| MODEL | TRIUMPH SPEED TWIN 5T 1937 |
| Year | 1937 |
| Engine Type | Four stroke, parallel twin, OHV |
| Displacement / Capacity | 498 cc / 30.4 cu in |
| Bore X Stroke | 63 x 80 mm |
| Compression Ratio | 7:1 |
| Cooling System | Air cooled |
| Max Power | 20.9 kW / 28 hp @ 6000 rpm |
| Max Torque | — |
| Ignition | 6 V magdyno |
| Induction | — |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 4 Speed |
| Clutch | Wet, multi-plate |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Girder fork |
| Rear Suspension | Rigid, spring-loaded saddle |
| Front Brakes | Drum, 178 mm / 7 in |
| Rear Brakes | Drum, 178 mm / 7 in |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | 1397 mm / 55 in |
| Ground Clearance | — |
| Dry Weight | 166 kg / 365 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.25 x 20 |
| Rear Tyre | 3.50 x 19 |
| FUEL SYSTEM | |
| Fuel Capacity | — |
| Fuel Consumption | — |
| Top Speed | 145 km/h / 90 mph |
The 5T Speed Twin was Edward Turner's 500 cc parallel twin that launched at the 1937 show and reshaped Triumph's fortunes. Compact, light and quick for its day, it pulled British buyers from singles toward twins and set the layout for decades of British motorcycles. Early bikes had a girder fork, a rigid frame and an Amaranth red or black finish with gold lining.
