6:1
Bore x Stroke58.0 x 47.0 mm (2.3 x 1.9 inches)
Valves/Cylinder4
Fuel SystemInjection
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)
ClutchMulti-plate in oil bath.
DrivelinePrimary drive: Gearbox: 63/19 (3.31). Final drive: Chain: 17/40 (2.35).
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 TypeTwin-tube, steel
Front SuspensionØ 41 mm telescopic upside down fork
Front Travel240 mm (9.4 inches)
Rear SuspensionSteel swingarm, monoshock with progressive link system
Rear Travel210 mm (8.3 inches)
Wheelbase1425 mm (56.1 inches)
Wheels & Brakes
Front Tyre90/90-21
Rear Tyre120/80-18
Front BrakesSingle disc. Floating calliper. Front wheel only ABS.
Front Brake Ø260 mm (10.2 inches)
Rear BrakesSingle disc. Floating calliper
Rear Brake Ø220 mm (8.7 inches)
WheelsAluminium spoked wheel.
Dimensions & Weight
Dry Weight124.0 kg (273.4 pounds)
Weight incl.134.0 kg (295.4 pounds)
Power/Weight0.1210 HP/kg
Seat Height905 mm (35.6 inches) If adjustable, lowest setting.
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.
