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2021 Aprilia RS 660 Overview
For 2021, Aprilia offers the RS 660 as a sport motorcycle with 659 cc on tap. The 2021 Aprilia RS 660 is built around a Four stroke, forward facing parallel twin, DOHC with silent chain drive on the right side, four valves per cylinder engine, a compression ratio of 13.5: 1. Out on the road, the RS 660 delivers 100 hp @ 10,500 rpm of peak power and 67 Nm @ 8,500 rpm of torque. In everyday use, the 2021 RS 660 tips the scales at 183 kg, carries a 15-litre fuel tank, offers a seat height of 815 mm and spans a 1370 mm wheelbase. That's roughly 11.8 kg lighter than the average sport motorcycle in our database. Every technical detail, from suspension travel to tyre sizes, is covered in the full 2021 Aprilia RS 660 spec sheet below.
2021 Aprilia RS 660 compared with other bikes in the Sport category
Measured against other bikes in the Sport category in our database (up to 1607 models, one entry per model), the 2021 Aprilia RS 660 comes out as follows.
- With 183 kg, the RS 660 has the joint 370th lightest wet weight of 1213 bikes in the Sport category, 6% below the category average of 194.8 kg.
- Seat height of 815 mm is taller than that of 979 of the other 1606 bikes in the Sport category.
- Narrowing the field to the 461 models within five model years of it, the wet weight of 183 kg is lighter than that of 325 of the other 460.
Versus the 2020 model
The figures we track are unchanged from the 2020 model: peak power, peak torque, wet weight, displacement and seat height all match.
2021 RS 660 - Pros & Cons
Strengths
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⚡
Strong power output: Peak output on the RS 660 is 100 hp @ 10,500 rpm and 67 Nm @ 8,500 rpm of torque - strong numbers for what it is.
Considerations
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⚙️
Chain final drive upkeep: A chain drivetrain is the most common setup in its class, but it's also the one that demands the most regular hands-on maintenance.
Wear Points & Servicing Notes
Cooling system servicing
With Liquid cooled with radiator and water-oil heat exchanger, thermal management is largely automatic, but the coolant has a service life of its own - replace it on the manufacturer's interval to protect the water passages and thermostat.
Suspension condition on used examples
Suspension duties are handled by Kayaba upside down fork ∅ 41 mm with counter spring, aluminium feet for fixing radial calipers. Adjustable for rebound, compression and spring preload up front and Aluminium swingarm with asymmetrical trusses. Monoshock with adjustable counter spring: rebound and spring preload at the rear. Weeping fork seals aren't a dealbreaker on a used bike, but they're a fair basis for negotiating price.
Final drive maintenance
Chain final drive on the RS 660 means routine lubing and tension checks are part of ownership - skip them and sprocket wear accelerates noticeably.
Frame & chassis check
The Double beam aluminium frame with detachable rear seat chassis holds up well with normal use; on a used bike it's still worth checking the head-stock and swingarm pivot area for impact damage or corrosion.
RS 660 - Buying & Maintenance Guide
What to check before buying
A pre-purchase check on the 2021 Aprilia RS 660 with its 659 cc sport should cover the same ground every time: service history, drivetrain condition, and any oil seepage around the casings. This model runs chain final drive, so check chain slack and sprocket tooth profile specifically - a worn sprocket is a cheaper fix now than after it's chewed up the next chain. Now 5 years old, this sport is as likely to show age-related wear (perished rubber, seized fasteners, degraded seals) as mileage-related wear. Start it from cold if you can - a well-kept RS 660 settles to a smooth idle within seconds.
Oil and filter changes
Oil changes are the cheapest insurance you can buy for the RS 660's 659 cc four stroke, forward facing parallel twin, dohc with silent chain drive on the right side, four valves per cylinder - keep to the manufacturer's interval rather than stretching it. With a 13.5: 1 compression ratio, running the octane grade specified in the manual matters more than on a lower-compression engine. Use the viscosity grade the manual specifies, not whatever's on sale.
Carburetor upkeep
An RS 660 that's sat unused is almost always a carb-cleaning job before it runs right again - float bowls and pilot jets first, since they clog before anything else.
2021 Aprilia RS 660 - Frequently Asked Questions
What engine does the 2021 Aprilia RS 660 have?
The 2021 Aprilia RS 660 uses a Four stroke, forward facing parallel twin, DOHC with silent chain drive on the right side, four valves per cylinder engine with 659 cc of displacement. It is liquid cooled with radiator and water-oil heat exchanger.
How much does the 2021 Aprilia RS 660 weigh?
The 2021 Aprilia RS 660 weighs 183 kg. This is the manufacturer's wet figure.
How much power does the 2021 Aprilia RS 660 make?
The 2021 Aprilia RS 660 produces 100 hp @ 10,500 rpm of power and 67 Nm @ 8,500 rpm of torque. These are peak figures.
What is the fuel tank capacity of the 2021 Aprilia RS 660?
The 2021 Aprilia RS 660 has a 15-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 250-300 km between stops.
Is the 2021 Aprilia RS 660 suitable for shorter riders?
The 2021 Aprilia RS 660 has a seat height of 815 mm. This is a moderate seat height that suits a wide range of rider heights.
What brakes does the 2021 Aprilia RS 660 have?
The 2021 Aprilia RS 660 uses 2x 320mm Brembo radial calipers with 4 32mm opposing pistons with radial pump and metal braided brake hose at the front and single 220mm disc; Brembo calliper with 2 isolated ∅ 34mm pistons with Pump with integrated tank and metal braided hos at the rear.
What tyre sizes does the 2021 Aprilia RS 660 use?
