Triumph TR6 Trophy

Make Model	Triumph TR6 Trophy
Year	1956 - 60
Engine	Four stroke, parallel twin
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
Induction	Single Amal Monobloc carburetor
Ignition	Lucas magneto
Starting	Kick
Max Power	31.3 kW / 42 hp @ 6500 rpm
Clutch	Wet, multi-plate
Transmission	4-Speed
Final Drive	Chain, 101 links
Gear Ratios	1 st 11.2 / 2nd 7.8 / 3rd 5.5 / 4th 4.6:1
Frame	Brazed lug, rigid
Front Suspension	Telescopic fork, hydraulic damping
Rear Suspension	Swing arm, 2 x Girling dampers
Front Brakes	178 mm / 7" SLS drum
Rear Brakes	178 mm / 7" SLS drum
Front Tyre	3.25 x 19 Dunlop
Rear Tyre	4.00 x 18 Dunlop
Dry Weight	166 kg / 365 lbs
Wet Weight	173 kg / 380 lbs
Dimensions	Length: 2140 mm / 84 in Width: 700 mm / 27.5 in
Wheelbase	1397 mm / 55 in
Ground Clearance	127 mm / 5.0 in
Seat Height	775 mm / 30.5 in
Fuel Capacity	US: 13.6 L / 3.6 US gal / 3 Imp gal / UK and export: 18 L / 4.8 US gal / 4 Imp gal

With the new cylinder head came an all new motorcycle, indeed an all new type of motorcycle, the 1956 Triumph TR6 Trophy. It was a dual-purpose bike, street legal but offroad-capable with knobby tires, minimal fenders (mudguards) & high pipes. The TR6 was clearly intended for the wide open spaces of America and the burgeoning off-road & desert racing market in the US (although it was also available in the UK and other export markets).

One interesting feature came with the elimination of the Tiger and T-Bird twins' clunky headlight nacelle. The 1956 Triumph TR6 came with a sleek, tidy removable headlight with detachable wiring & even a detachable dynamo. The 1956 Triumph TR6 shared much with its smaller brother, the 500cc TR5. These included the primary chaincase, detachable dyno, oil tank, and slim dual seat. The 3-gallon fuel tank and siamesed 2-into-1 side exhaust running high along the left side (two side pipes, one on each side, became available late in the model year) completed the off-road package. Was it effective as a dirt bike? Well, at the prestigious 1957 Big Bear Run Enduro in California, TR6 Trophies took no less than the first 12 places overall!! The TR6 legend was off & running.

Source: Classic British Motorcycles