Triumph 6T Thunderbird (1950-53) vs Triumph Speed Twin (2019)
Comparison technical specifications
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| Make: | Triumph | Triumph |
| Model: | 6T Thunderbird | Speed Twin |
| Years: | 1950-53 | 2019 |
| Engine: | Four stroke, vertical twin, OHV | Four stoke, parallel twin, 270o crank, SOHC, 4 valve per cylinder |
| Capacity: | 649 cc / 40.0 cu in | 1198 cc / 73.1 cu in |
| Bore x Stroke: | 71 x 82 mm | 97.6 x 80 mm |
| Cooling System: | Air cooled | Liquid cooled |
| Compression Ratio: | 8.5:1 (Export), 7.0:1 (UK) | 11.0:1 |
| Exhaust: | Two-into-two | Brushed 2-into-2 exhaust system with twin silencers |
| Induction: | 1 x Amal Monobloc, 25 mm (1953: SU type MC2) | Multipoint sequential electronic fuel injection |
| Ignition: | Lucas magneto | Digital |
| Starting: | Kick | Electric |
| Max Power: | 25 kW / 34 hp @ 6500 rpm | 71.5 kW / 96 hp @ 6750 rpm |
| Clutch: | Wet, multiplate | Wet, multi-plate assist clutch |
| Transmission: | 4-Speed constant mesh | 6-Speed |
| Final Drive: | Chain, 101 links | Chain, X-ring |
| Frame: | Brazed lug | Tubular steel with aluminum cradle |
| Front Suspension: | Telescopic fork, hydraulic damping | 41mm cartridge forks |
| Rear Suspension: | Rigid, spring loaded saddle | Twin-sided, aluminum swingarm, twin shocks with adjustable preload |
| Front Brakes: | SLS drum, 7 in | 2 x 305 mm discs, Brembo 4-piston fixed calipers, ABS |
| Rear Brakes: | SLS drum, 7 in | Single 220 mm disc, Nissin 2-piston floating caliper, ABS |
| Wheelbase: | 1403 mm / 55.25 in | 1430 mm / 56.3 in |
| Seat Height: | 775 mm / 31 in | 807 mm / 31.8 in |
| Dry Weight: | 168 kg / 370 lbs | 196 kg / 432 lbs |
| Fuel Capacity: | 13.6 L / 3.6 US gal / 3.0 Imp gal (US), 18 L / 4.8 US gal / 4.0 Imp gal (UK and export) | 14.5 Litres / 3.8 US gal |