| General |
| Year | 2021 | 2025 |
| Make Model | Aprilia RS 660 | Harley Davidson Sportster S |
| Dimensions |
| Seat Height | 815 mm / 32.0 in | 765 mm / 30.1 in |
| Wheelbase | 1370 mm / 53.9 in | 1520 mm / 59.8 in |
| Ground Clearance | - | 90 mm / 3.5 in |
| Height | - | 1085 mm / 42.7 in |
| Length | - | 2270 mm / 89.42 in |
| Seat Height (Laden) | - | 734 mm / 28.9 in |
| Width | - | 840 mm / 33.1 in |
| Weights & Capacities |
| Dry Weight (kg) | 169 | 221 |
| Wet Weight (kg) | 183 | 228 |
| Dry Weight | 169 kg / 372.5 lbs | 221 kg / 487 lbs |
| Fuel Capacity | 15 Litres / 3.9 US gal | 11.7 Litres / 3.1 US gal |
| Wet Weight | 183 kg / 403.4 lbs | 228 kg / 502 lbs |
| Performance |
| Max Power | 100 hp / 73.5 kW @ 10,500 rpm | 121 hp / 90 kW @ 7500 rpm |
| Max Torque | 67.0 Nm / 6.83 kgm @ 8,500 rpm | 126 Nm / 93 lb-ft @ 6000 rpm |
| Engine |
| Displacement | 659 cc / 40.2 cu-in | 1252 cc / 76.4 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, 60° V-twin Revolution Max 1250, Chain-driven, DOHC, hydraulic self-adjusting lifters, intake & exhaust VVT, four valves per cylinder |
| Bore x Stroke | 81 x 63.93 mm | 105 x 72.3 mm |
| Compression Ratio | 13.5: 1 | 12.0:1 |
| 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 | 2-into-1-into-2, catalyst in muffler |
| Fuel Induction | Airbox with front air intake. 2 ∅48 mm throttle bodies, Ride-By-Wire management | Electronic Sequential Port Fuel Injection (ESPFI) |
| Lubrication | Wet sump | Semi-dry sump |
| Starter | Electric | Electric |
| Drivetrain |
| Clutch | Wet, multi-plate, slipper | Mechanical, 8 plate wet, assist & slip, 1090N |
| Final Drive | Chain, with drive ratio: 17/43 | Belt, 34/80 ratio |
| Gear Ratios | - | 1st 12.21 / 2nd 9.022 / 3rd 6.994 / 4th 5.641 / 5th 4.731 / 6th 4.131 |
| Primary Drive | - | Gear, 49/89 ratio |
| Transmission / Drive | 6 Speed, AQS Aprilia Quick Shift | 6 Speed |
| Chassis |
| Frame Type | Double beam aluminium frame with detachable rear seat | Stressed-member, high strength low alloy steel trellis frame; stamped, cast, and forged junctions; MIG welded; aluminum forged mid-structure |
| Suspension - Front | Kayaba upside down fork ∅ 41 mm with counter spring, aluminium feet for fixing radial calipers. Adjustable for rebound, compression and spring preload. | 43 mm inverted fork with compression, rebound and spring preload adjustability. Aluminium fork triple clamps |
| Suspension - Rear | Aluminium swingarm with asymmetrical trusses. Monoshock with adjustable counter spring: rebound and spring preload. | Linkage-mounted, piggyback monoshock with compression, rebound and hydraulic spring preload adjustability |
| Fork Angle | - | 28° |
| Lean Angle | - | 35° |
| Rake | 24.1° | 30° |
| Swingarm | - | High strength low alloy steel, tubular sections, stamped x-member, forged axle junctions; MIG welded |
| Trail | 104.6 mm | 148 mm / 5.8 in |
| Wheel Travel - Front | 120 mm / 4.7 in | 92 mm / 3.6 in |
| Wheel Travel - Rear | 130 mm / 5.1 in | 82 mm / 3.2 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 | Single 320mm rotor, radially mounted, monoblock, 4-piston caliper |
| Brakes - Rear | Single 220mm disc; Brembo calliper with 2 isolated ∅ 34mm pistons. Pump with integrated tank and metal braided hos | Single 260mm solid uniform expansion rotor, floating single piston caliper |
| ABS | ABS Cornering multimap | Standard |
| Rims - Front | - | 4.5 x 17 |
| Rims - Rear | - | 5.0 x 16 |
| Tyres - Front | 120/70 ZR 17 Tubeless radials | 160/70TR17 73V Dunlop- Harley-Davidson Series, radial, GT503 |
| Tyres - Rear | 180/55 ZR 17 (alternatively 180/60 ZR17) Tubeless radials | 180/70R16 77V Dunlop- Harley-Davidson Series, radial, GT503 |
| Wheels | - | Aluminum cast, satin black |
| Wheels - Front | In aluminium alloy 3.5 x17 | - |
| Wheels - Rear | In aluminium alloy 5.5 x17 | - |