Engineered by Aprilia for the sport motorcycle segment, the 2025 Aprilia RS 660 35kW pairs a 659 cc (40.2 cu in) liquid-cooled twin, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 46.9 HP (34.3 kW), transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 71.2 HP per liter, the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the RS 660 35kW measures 183 kg (403 lbs) wet (curb), translating to a power-to-weight ratio of 0.26 HP/kg (3.9 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 4.9 L/100 km provides an estimated theoretical range of roughly 306 km (190 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
71.2 HP/L
Power-to-Weight
0.26 HP/kg (3.9 kg/HP)
Theoretical Range
~306 km (190 mi)
Engine
Displacement659.0 ccm (40.21 cubic inches)
Engine TypeTwin, four-stroke
Power46.9 HP (34.3 kW))
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)
IgnitionEletric
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 Consumption4.90 litres/100 km (20.4 km/l or 48.00 mpg)
Greenhouse Gases113.7 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)
WheelsPirelli Diablo Rosso Corsa tires
Dimensions & Weight
Dry Weight169.0 kg (372.6 pounds)
Weight incl.183.0 kg (403.4 pounds)
Power/Weight0.2778 HP/kg
Seat Height820 mm (32.3 inches) If adjustable, lowest setting.
Overall Height1150 mm (45.3 inches)
Overall Length1995 mm (78.5 inches)
Overall Width745 mm (29.3 inches)
Fuel Capacity15.00 litres (3.96 US gallons)
Other
StarterElectric
Color OptionsAcid Gold, Racing Black, Tribute Purple
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.
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.
