Triumph Bonneville 650 T120 (1971) vs Triumph Speed Twin 1200 RS (2025) vs Triumph Speed Twin 1200 (2025) vs Triumph Speed Triple (2009) vs Triumph Speed Twin 500 (1947-58)
Comparison technical specifications
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| Make: | Triumph | Triumph | Triumph | Triumph | Triumph |
| Model: | Bonneville 650 T120 | Speed Twin 1200 RS | Speed Twin 1200 | Speed Triple | Speed Twin 500 |
| Years: | 1971 | 2025 | 2025 | 2009 | 1947-58 |
| Engine: | Four stroke, parallel twin, OHV | Four stoke, parallel twin, 270? crank, SOHC, 4 valve per cylinder | Four stoke, parallel twin, 270? crank, SOHC, 4 valve per cylinder | Four stroke, transverse three cylinder. DOHC, 4 valves per cylinder | Four stroke, parallel twin, OHV |
| Capacity: | 649 cc / 39.6 cu in | 1198 cc / 73.1 cu-in | 1198 cc / 73.1 cu-in | 1050 cc / 64.07 cu-in | 498 cc / 30.4 cub in. |
| Bore x Stroke: | 71 x 82 mm | 97.6 x 80 mm | 97.6 x 80 mm | 79 x 71.4 mm | 63 x 80 mm |
| Compression Ratio: | 9.0:1 | 12.1:1 | 12.1:1 | 12.0:1 | 7.2:1 |
| Cooling System: | Air cooled | Liquid cooled | Liquid cooled | Liquid-cooled | Air cooled |
| Induction: | 2 x 30 mm Amal concentric carburetors | Multipoint sequential electronic fuel injection | Multipoint sequential electronic fuel injection | Multipoint sequential electronic fuel injection | Single Amal carburetor 15/16" |
| Ignition: | Battery, coil | Digital | Digital | Digital inductive type | 6 V magnetic flywheel |
| Starting: | Kick | Electric | Electric | Electric | Kick |
| Clutch: | Multi-disc, wet | Wet, multi-plate slip & assist clutch | Wet, multi-plate slip & assist clutch | Wet, multi-plate | Wet,6 plate |
| Max Power: | 37.3 kW / 50 hp @ 7000 rpm | 77.2 kW / 103.5 hp @ 7750 rpm | 77.2 kW / 103.5 hp @ 7750 rpm | 94.9 Nm / 131 hp @ 9100 rpm | 20.9 kW / 28 hp @ 6000 rpm |
| Transmission: | 4 Speed | 6-Speed | 6-Speed | 6 Speed | 4 Speed, constant mesh |
| Final Drive: | Chain | Chain, X-ring | Chain, X-ring | Chain | Chain |
| Front Suspension: | Telescopic forks | 43mm USD Marzocchi forks, adjustable for pre-load, compression and rebound damping | 43mm USD Marzocchi forks | 45 mm Upside down forks with dual rate springs and adjustable preload, compression and rebound damping | Hydraulic telescopic fork |
| Rear Suspension: | Swinging arm, dual shocks | Twin ?hlins RSUs with external reservoirs, adjustable for pre-load, compression and rebound | Twin Marzocchi RSUs with adjustable preload | Monoshock with adjustable preload, compression and rebound damping | 1947-1954 sprung hub, after 1954 Swingarm with two shock absorbers |
| Front Brakes: | Drum | 2 x 320 mm discs, Brembo Stylema M4.30 radial calipers | 2 x 320 mm discs, Triumph branded four-piston radial calipers | 2 x 320 mm Discs, 4 piston calipers | Drum, 7 in SLS |
| Rear Brakes: | Drum | Single 220 mm disc, Nissin 2-piston floating caliper | Single 220 mm disc, Nissin 2-piston floating caliper | Single 220 mm disc, 2 piston caliper | Drum, 7 in SLS |
| Front Tyre: | 3.25 -19 | 120/70 ZR17 | 120/70 ZR17 | 120/70 ZR17 | 3.25 - 19, Dunlop Universal |
| Rear Tyre: | 4.00 -18 | 160/60 ZR17 | 160/60 ZR17 | 190/50 ZR17 | 3.50 - 19, Dunlop Universal |
| Fuel Capacity: | 16L / 4.2 US gal / 3.5 Imp gal | 14.5 Litres / 3.8 US gal | 14.5 Litres / 3.8 US gal | 18 Litres / 4.89 gal | 18 L / 4.8 US gal / 4.0 Imp gal |