Norton Classic Rotary (1987) vs Triumph Bonneville (2009) vs Norton Commando 961/SS (2005-06)
Comparison technical specifications
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| Make: | Norton | Triumph | Norton |
| Model: | Classic Rotary | Bonneville | Commando 961/SS |
| Years: | 1987 | 2009 | 2005-06 |
| Engine: | Twin chamber, rotary | Four stroke, parallel twin cylinder, DOHC, 4 valves per cylinder | Four stroe, Parallel twin, push-rod valve, 2 valves per cylinder, OHV |
| Capacity: | 588 cc / 35.9 cu in | 865 cc / 52.8 cu in | 961 cc / 58.6 cu-in |
| Compression Ratio: | 8.6:1 | 9.2:1 | 10.1:1 |
| Cooling System: | Air cooled | Air-cooled | Air cooled |
| Max Power: | 58.9 kW / 79 hp @ 9000 rpm | 49 kW / 66 hp @ 7250 rpm | 59.7 kW / 80 hp |
| Transmission: | 5 Speed | 5 Speed | 5-Speed |
| Final Drive: | Chain | Chain, X-ring | Chain |
| Front Suspension: | Ø38 mm Telescopic forks | 41mm Kayaba telescopic forks | Ø43 mm Telescopic fork, Öhlins |
| Front Wheel Travel: | 130 mm / 5.1 in | 120 mm / 4.7 in | 140 mm / 5.5 in |
| Rear Suspension: | Twin Girling gas units, 3-way preload, Koni | Kayaba chrome spring twin shocks with adjustable preload | Twin sided swingarm, twin shocks, pre-load adjustable |
| Front Brakes: | 2 x Ø265 mm discs | Single 310 mm disc, 2 piston calipers | 2 x Ø320 mm discs, 4-piston calipers, Brembo |
| Rear Brakes: | Single Ø265 mm disc | Single 255 mm disc, 2 piston calipers | Single Ø220 mm disc, 2-piston caliper, Brembo |
| Front Tyre: | 100/90-18 | 100/90 19 | 120/70-R17, Avon |
| Rear Tyre: | 110/80-18 | 130/80 17 | 180/55-R17, Avon |
| Dry-Weight: | 235 kg / 518 lbs | 205 kg / 451 lbs | 188 kg / 415 lbs |
| Fuel Capacity: | 23 L / 6.1 US gal | 16.6 Litres / 4.4 US gal / 3.7 Imp gal | 17 Litres / 4.5 US gal |