The Triumph Trident and BSA Rocket 3 was a technically advanced, high-performance roadster (or standard) motorcycle made by Triumph Engineering and BSA (both companies part of the Birmingham Small Arms Company) from 1968 to 1975, and sold under both the Triumph and BSA marques.[1] Alongside the Honda CB750, and later the two-strokeKawasaki triples, it brought a new level of sophistication to street motorcycles, marking the beginning of the superbike era.[3][4][5] The Honda CB750 overshadowed the Trident to be remembered as the 'first superbike', in spite of the Triumph Trident actually debuting before the Honda by a few weeks.[3][4][5]
It had a 58bhp (43kW), 740-cubic-centimetre (45cuin)air-cooledOHVunit constructionstraight-three engine, with four gears and a conventional chassis and suspension.[2] The engine had less vibration than the existing 360° twins. The Rocket 3/Trident was part of Triumph's plan to extend the model range beyond their 650cc parallel twins. It was the last major motorcycle developed by Triumph at Meriden, West Midlands, created to meet the demands of the US market. Although BSA experienced serious financial difficulties, 27,480 Rocket 3/Tridents were produced during its seven-year history.[6]
Although the prototype was ready by 1965, the factory delayed for years for a cosmetic redesign which meant that its eventual introduction was overshadowed by the apparently more modern Honda CB750, introduced in 1969.
Unlike the CB750 and other Japanese superbikes which had horizontally split crankcases, the Trident engine was essentially a vertically split parallel twin with a separate central chamber to accommodate the third cylinder. Whereas the Speed Twin was a traditional British twin with a 360° crankshaft, this new triple had crankpins offset 120° and so inherently had much smoother primary balance, albeit with a rocking couple. Although most British motorcycles used a wet multiplate clutch, this triple had a dry single-plate clutch in a housing between the primary chaincase and the gearbox. Mounted on the end of the gearbox mainshaft (where the clutch would be expected) was a large transmission shock-absorber.
Test engineers developed the chassis' handling characteristics by affixing lead weights on a standard 650 Bonneville. The first prototype (P1) was running by 1965, and it seemed[to whom?] that Triumph might have a machine in production by 1967. However, the decision to produce a BSA version with sloping cylinders and employ Ogle Design to give the early Tridents/Rocket 3s their "square tank" added bulk and 40lb (18kg) of weight, delaying production by 18 months.[8] In 1966 a P2 prototype was produced with a more production-based Trident engine, different bore and stroke dimensions and improved cooling. Hele got 90bhp (67kW) from a Trident engine, leading to speculation[by whom?] that further development might have led to a 140mph (230km/h) British superbike.
All the three-cylinder engines (and the Rocket 3 motorcycles) were produced at BSA's Small Heath site, but final assembly of the Triumph Trident model was carried out at Meriden in Coventry. The major differences were the engine and frame: the BSA had an A65-style double-loop cradle frame (with engine mounted at a slant), while the Triumph had a Bonneville-style single downtube frame with vertical cylinders. Other differences were cosmetic. Though the badges on the actual bike said Rocket 3, the BSA-branded bike's name was styled in print as Rocket III in BSA's own advertising, but in third party media it was printed as Rocket 3, or sometimes Rocket Three.[9] Triumphs sold better in the US, despite BSA's Daytona racing successes during the early 1970s. Sales did not meet expectations; for the 1971 model year a fifth gear was added, creating the BSA A75RV and Triumph T150V. BSA were having financial difficulties, and only some 205 five-speed Rocket 3s were built before production of the BSA variant ceased. Production of the five-speed Triumph T150V (with a front disc brake replacing the original drum) continued until 1974.
For the 1975 model year, the Trident was updated to the T160 which was given electric starting, front and rear disc brakes, and a left-foot gear change. Like the Rocket 3, the T160 also featured a forward-slanted cylinder block, which gave better weight distribution and more space behind the engine for ancillaries.
Reception
BSA Rocket 3, restyled for 1971
The prototype triples had the "Triumph look", with a teardrop-shaped tank. BSA/Triumph then commissioned Ogle Design for a redesign, leading to an 18-month delay. The new motorcycle had a squarer fuel tank and a less-traditional look, with sloped cylinders and "ray-gun" silencers.