The 2021 Aprilia RS 660 runs 120/70 ZR 17 Tubeless radials front and 180/55 ZR 17 rear tyres. A good selection of sport, touring and all-weather rubber is available in these sizes.
What gearbox does the 2021 Aprilia RS 660 have?
The 2021 Aprilia RS 660 is fitted with a 6 Speed, AQS Aprilia Quick Shift transmission.
Aprilia RS 660 Spec Evolution
The Aprilia RS 660 was produced across 2 model years (2020-2021). The table below highlights the key specifications that changed across the production run - useful whether you are comparing years or tracking down a specific variant.
| Specification |
2020 |
2021 |
| Engine Detail |
Four stroke, Forward facing parallel twin, DOHC with silent chain drive on the right side, four valves per cylinder. |
Four stroke, forward facing parallel twin, DOHC with silent chain drive on the right side, four valves per cylinder |
| Fuel Capacity |
15 Litres / 3.9 US gal |
15 Liters / 3.9 gal |
| Electronics Package |
6-axis inertial platform, APRC suite which includes ATC (traction control, AWC (wheelie control), AEB (engine brake), AEM (engine map), ACC (cruise control) 5 Riding modes - (Road and Track, 3 fixed and 2 customizable) |
6-axis inertial platform, APRC suite which includes ATC (traction control, AWC (wheelie control), AEB (engine brake), AEM (engine map), ACC (cruise control) 5 Riding modes - (Road and Track, 3 fixed and 2 customizable) |
| Final Drive |
Chain |
Chain, with drive ratio: 17/43 |
| Tyres - Front |
120/70 ZR 17 Tubeless radials |
120/70 ZR 17 |
| Tyres - Rear |
180/55 ZR 17 (alternatively 180/60 ZR17) Tubeless radials |
180/55 ZR 17 |
| Rake |
24.1.0° |
24.1° |
| Fuel Induction |
Airbox with front air intake. 2 ∅48 mm throttle bodies, Ride-By-Wire management |
Electronic fuel injection, Ride-by-Wire, 2 × Ø48 mm throttle bodies |
Key Specifications
Engine
Four stroke, forward facing parallel twin, DOHC with silent chain drive on the right side, four valves per cylinder
Power
100 hp / 73.5 kW @ 10,500 rpm
Torque
67.0 Nm / 6.83 kgm @ 8,500 rpm
Weight
183 kg / 403.4 lbs
Fuel Capacity
15 Liters / 3.9 gal
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Full 2021 Aprilia RS 660 Specifications
Year
2021
Model
RS 660
Make Model
Aprilia RS 660
Seat Height
815 mm / 32.0 in
Wheelbase
1370 mm / 53.9 in
Wheelbase
1370 mm / 53.9 in
Height
1150 mm / 45.3 in
Length
1995 mm / 78.5 in
Width
745 mm / 29.3 in
Dry Weight
169 kg / 372.5 lbs
Dry Weight
169 kg / 372.5 lbs
Fuel Capacity
15 Liters / 3.9 gal
Fuel Capacity
15 Litres / 3.9 US gal
Wet Weight
183 kg / 403.4 lbs
Displacement
659 cc / 40.2 cu-in
Engine Detail
Four stroke, forward facing parallel twin, DOHC with silent chain drive on the right side, four valves per cylinder
Bore x Stroke
81 x 63.93 mm
Compression Ratio
13.5: 1
Cooling System
Liquid cooled with radiator and water-oil heat exchanger
Emissions
Euro 5 CO2 emissions - 116 g /km
Exhaust
Akrapovič - for race use only
Fuel Induction
Airbox with front air intake. 2 ∅48 mm throttle bodies, Ride-By-Wire management
Fuel Induction
Electronic fuel injection, Ride-by-Wire, 2 × Ø48 mm throttle bodies
Lubrication
Wet sump
Lubrication System
Wet sump
Starter
Electric
Clutch
Wet, multi-plate, slipper
Final Drive
Chain, with drive ratio: 17/43
Final Drive Ratio
17/43
Transmission / Drive
6 Speed, AQS Aprilia Quick Shift
Frame Type
Double beam aluminium frame with detachable rear seat
Suspension - Front
Kayaba upside down fork ∅ 41 mm with counter spring, aluminium feet for fixing radial calipers. Adjustable for rebound, compression and spring preload.
Suspension - Rear
Aluminium swingarm with asymmetrical trusses. Monoshock with adjustable counter spring: rebound and spring preload.
Rake
24.1°
Rake
24.1°
Trail
104.6 mm / 4.1 in
Trail
104.6 mm
Wheel Travel - Front
120 mm / 4.7 in
Wheel Travel - Rear
130 mm / 5.1 in
Electronics Package
6-axis inertial platform, APRC suite which includes ATC (traction control, AWC (wheelie control), AEB (engine brake), AEM (engine map), ACC (cruise control) 5 Riding modes - (Road and Track, 3 fixed and 2 customizable)
Brakes - Front
2x 320mm Brembo radial calipers with 4 32mm opposing pistons. Radial pump and metal braided brake hose
Brakes - Rear
Single 220mm disc; Brembo calliper with 2 isolated ∅ 34mm pistons. Pump with integrated tank and metal braided hos
ABS
ABS Cornering multimap
Tyres - Front
120/70 ZR 17 Tubeless radials
Tyres - Front
120/70 ZR 17
Tyres - Rear
180/55 ZR 17
Tyres - Rear
180/55 ZR 17 (alternatively 180/60 ZR17) Tubeless radials
Wheels - Front
In aluminium alloy 3.5 x17
Wheels - Rear
In aluminium alloy 5.5 x17
Specifications are compiled from manufacturer documentation and cross-referenced
technical sources, and corrected on an ongoing basis.
Spot an error? Let us know.
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