| General |
| Year | 2021 | 2020 |
| Make Model | Aprilia RS 660 | KTM 790 Duke |
| Dimensions |
| Seat Height | 815 mm / 32.0 in | 825 mm / 32.4 in |
| Wheelbase | 1370 mm / 53.9 in | 1475 ± 15 mm / 58 in |
| Ground Clearance | - | 186 mm / 7.3 in |
| Height | - | 1059 mm / 41.7 in |
| Length | - | 2062 mm / 81.2 in |
| Width | - | 904 mm / 35.6 in |
| Weights & Capacities |
| Dry Weight | 169 kg / 372.5 lbs | 169 kg / 372.5 lbs |
| Fuel Capacity | 15 Litres / 3.9 US gal | 14 Litres / 3.7 US gal |
| Wet Weight | 183 kg / 403.4 lbs | - |
| Performance |
| Max Power | 100 hp / 73.5 kW @ 10,500 rpm | 78 kW / 105 hp @ 9000 rpm |
| Max Torque | 67.0 Nm / 6.83 kgm @ 8,500 rpm | 87 Nm / 63.4 lb-ft @ 8,000 rpm |
| Engine |
| Displacement | 659 cc / 40.2 cu-in | 799 cc / 48.7 cu-in |
| Engine Detail | Four stroke, forward facing parallel twin, DOHC with silent chain drive on the right side, four valves per cylinder | Four stroke, parallel twin cylinder, DOHC, 4 valve per cylinder |
| Bore x Stroke | 81 x 63.93 mm | 88 mm x 65.7 mm |
| Compression Ratio | 13.5: 1 | 12.7:1 |
| Cooling System | Liquid cooled with radiator and water-oil heat exchanger | Liquid cooled |
| Emissions | Euro 5 CO2 emissions - 116 g /km | - |
| Exhaust | Akrapovič - for race use only | Stainless steel primary and secondary silencer |
| Fuel Induction | Airbox with front air intake. 2 ∅48 mm throttle bodies, Ride-By-Wire management | Dell'Orto fuel-Injection |
| Ignition | - | Bosch EMS with RBW |
| Lubrication | Wet sump | Forced oil lubrication with 2 oil pumps |
| Starter | Electric | Electric |
| Drivetrain |
| Clutch | Wet, multi-plate, slipper | PASC antihopping clutch, mechanically operated |
| Final Drive | Chain, with drive ratio: 17/43 | Chain 520 X-Ring |
| Primary Drive | - | 39:75 |
| Secondary Drive Ratio | - | 16:41 |
| Transmission / Drive | 6 Speed, AQS Aprilia Quick Shift | 6 Speed |
| Chassis |
| Frame Type | Double beam aluminium frame with detachable rear seat | Chromium-Molybdenum-Steel frame using the engine as stressed element, powder coated |
| Suspension - Front | Kayaba upside down fork ∅ 41 mm with counter spring, aluminium feet for fixing radial calipers. Adjustable for rebound, compression and spring preload. | 43mm WP upside-down |
| Suspension - Rear | Aluminium swingarm with asymmetrical trusses. Monoshock with adjustable counter spring: rebound and spring preload. | WP shock absorber with preload adjuster |
| Rake | 24.1° | 24° |
| Steering Head Angle | - | 66° |
| Trail | 104.6 mm | 98 mm / 3.8 in |
| Wheel Travel - Front | 120 mm / 4.7 in | 140 mm / 5.5 in |
| Wheel Travel - Rear | 130 mm / 5.1 in | 150 mm / 5.9 in |
| Electronics |
| 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) | - |
| Wheels & Brakes |
| Brakes - Front | 2x 320mm Brembo radial calipers with 4 32mm opposing pistons. Radial pump and metal braided brake hose | 2x 300mm discs |
| Brakes - Rear | Single 220mm disc; Brembo calliper with 2 isolated ∅ 34mm pistons. Pump with integrated tank and metal braided hos | Single 240mm disc |
| ABS | ABS Cornering multimap | Bosch 9MP two-channel ABS (incl. Supermoto mode, diesengageable) |
| Tyres - Front | 120/70 ZR 17 Tubeless radials | 120/70-17 |
| Tyres - Rear | 180/55 ZR 17 (alternatively 180/60 ZR17) Tubeless radials | 180/55-17 |
| Wheels | - | Cast aluminium |
| Wheels - Front | In aluminium alloy 3.5 x17 | 3.50 x 17 in |
| Wheels - Rear | In aluminium alloy 5.5 x17 | 5.50 x 17 in |