2025 · Supersport · Buyer's Guide
Twin-Cylinder Precision On Rails
The RS 660 builds its case around a 659 cc parallel twin making 105 hp and 52 lb-ft, wrapped in an aluminum frame that keeps wet weight at 403 lb. Enlarged throttle bodies and winglets in the fairing give it a clear sporting intent, and the APRC package behind it is serious kit: ride-by-wire with three switchable maps, slide control, cornering ABS, traction and wheelie control, launch control. This is Aprilia doing what Aprilia does well, which is making real performance usable rather than intimidating. It sits in the middleweight supersport class as a genuine rider's tool, not a styling exercise.
On the road it stays light and honest. The front end talks to you, the bike holds a line without argument, and lean clearance is enormous, so the limits you find are yours and not the chassis'. Adjustable suspension front and rear, a slipper clutch, cruise control and a TFT dash mean it works on a long weekend loop as well as a hard Sunday morning. Who it suits: riders who value precision and feedback over sheer numbers. The honest caveat is that it stays a sportbike. The 32.3 in seat, the 4.0 gal tank and the fixed screen set the terms of any long day.
Spec sheets don't ride bikes, but they set the baseline.
| Power | 105 hp (77 kW) |
|---|---|
| Torque | 52 lb-ft (70 Nm) |
| Displacement | 659 cc |
| Engine | Parallel twin |
| Cooling | Liquid-cooled |
| Gearbox | 6-speed |
| Final drive | Chain |
| Front tire | 120/70-17 |
| Rear tire | 180/55-17 |
| Seat height | 32.3 in (820 mm) |
| Wet weight | 403 lb (183 kg) |
| Fuel capacity | 4.0 gal (15 L) |
Equipment check
Chassis
Connectivity
Drivetrain
Lighting
Safety
The first thing you notice is the noise. The 270-degree crank gives it that uneven, hard-edged bark that sounds far angrier than the displacement suggests, and it carries through the mirrors as a fine, warm buzz rather than a numbing one. The riding position is sporty without being punishing. Your wrists take weight but the bars sit high enough that town speeds don't hurt, and at 403 lb the bike feels smaller between your knees than the numbers read. Ground clearance is so generous that your boots run out of nerve long before anything touches down. At an honest road pace it settles into a calm, planted rhythm on the freeway, the fairing and winglets keeping the airstream off your chest, and the TFT stays readable in hard California sun. You get off it fresher than you expect.
EU REACH-compliance recall for left handlebar grip
The rubber used in the left handlebar grip does not comply with EU REACH regulations, prompting a free replacement campaign. The issue is not safety-critical but a precautionary measure.
Where this Aprilia RS 660 pulls ahead of — or falls behind — its rivals on the numbers, and the typical bike in its class on character.
Power
Torque
Displacement
Wet weight
Seat height
Forget spec-sheet bragging. Here's who the RS 660 is actually built for.
For Angeles Crest and the Malibu roads this is close to ideal. Light steering, real front-end feel and lean angle you cannot use up, plus enough electronics to keep a fast pace safe.
Made for Angeles Crest Highway · Coronado Trail / US 191 · Highway 1 / Big Sur
On the Dragon and Cherohala the RS 660 rewards technique over horsepower. It holds a tight line, gives you clear feedback, and 105 hp is plenty for roads that never open up.
Made for Back of the Dragon · Blue Ridge Parkway · Cherohala Skyway
Great on the Twisted Sisters, less great on the long haul to get there. Cruise control and stability help, but plan your day around the 4.0 gal tank and a sportbike seat.
Made for Austin / Texas Hill Country · Twisted Sisters · Austin / Handbuilt Motorcycle Show
If you're cross-shopping the older generation, here's what changed.
Previous generation · 2020–2024
Middleweight With Genuine Bite
Compare to the previous model →If this one isn't quite the fit, these are the bikes worth riding back-to-back against it.
Any price note compares both bikes at the same age — the youngest age both have on the used market — against this Aprilia RS 660. “cheaper/pricier” is what that bike costs second-hand, not how worn it is.
