| MODEL | TRIUMPH TR 6 TROPHY 1956 - 1959 |
| Year | 1956 - 1959 |
| Engine Type | Four-stroke parallel twin, OHV |
| Displacement / Capacity | 649 cc / 39.6 cu in |
| Bore X Stroke | 71 x 82 mm |
| Compression Ratio | 8.5:1 (US and export) / 7.0:1 (UK) |
| Cooling System | Air cooled |
| Max Power | 31.3 kW / 42 hp @ 6500 rpm |
| Max Torque | — |
| Ignition | Lucas magneto |
| Induction | Single Amal Monobloc carburettor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 4-speed |
| Clutch | Wet, multi-plate |
| Final Drive | Chain, 101 links |
| CHASSIS SPECS | |
| Frame | Brazed lug, rigid |
| Front Suspension | Telescopic fork, hydraulic damping |
| Rear Suspension | Swing arm, 2 x Girling dampers |
| Front Brakes | 178 mm / 7 in SLS drum |
| Rear Brakes | 178 mm / 7 in SLS drum |
| DIMENSION SPECS | |
| Overall Length | 2140 mm / 84 in |
| Overall Width | 700 mm / 27.5 in |
| Overall Height | — |
| Seat Height | 775 mm / 30.5 in |
| Wheelbase | 1397 mm / 55 in |
| Ground Clearance | 127 mm / 5.0 in |
| Dry Weight | 166 kg / 365 lbs |
| Wet Weight | 173 kg / 380 lbs |
| WHEEL SPECS | |
| Front Tyre | 3.25 x 19 |
| Rear Tyre | 4.00 x 18 |
| FUEL SYSTEM | |
| Fuel Capacity | 13.6 L / 3.6 US gal (US); 18 L / 4.8 US gal (UK and export) |
| Fuel Consumption | — |
| Top Speed | — |
Introduced in 1956 as a dual-purpose version of the 650 twin, the TR6 Trophy used the new alloy 'Delta' head and dropped the headlamp nacelle for a slim removable lamp. It was aimed chiefly at American off-road and desert riders, and shared parts with the 500 TR5.
