Engineered by Aprilia for the sport motorcycle segment, the 2025 Aprilia RS 660 relies on a 659 cc (40.2 cu in) liquid-cooled twin, four-stroke powerplant. In factory specification, peak output is rated at 100 HP (73 kW) at 10,500 rpm while maximum torque reaches 67 Nm (49.4 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 151.7 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 measures 183 kg (403 lbs) wet (curb), translating to a power-to-weight ratio of 0.55 HP/kg (1.83 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 1,370 mm (53.9 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).
Within MotoLibrary's Aprilia archive, this model family spans 5 indexed model years from 2021 to 2025, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
151.7 HP/L
Power-to-Weight
0.55 HP/kg (1.83 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
Engine DetailsForward facing cylinders
Power100.0 HP (73.0 kW)) @ 10500 RPM
Torque67.0 Nm (6.8 kgf-m or 49.4 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)
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchMulti-plate wet clutch with mechanical slip system
DrivelineDrive ratio: 17/43
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
Chassis
Frame TypeAluminium dual beam chassis with removable seat support subframe
Rake24.1°
Trail104 mm (4.1 inches)
Front SuspensionKayaba 41-mm stanchion fork, aluminium radial calliper mounting bracket. Adjustable spring preload and rebound damping.
Front Travel120 mm (4.7 inches)
Rear SuspensionAluminium asymmetric swingarm. Adjustable monoshock in spring reload, rebound braking
Rear Travel130 mm (5.1 inches)
Wheelbase1370 mm (53.9 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)
Dimensions & Weight
Dry Weight169.0 kg (372.6 pounds)
Weight incl.183.0 kg (403.4 pounds)
Power/Weight0.5917 HP/kg
Seat Height820 mm (32.3 inches) If adjustable, lowest setting.
Fuel Capacity15.00 litres (3.96 US gallons)
Other
StarterElectric
Color OptionsAcid gold, Tribute purple, Racing black
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.
