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 Triumph - T 150 V Trident
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Triumph D2-492-42-04
Photo ou archives : F-M. Dumas

Capacity : 750
Model : T 150 V Trident
Production : 1972 - 1975
Category : (R) Street Bike


750 Trident T150V · 1973

Delayed arrival

When, in 1961, the Triumph-BSA board ordered engineers Doug Hele and Bert Hopwood to increase the displacement of their Triumph twin to 750cc, the duo suggested that - to avoid excessive vibrations - it would make more sense to graft an extra cylinder onto a 500 twin.

Lack of Decision

According to Hopwood, this 750 threecylinder engine was ready for market as early as 1963. However, the BSA directors wouldn't give the go-ahead for another six years, when it was launched as a Triumph with vertical cylinders and a BSA with inclined cylinders.

Typically Triumph

The Triumph Trident engine – surprisingly small for a three-cylinder - had the same bore and stroke as the old Speed Twin. It was a typical Triumph design, with a heartshaped timing chest reminiscent of the marque's twins and camshafts set crosswise in the crankcase fore and aft of the cylinders. Conversely, the cycle part was old-fashioned, more like something designed in the mid- 1950s than the late 1960s, with its simple double-cradle frame and bolted-together rear end. However, that didn't stop the Trident from achieving some remarkable success on the race track - it even won the 1970 Bol d'Or - though its true debut on the international scene had to wait for the Daytona version, with its Rob Worth-designed frame.


Engine: 740cc (67x70mm) air-cooled threecylinder four-stroke

Power Rating: 58 hp @ 7250 rpm

Valves: overhead

Fuel System: three 26mm carburetors

Transmission: 5-speecl, chain final drive

Suspension: telescopic forks (front); swing arm (rear)

Brakes: disc (front); drum (rear)

Wheels: 4.10xl9 inch wire (front & rear)

Weight: 460 lb

Maximum Speed: 125 mph


Tbe T 150 V launched in 1973, gained a fivespeed transmission and a front disc brake but still lacked an electric starter and had lost the distinctive triple exhaust system.

Motorcycle encyclopedia Moto Passion, realised by François-Marie Dumas, include almost 2000 photos presented with an exhaustive history of the motorcycles exhibited.

This unique collection has been realised with the participation of many specialists. With many thanks in particular to Yves Campion, Michael Dregni, Didier Ganneau, Jean Goyard, Helmut Krackowizer, Michel Montange, Christian Rey, Bernard Salvat, Mick Woollett, etc

One can order here

  • Original cards on paper (in french)
  • High resolution scans or original documents presented and signed with my name.

Please contact me at for conditions and copyright.

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François-Marie Dumas

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