![]() ![]() The bike sported a 'siamese' (two-into-one) exhaust system and a 7-inch front brake. The power delivery made the mount ideal for off-road competition, for which the model is well known. The engine used 8.5:1 compression ratio and developed 42 bhp. ![]() The cast iron barrel was retained, but painted silver. The model used the same engine as the T110, but with the new "Delta" alloy cylinder head. The model was introduced in 1956 and named the TR6 Trophy-bird, borrowing its name from the Thunderbird model. The TR6 was developed and produced specifically for the US market, in particular, California desert racing. The success of these models and the 500-cc TR5 Trophy led to the creation of a 650-cc TR6 Trophy model. In 1954, the T110 model was introduced, a higher performance version of the Thunderbird. This was released to meet the demand for higher-capacity motorcycles, particularly from the United States, Triumph's largest export market. The genesis of the model came with the introduction of the 650-cc Thunderbird Model in 1950. Steve McQueen's fondness for the model is well known, as is his participation in the 1964 ISDT on a TR6 Trophy. ![]() The competition variant, popularly known as the "desert sled", won numerous competitions throughout the late 1950s and 1960s. During this time, it was a successful model, particularly in the US. The TR6 Trophy is a motorcycle that was made by Triumph, in Meriden, from 1956 to 1973, when it was replaced by the five-speed 750-cc Triumph Tiger TR7V. The unit 500 engine continued development in the parallel Tiger 100 range, ending with the Tiger Daytona models which ceased production in 1973.649 cc (39.6 cu in) four-stroke, parallel-twinģ4–46 bhp (25–34 kW) 6,500 rpm (claimed) Note the headlamp nacelle and rear 'bathtub' enclosure.įurther development led to the 1959 model 5TA with a unit engine and gearbox construction and styling changes including the unpopular 'Bathtub' fairing which became more and more abbreviated as the model developed before disappearing altogether for the last year of production in 1966. In 1953 the Speed Twin caused controversy among traditional British riders as the generator and magneto were replaced with a Lucas alternator and battery/coil ignition system. The headlamp and instrument area was tidied up in 1949 with the Turner-designed nacelle, a feature retained until the end of the model line. Development The drive side of a 1958 Speed Twin engineĪfter the war the recovery of Triumph at Meriden was largely due to the Speed Twin, which was developed in 1946 with a telescopic fork and optional sprung hub rear suspension. The Metropolitan Police Special Escort Group used the Speed Twin from 1952 until 1959. On the night of 14 November 1940 a German air raid destroyed much of the city centre of Coventry, and the Triumph factory, which was working on an order of thousands of military specification 5T's, was completely obliterated, along with all of Triumph's technical records, drawings and designs. Originally with a girder fork, the sprung saddle was the only rear suspension as the Speed Twin had a rigid frame – also from the single-cylinder production line. The two cylinders were fed by a single Amal Type 6 carburettor and many features such as the transmission and clutch were straight from the Triumph single. Initially the one piece iron cylinder was secured with six studs which led to weakness, so these were replaced by eight studs. Early models were only available in ' Amaranth red' with hand painted gold pinstripes to set off the chrome. History The timing side of 1937 Speed Twin engineĮdward Turner’s Triumph twin was a major turning point for the British motorcycle industry, as although a 500 cc parallel twin of medium capacity was not revolutionary, the 5T Speed Twin model was lighter than many contemporary singles with significantly more power and torque. ![]() After World War II the Speed Twin was responsible for the survival of Triumph, and several major British marques offered a 500 cc twin designed on similar lines to the Speed Twin. It was a 500 cc OHV vertical twin in a lightweight frame and the first truly successful British parallel twin, setting the standard for many twins to follow. Edward Turner, Triumph’s Chief Designer and Managing Director, launched the Triumph Speed Twin at the 1937 National Motorcycle Show. The Speed Twin 5T is a standard motorcycle that was made by Triumph at their Coventry, and later Meriden factories. 498 cc 360-degree parallel twin OHV four-stroke ![]()
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