For 2025 the RS 660 got its first major update.
| MODEL | APRILIA RS 660 / FACTORY 2025 |
| Year | 2025 |
| Engine Type | Four-stroke, forward-facing parallel twin, DOHC, 4 valves per cylinder |
| Displacement / Capacity | 659 cc / 40.2 cu in |
| Bore X Stroke | 81 x 63.93 mm |
| Compression Ratio | 13.5:1 |
| Cooling System | Liquid cooled, radiator and water-oil heat exchanger |
| Max Power | 77 kW / 105 hp @ 10500 rpm |
| Max Torque | 68 Nm / 50.2 lb-ft @ 8500 rpm |
| Ignition | — |
| Induction | Fuel injection, 2 x 52 mm throttle bodies, ride-by-wire |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | Wet sump |
| Gear Box | 6-speed, Aprilia Quick Shift (AQS) up and down |
| Clutch | Wet, multi-plate, slipper |
| Final Drive | Chain, 17/43 |
| CHASSIS SPECS | |
| Frame | Twin-spar aluminium frame |
| Front Suspension | RS 660: 41 mm Kayaba upside-down fork, rebound and preload adjustable. Factory: 43 mm Öhlins NIX 30 fork, fully adjustable. 120 mm / 4.7 in travel |
| Rear Suspension | RS 660: Kayaba monoshock, rebound and preload adjustable. Factory: Öhlins STX 46 monoshock, fully adjustable. 130 mm / 5.1 in travel |
| Front Brakes | 2 x 320 mm floating discs, Brembo radial 4-piston (32 mm) calipers, multimap ABS |
| Rear Brakes | Single 220 mm disc, Brembo 2-piston (34 mm) caliper |
| DIMENSION SPECS | |
| Overall Length | 1995 mm / 78.5 in |
| Overall Width | 745 mm / 29.3 in |
| Overall Height | 1150 mm / 45.3 in |
| Seat Height | 820 mm / 32.3 in |
| Wheelbase | 1382 mm / 54.4 in |
| Ground Clearance | — |
| Dry Weight | 169 kg / 372.6 lbs |
| Wet Weight | 183 kg / 403 lbs |
| WHEEL SPECS | |
| Front Tyre | 120/70 ZR17 |
| Rear Tyre | 180/55 ZR17 |
| FUEL SYSTEM | |
| Fuel Capacity | 15 Litres / 4.0 US gal |
| Fuel Consumption | — |
| Top Speed | — |
For 2025 the RS 660 got its first major update. Throttle bodies grew 4 mm to 52 mm and other engine changes for Euro 5+ lifted output to about 105 hp, and it gained front winglets, launch control and an extra riding mode, while the chassis stayed essentially the same. Alongside the standard bike, Aprilia now sells the RS 660 Factory, which replaces the Kayaba suspension with a fully adjustable 43 mm Öhlins NIX 30 fork and an Öhlins STX 46 shock. The two versions share the engine, brakes and the claimed 183 kg ready-to-ride weight.
