Triumph Bonneville 650 T120 (1971) vs Triumph Speed Twin 1200 RS (2025) vs Triumph Speed Twin 1200 (2025)
Comparison technical specifications
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| Make: | Triumph | Triumph | Triumph |
| Model: | Bonneville 650 T120 | Speed Twin 1200 RS | Speed Twin 1200 |
| Years: | 1971 | 2025 | 2025 |
| 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 |
| Capacity: | 649 cc / 39.6 cu in | 1198 cc / 73.1 cu-in | 1198 cc / 73.1 cu-in |
| Bore x Stroke: | 71 x 82 mm | 97.6 x 80 mm | 97.6 x 80 mm |
| Compression Ratio: | 9.0:1 | 12.1:1 | 12.1:1 |
| Cooling System: | Air cooled | Liquid cooled | Liquid cooled |
| Induction: | 2 x 30 mm Amal concentric carburetors | Multipoint sequential electronic fuel injection | Multipoint sequential electronic fuel injection |
| Ignition: | Battery, coil | Digital | Digital |
| Starting: | Kick | Electric | Electric |
| Clutch: | Multi-disc, wet | Wet, multi-plate slip & assist clutch | Wet, multi-plate slip & assist clutch |
| 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 |
| Transmission: | 4 Speed | 6-Speed | 6-Speed |
| Final Drive: | Chain | Chain, X-ring | Chain, X-ring |
| Front Suspension: | Telescopic forks | 43mm USD Marzocchi forks, adjustable for pre-load, compression and rebound damping | 43mm USD Marzocchi forks |
| 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 |
| 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 |
| Rear Brakes: | Drum | Single 220 mm disc, Nissin 2-piston floating caliper | Single 220 mm disc, Nissin 2-piston floating caliper |
| Front Tyre: | 3.25 -19 | 120/70 ZR17 | 120/70 ZR17 |
| Rear Tyre: | 4.00 -18 | 160/60 ZR17 | 160/60 ZR17 |
| 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 |
| Wet Weight: | 181 kg / 399 lbs | 216 kg / 476 lbs | 216kg / 476 lbs |