The Triumph Speed Twin designed by Edward Turner before the war was produced in large numbers after the war. Efforts to settle the Lend-Lease debts caused nearly 70% of Triumph's post-war production to be shipped to the United States. Post war, the Speed Twin and Triumph Tiger 100 were available with a sprung rear hub, Triumph's first attempt at a rear suspension. Privateers put wartime surplus aluminium alloy barrels on their Tiger 100 racers, and won races, inspiring the Triumph GP model. By 1950 the supply of barrels was exhausted, and the GP model was ended. The American market applied considerable demand to reverse this action, and a die-cast close finned aluminium alloy barrel was made available. The aluminium alloy head made the valve noise more obvious, so ramp type cams were introduced for aluminium alloy head models to reduce the noise. Another motorcycle based on the wartime generator engine was the 498 cc TR5 Trophy Twin, also introduced at the 1948 Motor Cycle Show. It used a single carburettor, low compression version of the Grand Prix engine. Britain won the prestigious 1948 International Six Days Trial. The Triumph works team had finished unpenalised. One team member, Allan Jefferies, had been riding what amounted to a prototype version.[6] To satisfy the American demand for motorcycles suited to long distance riding, Turner built a 650 cc version of the Speed Twin design. The new bike was named the Thunderbird (a name Triumph would later license to the Ford Motor Company for use for a car model). Only one year after the Thunderbird was introduced, a motorcyclist in Southern California mated the 650 Thunderbird with a twin carb head intended originally for GP racing and named the new creation the Wonderbird. That 650 cc motor, designed in 1939, had the world's absolute speed record for motorcycles from 1955 until 1970. The Triumph brand received considerable publicity in the United States when Marlon Brando rode a 1950 Thunderbird 6T in the 1953 film, The Wild One. The Triumph Motorcycle concern was sold to their rivals BSA by Sangster in 1951. This sale included Sangster becoming a member of the BSA board. Sangster was to become Chairman of the BSA Group in 1956. The production 650 cc Thunderbird (6T) was a low-compression tourer, and the 500 cc Tiger 100 was the performance motorcycle. That changed in 1954, with the change to swing arm frames, and the release of the aluminium alloy head 650 cc Tiger 110, eclipsing the 500 cc Tiger 100 as the performance model. In 1959, the T120, a tuned double carburettor version of the Triumph Tiger T110, came to be known as the Bonneville. As Triumph and other marques gained market share, Harley became aware that their 1-litre-plus motorcycles were not as sporty as modern riders would like, resulting in a decreasing share of the market. The Triumphs were models for a new, "small" Harley-Davidson as a result: the now-fabled Harley-Davidson Sportster, which started as Harley's version of a Triumph Bonneville. With its anachronistic V-twin, the Sportster was no match for the Bonneville, but it proved a solid competitor in US sales and eventually also in longevity. During the 1960s, despite internal opposition from those who believed that it would reduce the macho image of the brand, Triumph produced two scooters; the Triumph Tina, a small and low-performance 2-stroke scooter of about 100 cc with automatic clutch and a handlebar carry basket, and the Triumph Tigress, a more powerful scooter available with either a 175 cc 2-stroke single or a 250 cc 4-stroke twin engine for the enthusiast. In 1962, the last year of the "pre-unit" models, Triumph used a frame with twin front down-tubes, but returned to a traditional Triumph single front downtube for the unit construction models that ensued. The twin down tube, or duplex frame, was used for the 650 twins, as a result of frame fractures on the Bonneville. Introduced in 1959, for the 1960 model year, it soon needed strengthening, and was ended in 1962, with the advent of the unit engines for the 650 range. The 3TA (21) was the first unit construction twin, soon followed by the short-stroke, 490 cc "500" range. From 1963 all Triumph engines were of unit construction. In 1969 Malcolm Uphill, riding a Bonneville, won the Isle of Man Production TT race with a race average of 99.99 miles per hour (160.92 km/h) per lap, and recorded the first ever more than 100 miles per hour (161 km/h) lap by a production motorcycle at 100.37 miles per hour (161.53 km/h). For many Triumph fans, the 1969 Bonneville was the best Triumph model ever. American sales had already maximised, in 1967. In truth, the demand for motorcycles was increasing, but Triumph could not supply the demand. During the 1960s, 60% of all Triumph production was exported, which, along with the BSA's 80% exports, made the group susceptible to the Japanese expansion. By 1969 fully 50% of the US market for motorcycles more than 500 cc belonged to Triumph, but technological advances at Triumph had failed to match those of the foreign companies. Triumphs lacked electric start mechanisms, relied on push-rods rather than overhead cams, vibrated noticeably, often leaked