Aprilia RS 660 Extrema (2023) vs Honda CB 450 (1971-72)
Comparison technical specifications
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| Make: | Aprilia | Honda |
| Model: | RS 660 Extrema | CB 450 |
| Years: | 2023 | 1971-72 |
| Engine: | 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, 2 valves per cylinder |
| Capacity: | 659 cc / 40.2 cu-in | 445 cc / 27.1 cu-in |
| Bore x Stroke: | 81 x 63.93 mm | 70 x 57.8 mm |
| Compression Ratio: | 13.5: 1 | 9.0:1 |
| Cooling System: | Liquid cooled with radiator and water-oil heat exchanger | Air cooled |
| Induction: | Airbox with front air intake. 2 ∅48 mm throttle bodies, Ride-By-Wire management | 2x 32mm Keihin carburetors |
| Starting: | Electric | Kick |
| Max Power: | 100 hp / 73.5 kW @ 10500 rpm | 45 hp / 32.8 kW @ 9000 rpm |
| Max Torque: | 67.0 Nm / 6.83 kgm @ 8500 rpm | 37.4 Nm / 27.6 lb-ft @ 7000 rpm |
| Transmission: | 6 Speed, AQS Aprilia Quick Shift | 5 Speed |
| Final Drive: | Chain, with drive ratio: 17/43 | Chain |
| Frame: | Double beam aluminium frame with detachable rear seat | Tubular semi-duplex cradle with single front down-tube |
| Front Suspension: | Kayaba upside down fork ∅ 41 mm with counter spring, aluminium feet for fixing radial calipers. Adjustable for rebound, compression and spring preload. | Telescopic forks with two-way damping. |
| Rear Suspension: | Aluminium swingarm with asymmetrical trusses. Monoshock with adjustable counter spring: rebound and spring preload. | Swing arm, shock absorbers with adjustable preload |
| Front Brakes: | 2x 320mm Brembo radial calipers with 4 32mm opposing pistons. Radial pump and metal braided brake hose | Single disc |
| Rear Brakes: | Single 220mm disc; Brembo calliper with 2 isolated ∅ 34mm pistons. Pump with integrated tank and metal braided hos | Drum |
| Front Tyre: | 120/70 ZR 17 Tubeless radials | 3.25-19 |
| Rear Tyre: | 180/55 ZR 17 (alternatively 180/60 ZR17) Tubeless radials | 3.50-18 |
| Wheelbase: | 1370 mm / 53.9 in | 1300 mm / 53 in |
| Wet Weight: | 166 kg / 366 lbs | 204.0 kg / 449.7 lbs |
| Fuel Capacity: | 15 Litres / 3.9 US gal | 14 Litres / 3.7 US gal |