2026 Kawasaki Ninja 650 vs 2026 Aprilia RS 660 35KW - Spec Comparison
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2026 Kawasaki Ninja 650
The 2026 Kawasaki Ninja 650 is an accessible middleweight sportbike designed for new and returning riders seeking manageable performance with genuine style. Its 649cc parallel-twin engine delivers smooth, linear power and excellent fuel efficiency, while the comfortable 31.1-inch seat height and nimble handling make it perfect for daily commuting and weekend canyon carving alike.
2026 Aprilia RS 660 35KW
The Aprilia RS 660 35kW is a lightweight middleweight sport bike engineered for riders seeking responsive handling and accessible performance. Its compact 659cc twin-cylinder engine delivers smooth power without overwhelming newer or smaller-framed riders, while its agile chassis and 235 km/h top speed make it ideal for both track days and spirited road riding. Known for its refined Italian engineering and friendly character, the RS 660 bridges the gap between learner bikes and full-power supersports.
2026 Kawasaki Ninja 650 vs 2026 Aprilia RS 660 35KW: the key differences
Both are sport bikes, so this is a like-for-like choice.
- The 2026 Kawasaki Ninja 650 makes 20.1 hp more (67 vs 46.9 hp).
- The 2026 Aprilia RS 660 35KW is 10 kg lighter (183 vs 193 kg).
- The 2026 Kawasaki Ninja 650 has a 30 mm lower seat (790 vs 820 mm), which helps shorter riders.
2026 Kawasaki Ninja 650: Built for spirited road riding and the occasional track day, trading some comfort for sharper performance and handling.
2026 Aprilia RS 660 35KW: It's built primarily for spirited cornering and sporty road riding rather than outright top-end speed, thanks to the detuned 46.9 HP twin in a lightweight chassis.
Verdict: Choose the 2026 Kawasaki Ninja 650 if you want more power and a lower seat. Choose the 2026 Aprilia RS 660 35KW if you want lighter weight. Check the full table below for every figure, and the size comparison for fit.
| Specification | 2026 Kawasaki Ninja 650 | 2026 Aprilia RS 660 35KW |
|---|---|---|
| Other | ||
| Category | Sport | Sport |
| Fuel Tank Material | Metal | - |
| Color Options | - | Acid Gold, Racing Black, Tribute Purple |
| Comments | - | Six-axis inertial platform, APRC package containing ATC (traction control), AWC (wheelie control), AEB (engine braking), AEM (engine maps) and ACC (cruise control). |
| Engine | ||
| Capacity: | 649.0 ccm (39.60 cubic inches) | 659.0 ccm (40.21 cubic inches) |
| CO2 Emissions | 119 CO2 g/km | - |
| EPA Certificate No. | TKAXC.649AAH-011-R02 | - |
| EPA Est. Fuel Consumption | 5.07 L/100km (46.4 US mpg) | - |
| EPA CO Emissions | 1.3 CO g/km | - |
| Engine Type | Parallel Twin, four-stroke | Parallel Twin, four-stroke |
| Bore x Stroke | 83.0 x 60.0 mm (3.3 x 2.4 inches) | 81.0 x 63.9 mm (3.2 x 2.5 inches) |
| Compression | 10.8:1 | 13.5:1 |
| Cooling System | Liquid | Liquid |
| Fuel System | Injection | Injection |
| Starting | Electric | Electric |
| Ignition | TCBI with Electronic Advance | Eletric |
| Aspiration | Naturally aspirated | - |
| Valves Per Cylinder | 4 | 4 |
| Lubrication System | Forced lubrication, semi-dry sump | - |
| Fuel Consumption | - | 4.90 litres/100 km (20.4 km/l or 48.00 mpg) |
| Performance | ||
| Power | ✓67.0 HP (49.5 kW) @ 8000 RPM | 46.9 HP (34.3 kW) @ 6000 RPM |
| Torque | 65.8 Nm (6.7 kgf-m or 48.5 ft.lbs) @ 6700 RPM | ✓67.0 Nm (6.8 kgf-m or 49.4 ft.lbs) @ 8500 RPM |
| Power/Weight Ratio | 0.3764 HP/kg (dry) | 0.2775 HP/kg (dry) |
| Top Speed | - | 235.0 km/h (146.0 mph) |
| Chassis & suspension | ||
| Frame | Trellis, high-tensile steel | Aluminium dual beam chassis with removable seat support subframe |
| Front Suspension | 41mm hydraulic telescopic fork | Kayaba 41-mm stanchion fork, aluminium radial calliper mounting bracket. Adjustable spring preload and rebound damping. |
| Rear Suspension | Horizontal back-link with adjustable spring preload | Aluminium asymmetric swingarm. Adjustable monoshock in spring reload, rebound braking |
| Front Wheel Travel | 124 mm (4.9 inches) | 120 mm (4.7 inches) |
| Rear Wheel Travel | 130 mm (5.1 inches) | 130 mm (5.1 inches) |
| Rake (fork angle) | 24.0° | 24.1° |
| Trail | 99 mm (3.9 inches) | 104 mm (4.1 inches) |
| Ground Clearance | 130 mm (5.1 inches) | - |
| Transmission | ||
| Gearbox | 6-speed | 6-speed |
| Transmission Type | Manual | Manual |
| Final Drive | Chain | Chain |
| Clutch | Wet multi-disc, manual | Multi-plate wet clutch with mechanical slip system |
| Brakes & wheels | ||
| Front Brakes | Dual 300mm petal-type discs and 2-piston calipers (and ABS) | Double disc. ABS. Brembo |
| Front Brakes Diameter | 300 mm (11.8 inches) | 320 mm (12.6 inches) |
| Rear Brakes | Single disc. Petal disc and single piston caliper. Optional ABS. | Single disc. ABS. Brembo. |
| Rear Brakes Diameter | 220 mm (8.7 inches) | - |
| ABS | Optional | Yes |
| Front Tyre | 120/70 x 17 | 120/70-ZR17 |
| Rear Tyre | 160/60 x 17 | 180/55-ZR17 |
| Dimensions & weight | ||
| Wheelbase | 1410 mm (55.5 inches) | 1370 mm (53.9 inches) |
| Overall Length | 2055 mm (80.9 inches) | 1995 mm (78.5 inches) |
| Overall Width | 739 mm (29.1 inches) | 745 mm (29.3 inches) |
| Overall Height | 1146 mm (45.1 inches) | 1150 mm (45.3 inches) |
| Seat Height | ✓790 mm (31.1 inches) | 820 mm (32.3 inches) |
| Dry weight | 178.0 kg (392.4 pounds) | ✓169.0 kg (372.6 pounds) |
| Wet Weight | 193.0 kg (425.5 pounds) | ✓183.0 kg (403.4 pounds) |
| Fuel Capacity | ✓15.10 litres (3.99 US gallons) | 15.00 litres (3.96 US gallons) |
"Best" (✓) reflects that single spec only, not overall suitability - a bike can win on paper and still be the wrong choice for you. Ties are all marked; specs with no clear better/worse direction (e.g. displacement, wheel size) are never marked, only tinted where bikes differ.
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This tool puts up to four motorcycles side by side across their full specification sheets, drawn from a database of 43,000+ models and 1.60M+ individual specifications. Wherever a spec has a clear "better" direction - more power, less weight - the strongest figure in that row is highlighted automatically.
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