In 1961 Standard-Triumph introduced the Triumph TR4. The new car was based on the chassis and drivetrain of the TR3 sports car, but with a modern body designed by Michelotti. An unique option was an hard top that consisted off a fixed glass rear window and a integral rollbar called “Surrey Top” (five years before the Porsche 911/912 Targa). The Standard inline-four engine from the TR2/3 was continued but the displacement was increased from 1991cc to 2138 cc.
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| Triumph TR4 |
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| Predecessor Triumph TR3 |
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| Triumph TR4 with "Surrey Top" |
In 1965, the TR4A with IRS or independent rear suspension superseded the TR4. In 1968 the TR4A's venerable four-cylinder engine was replaced by Triumph's 2.5-litre straight-6 and called the TR5 in the UK and Europe. In the US it was called the TR250.
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| Triumph TR4A (1965) |
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| Triumph TR5/TR250 (1968) |
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| Triumph TR6 (1969) |
In 1969 the Triumph TR5/TR250 was succeeded by the Triumph TR6 styled by Karmann of West Germany.
Brochures
Triumph TR4 (USA, 1961)
Triumph TR4 (UK, 1962)
Advert Triumph TR4A (USA, 1960's)
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