| General |
| Year | 2021 | 2026 |
| Make Model | Aprilia RS 660 | KTM 990 RC-R |
| Dimensions |
| Seat Height | 815 mm / 32.0 in | 845 mm / 33.3 in |
| Wheelbase | 1370 mm / 53.9 in | 1481 mm / 58.3 in |
| Ground Clearance | - | 163 mm / 6.4 in |
| Weights & Capacities |
| Dry Weight (kg) | 169 | - |
| Wet Weight (kg) | 183 | 195 |
| Dry Weight | 169 kg / 372.5 lbs | - |
| Fuel Capacity | 15 Litres / 3.9 US gal | 15.7 litres / 4.1 US gal |
| Wet Weight | 183 kg / 403.4 lbs | 195 kg 430 lbs |
| Performance |
| Max Power | 100 hp / 73.5 kW @ 10,500 rpm | 128.2 hp / 94.3 kW @ 9500 rpm |
| Max Torque | 67.0 Nm / 6.83 kgm @ 8,500 rpm | 103 Nm / 75.9 lb-ft @ 6750 rpm |
| Engine |
| Displacement | 659 cc / 40.2 cu-in | 947 cc / 57.8 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 | 92.5 x 70.4 mm |
| Compression Ratio | 13.5: 1 | 13.5:1 |
| Cooling System | Liquid cooled with radiator and water-oil heat exchanger | Liquid cooled with water/oil heat exchanger |
| Emissions | Euro 5 CO2 emissions - 116 g /km | EURO 5+ |
| Engine Management | - | Bosch EMS with RBW |
| Exhaust | Akrapovič - for race use only | - |
| Fuel Induction | Airbox with front air intake. 2 ∅48 mm throttle bodies, Ride-By-Wire management | 46mm DKK Dellorto throttle body |
| Lubrication | Wet sump | Forced oil lubrication with 2 oil pumps |
| Starter | Electric | Electric |
| Drivetrain |
| Clutch | Wet, multi-plate, slipper | PASC slipper clutch, cable operated |
| Final Drive | Chain, with drive ratio: 17/43 | Chain 520 X-ring, 16:43 |
| Primary Drive | - | 42:76 |
| 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. | WP APEX 48, open cartridge, compression & rebound (30 Clicks), preload (3 clicks) |
| Suspension - Rear | Aluminium swingarm with asymmetrical trusses. Monoshock with adjustable counter spring: rebound and spring preload. | WP APEX - Monoshock, compression high-speed (3 turns) low-speed (30 clicks), rebound (30 clicks), preload (10 turns) |
| Rake | 24.1° | - |
| Trail | 104.6 mm | - |
| Wheel Travel - Front | 120 mm / 4.7 in | 147 mm / 5.8 in |
| Wheel Travel - Rear | 130 mm / 5.1 in | 134 mm / 5.3 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 | 2 x 320mm discs, radially mounted 4 piston caliper |
| Brakes - Rear | Single 220mm disc; Brembo calliper with 2 isolated ∅ 34mm pistons. Pump with integrated tank and metal braided hos | Single 240 mm disc, single piston caliper |
| ABS | ABS Cornering multimap | Standard |
| 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 |
| Wheels | - | Cast aluminium |
| Wheels - Front | In aluminium alloy 3.5 x17 | 3.5 x 17 |
| Wheels - Rear | In aluminium alloy 5.5 x17 | 5.5 x 17 |