oil and had antiquated electrical systems; while Japanese marques such as Honda were building more advanced features into attractive new motorcycles that sold for less than their British competitors. Triumph motorcycles, as a result, were nearly obsolete even when they were new. Further, Triumph's manufacturing processes were very labour-intensive and largely inefficient. Also disastrous, during the early 1970s the US government mandated that all motorcycle imports must have their gearshift and brake pedals in the Japanese configuration, which required expensive retooling of all the motorcycles for US sale. Triumph and BSA were well aware of Honda's ability but while the Japanese were only making smaller engined models, the large engine market was considered safe. When the first Honda 750 cc four cylinder was released for sale to the public, Triumph and BSA had trouble. Despite developing and releasing a 3-cylinder 750 cc engined motorcycle prior to the Japanese fours—the BSA Rocket 3/Triumph Trident—the Japanese bikes were praised in the press for their modernity (disc brakes, 4-cylinder engines, leak-free engine casings, etc.). The British triples outperformed the Japanese fours (top speed, acceleration and handling) but the Japanese fours required less maintenance and they did not leak. The 1970 Tiger/Bonneville re-design and taller twin front downtube oil tank frame had a mixed reception from Triumph enthusiasts at the time, and was insufficient to win back those already riding the Japanese bikes that had been sold since 1969—the Honda 750 Four, and the Kawasaki 500 Mach 3. The Triumph 350 cc Bandit received pre-publicity, but its development was quietly brought to an end. Triumph was still making motorcycles, but they no longer looked like the motorcycles Triumph fans expected. The Trident attracted its own market, but the Japanese motorcycles were improving more rapidly. The parent BSA group had losses of £8.5 million in 1971, £3 million for BSA motorcycles alone. The British government became involved. The company was sold to Manganese Bronze Holdings, which also owned Norton, AJS, Matchless, Francis-Barnett, James-Velocette and Villiers.

An outlaw motorcycle club is a motorcycle subculture that has its roots in the immediate post-World War II era of American society. It is generally centered on the use of cruiser motorcycles, particularly Harley-Davidsons and choppers, and a set of ideals that celebrate freedom, nonconformity to mainstream culture and loyalty to the biker group. In the United States, such motorcycle clubs are considered "outlaw" not necessarily because they engage in criminal activity, but because they are not sanctioned by the American Motorcyclist Association (AMA) and do not adhere to the AMA's rules. Instead the clubs have their own set of bylaws reflecting the outlaw biker culture. The U.S. Department of Justice defines "outlaw motorcycle gangs" (OMG) as "organizations whose members use their motorcycle clubs as conduits for criminal enterprises". While organizations may vary, the typical internal organization of a motorcycle club consists of a president, vice president, treasurer, secretary, road captain, and sergeant-at-arms(sometimes known as enforcer).[7] Localized groups of a single, large MC are called charters and the first charter established for an MC is referred to as the mother charter. The president of the mother charter serves as the president of the entire MC, and sets club policy on a variety of issues. Larger motorcycle clubs often acquire real estate for use as a clubhouse or private compound. Some "biker" clubs employ a process whereby members must pass several stages such as "friend of the club", "hang-around", and "prospect", on their way to becoming full-patch (see explanation of 'patching' below) members. The actual stages and membership process can and often does vary widely from club to club. Oftentimes, an individual must pass a vote of the membership and swear some level of allegiance to the club. Some clubs have a unique club patch (cut or top rocker)[9] adorned with the term MC that are worn on the rider's vest, known as a kutte. In these clubs, some amount of hazing may occur during the early stages (i.e. hang-around, prospecting) ranging from the mandatory performance of menial labor tasks for full patch members to sophomoric pranks, and, in rare cases with some outlaw motorcycle clubs, acts of violence. During this time, the prospect may wear the club name on the back of their vest, but not the full logo, though this practice may vary from club to club. To become a full member, the prospect or probate must be voted on by the rest of the full club members. Successful admission usually requires more than a simple majority, and some clubs may reject a prospect or a probate for a single dissenting vote. A formal induction follows, in which the new member affirms his loyalty to the club and its members. The final logo patch is then awarded. Full members are often referred to as "full patch members" or "patchholders" and the step of attaining full membership can be referred to as "being patched".

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