Introduced in 1956, the Triumph Trophy was well-suited to off-road use. Bikes of that era were not highly specialised the way they are today, but the Trophy leant toward utility and a broad range of uses relative to the street-sport Bonneville. By 1967, the Triumph Trophy TR6 had evolved from what some called a "street scrambler" in the direction of the Bonneville; it was street bike, not the multipurpose original Trophy.
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At the heart of the Triumph Trophy was a 649cc inline twin-cylinder four-stroke engine. It was air-cooled and had an overhead cam. Like the 1967 Bonneville 650, it had a bore of 71mm and a stroke of 82mm. The engine breathed through a single 30mm Amal Carb, unlike the Bonneville's twin Amal's. The lower head-flow, relative to the 1967 Bonneville produced slightly less than the "Bonnie's" 46 horsepower, but more than previous Trophy's 42 horsepower. Power was delivered from via chain and a four-speed transmission.
Chassis and Brakes
The Trophy TR6 employed a steel craddle frame with a steel swingarm and double rear shocks, typical of the period. The front suspension was provided by telescopic fork cartridges, protected with distinct, rubber fork-guards. Stopping power came from both front and rear drum brakes.
Changes for 1967
In 1967 Trophy, while not quite the street performer as the "Bonnie", with its single carburettor, got performance gains by increased compression from 8.5:1 to 9:1 which was higher than the Bonneville's. It also adopted the Bonneville's valve train, using the same cam profile.
The Trophy's Fame
The Triumph Trophy (pre-1967) was spotlighted in The Great Escape, with Steve McQueen showing off the motorcycle's abilities. On the small screen, the Trophy was among several motorcycles ridden by Happy Days' Arthur Fonzarelli, or "The Fonz". While the Fonz had been seen on Harley's and BSA's, he preferred Triumph's --- the Trophy, among them.
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