At the heart of the 2025 Aprilia RS 660 Factory sport motorcycle, Aprilia relies on a 659 cc (40.2 cu in) liquid-cooled twin, four-stroke powerplant. In factory specification, peak output is rated at 105 HP (76.6 kW) at 10,500 rpm while maximum torque reaches 68 Nm (50.2 lb-ft) at 8,500 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 159.3 HP per liter and a 2,000 rpm working window between peak torque (8,500 rpm) and peak power (10,500 rpm), the engine character is placing it firmly in high-revving supersport territory where top-end breathing dominates.
On the scales, the RS 660 Factory measures 183 kg (403 lbs) wet (curb), translating to a power-to-weight ratio of 0.57 HP/kg (1.74 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 1,382 mm (54.4 in) wheelbase engineered for quick, flickable steering geometry. The 15-liter (4 US gal) fuel tank paired with a rated consumption of 4.08 L/100 km provides an estimated theoretical range of roughly 368 km (229 miles) between fill-ups, while factory top speed is listed at 235 km/h (146 mph).
Specific Output
159.3 HP/L
Power-to-Weight
0.57 HP/kg (1.74 kg/HP)
Power Band Window
8,500–10,500 rpm
Theoretical Range
~368 km (229 mi)
Engine
Displacement659.0 ccm (40.21 cubic inches)
Engine TypeTwin, four-stroke
Power105.0 HP (76.6 kW)) @ 10500 RPM
Torque68.0 Nm (6.9 kgf-m or 50.2 ft.lbs) @ 8500 RPM
Compression13.5:1
Bore x Stroke81.0 x 63.9 mm (3.2 x 2.5 inches)
Valves/Cylinder4
Fuel SystemInjection. Airbox with front dynamic air intakes, two Ø48-mm throttle bodies
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
IgnitionElectric
LubricationWet Sump
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchMulti-plate wet clutch with mechanical slip system
Performance
Top Speed235.0 km/h (146.0 mph)
Fuel Consumption4.08 litres/100 km (24.5 km/l or 57.65 mpg)
Greenhouse Gases94.7 CO2 g/km. (CO2 - Carbon dioxide emission)
Emission DetailsEuro 5
ExhaustSC-Project exhaust
Chassis
Frame TypeAluminium dual beam chassis with removable seat support subframe
Rake24.1°
Trail104 mm (4.1 inches)
Front SuspensionOhlins Inveted Fork 43
Front Travel120 mm (4.7 inches)
Rear SuspensionOhlins Twin Sided Swing Arm
Rear Travel130 mm (5.1 inches)
Wheelbase1382 mm (54.4 inches)
Wheels & Brakes
Front Tyre120/70-ZR17
Rear Tyre180/55-ZR17
Front BrakesDouble disc. ABS. Brembo
Front Brake Ø320 mm (12.6 inches)
Rear BrakesSingle disc. ABS. Brembo.
Rear Brake Ø220 mm (8.7 inches)
WheelsPirelli Diablo Rosso Corsa tires
Dimensions & Weight
Dry Weight166.0 kg (366.0 pounds)
Weight incl.183.0 kg (403.4 pounds)
Power/Weight0.6325 HP/kg
Seat Height820 mm (32.3 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.
