Engineered by Aprilia for the sport motorcycle segment, the 2025 Aprilia RS660 features a 659 cc liquid cooled with radiator and water-oil heat exchanger-cooled engine configuration. In factory specification, peak output is rated at 100 HP while maximum torque reaches 67 Nm, transferring power to the rear wheel through a 6 speed, aprilia quick shift (aqs) system up and down (optional accessory) gearbox. With a specific output of 151.7 HP per liter, the engine character is placing it firmly in high-revving supersport territory where top-end breathing dominates.
On the scales, the RS660 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 822 mm (32.4 in) seat height — resulting in a taller command-style riding posture suited to medium-to-tall inseams. The 15-liter (4 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Specific Output
151.7 HP/L
Power-to-Weight
0.55 HP/kg (1.83 kg/HP)
Standover Height
822 mm (32.4 in)
Engine
Displacement659 cc
Power100 hp
Torque67 Nm
CoolingLiquid cooled with radiator and water-oil heat exchanger
Transmission
Gearbox6 Speed, Aprilia Quick Shift (AQS) System up and down (optional accessory)
Chassis
Front Suspension41mm KYB inverted fork, adjustable preload, rebound and compression damping
Rear SuspensionKYB monoshock, adjustable preload, rebound and compression damping
Wheels & Brakes
Front Brakes2x 320mm Brembo radial calipers with 4 horizontally opposed 32 mm pistons, radial pump and metal braided brake hose
Rear BrakesSingle 220mm disc; Brembo caliper with two 34 mm separate pistons, master cylinder with separate reservoir and metal braided hose
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.
