Buell / EBR Buell XR9R Firebolt (2007) vs Aprilia RS 660 Extrema (2023)
Comparison technical specifications
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| Make: | Buell / EBR | Aprilia |
| Model: | Buell XR9R Firebolt | RS 660 Extrema |
| Years: | 2007 | 2023 |
| Engine: | 45° V-Twin, four stroke, pushrod actuated overhead valve. hydraulic self-adjusting lifters, 2 valve per cylinder. | Four stroke, forward facing parallel twin, DOHC with silent chain drive on the right side, four valves per cylinder |
| Capacity: | 984 cc / 60 cu in | 659 cc / 40.2 cu-in |
| Bore x Stroke: | 88.9 x 79.4 mm | 81 x 63.93 mm |
| Compression Ratio: | 10.0:1 | 13.5: 1 |
| Cooling System: | Air cooled | Liquid cooled with radiator and water-oil heat exchanger |
| Lubrication: | Dry sump | Wet sump |
| Exhaust: | Tuned tri-pass resonance chamber | Street-legal exhaust system by SC Project |
| Induction: | DDFI fuel injection, Ø45 mm downdraft | Airbox with front air intake. 2 ∅48 mm throttle bodies, Ride-By-Wire management |
| Starting: | Electric | Electric |
| Max Power: | 67.1 kW / 92 hp @ 7500 rpm | 100 hp / 73.5 kW @ 10500 rpm |
| Max Torque: | 97 Nm / 9.9 kgf-m / 71.5 ft.lbs @ 5500 rpm | 67.0 Nm / 6.83 kgm @ 8500 rpm |
| Clutch: | Wet, multi-plate | Wet, multi-plate, slipper |
| Transmission: | 5 Speed | 6 Speed, AQS Aprilia Quick Shift |
| Final Drive: | Kevlar belt | Chain, with drive ratio: 17/43 |
| Frame: | Hollow aluminium twin-spar frame doubles as the fuel tank | Double beam aluminium frame with detachable rear seat |
| Rake: | 21° | 24.1° |
| Trail: | 84 mm / 3.3" | 104.6 mm |
| Front Suspension: | Showa upside-down forks, adjustable for preload, compression & rebound damping | Kayaba upside down fork ∅ 41 mm with counter spring, aluminium feet for fixing radial calipers. Adjustable for rebound, compression and spring preload. |
| Front Wheel Travel: | 119 mm / 4.7" | 120 mm / 4.7 in |
| Rear Suspension: | Showa shock absorber, adjustable for preload, compression & rebound damping | Aluminium swingarm with asymmetrical trusses. Monoshock with adjustable counter spring: rebound and spring preload. |
| Rear Wheel Travel: | 127 mm / 5.0" | 130 mm / 5.1 in |
| Front Brakes: | ZTL-type brake, 6-piston fixed caliper, Ø375 mm single sided, inside out, stainless steel, floating rotor | 2x 320mm Brembo radial calipers with 4 32mm opposing pistons. Radial pump and metal braided brake hose |
| Rear Brakes: | Single Ø230 mm disc, 1 piston caliper | Single 220mm disc; Brembo calliper with 2 isolated ∅ 34mm pistons. Pump with integrated tank and metal braided hos |
| Front Wheel: | 3.50 x 17" | In aluminium alloy 3.5 x17 |
| Rear Wheel: | 5.50 x 17" | In aluminium alloy 5.5 x17 |
| Front Tyre: | 120/70 ZR17 Pirelli Diablo T | 120/70 ZR 17 Tubeless radials |
| Rear Tyre: | 180/55 ZR17 Pirelli Diablo T | 180/55 ZR 17 (alternatively 180/60 ZR17) Tubeless radials |
| Wheelbase: | 1320 mm / 52" | 1370 mm / 53.9 in |
| Seat Height: | 775 mm / 30.5" | 815 mm / 32.0 in |
| Fuel Capacity: | 14 L / 3.7 US gal | 15 Litres / 3.9 US gal |