The Rocket 3/Trident was introduced in summer of 1968 to critical acclaim, but was eclipsed four weeks later by the Honda CB750.[2] Compared to the British triple, the CB750 had a five-speed gearbox, overhead camshaft, oil-tight engine, electric start and a disc brake. The Honda outsold the Triumph in the US market; in 1970, to revive sales Triumph restyled export versions with the "classic" look.
In 1968 the new triples disappointed the American BSA-Triumph management, who knew that Honda had a motorcycle under development. They felt the price of $1,800 (£895) was too high, and technical details (like vertically split crankcases and a pushrod OHV valve train were too conventional.[10] However, they acknowledged that the bike was fast and the US sales team launched it by setting speed records at Daytona (which were only broken in 1971 by the Kawasaki Z1).
Cycle World recorded a top speed of 117.03mph (188.34km/h) in their 1968 road test, along with acceleration times of 0 to 60mph (0 to 97km/h) of 5.6 seconds and 0 to 1⁄4mi (0.00 to 0.40km) in 13.71 seconds at 98.46mph (158.46km/h).[1] The magazine's braking test was 60 to 0mph (97 to 0km/h) in 157.0ft (47.9m), and the fuel consumption was 20.3mpg‑US (11.6L/100km; 24.4mpg‑imp).[1]
US BSA vice-president Don Brown felt that the BSA/Triumph triples needed a different look to succeed in the US. He commissioned designer Craig Vetter to redesign the BSA A75 (making it sleeker and better balanced) and disclosed the Vetter project to Peter Thornton (president of BSA/Triumph North America). In October 1969, Vetter displayed his customised A75. The bike was then sent to the UK, where it received a lukewarm reception from chief designer Bert Hopwood (but a favourable public reaction); the Vetter BSA Rocket 3 became the Triumph X-75 Hurricane.
Model T160
1975 Trident T160 with electric starting, front and rear disc brakes and left-foot gear change
In November 1974, the T150V was succeeded by the modified T160. Some changes were due to market response to the earlier Tridents; others complied with American safety legislation. With forward-sloping cylinders (like the BSA Rocket 3), electric start and a left-hand gearshift, NVT made a final effort to save large-scale production and reduce the gap between the Trident and the Honda CB750. The T160 was manufactured for a little over a year, with production ending in early 1976 (when NVT collapsed).[11] Around 7,000 T160 models were built for the 1975 model year; due to slow sales some were still being sold as late as the end of 1977.[12]
Changes on the T160:
Forward-leaning cylinder layout derived from BSA Rocket 3 (allowing a larger air box)
Improved centre of gravity
Electric start
Five-speed gearbox (first used on the T150V)
Left-side foot gear shift (US safety requirement)
Front and rear disc brakes
Annular silencers (to meet lower US noise-level requirement)
Redesigned instrument panel and handlebar switchgear
Return to traditional Triumph styling
Cardinal
In December 1975 final shipments of 288 and 224 motorcycles were destined for Australia and the US, respectively, but NVT diverted them to fill an order from the Saudi Arabian police force. Most UK police had switched to BMW motorcycles, but a few (such as the Yorkshire Constabulary) still used the Trident. About 450 bikes were sent to Saudi Arabia; the last 130 were still in the UK when the Saudis cancelled the remainder of the order, and NVT Motorcycles sold them as the Triumph Cardinal. At the time, the list price of a stock T160 was £1,215;[13] although the "police accessories" were worth only £150, NVT listed the Cardinal for £1,522.80. In 1982, European dealers imported about 180 low-mileage Tridents from Saudi Arabia; the poorly maintained, sand-encrusted machines were restored and sold as standard T160s.
The Triumph Quadrant was designed and built by Doug Hele in 1973.[14] It was a 1,000cc four-cylinder motorcycle made from Trident parts (although the camshaft was sourced outside the factory). The fourth cylinder resulted from grafting an extra mid-crankcase unit; since the primary chaincase and final drive sprocket could not be moved, the fourth cylinder protruded from the right side of the bike.
Why Hele developed this machine is unknown, since the lopsided design could never compete with Japanese motorcycles such as the Honda CB750 or the Kawasaki Z1. An inside view is that Hele's efforts were a waste of resources that, with NVT's precarious finances, should have been directed to marketing the 900cc triple Thunderbird III.[15]
Model T180 Thunderbird III
In 1975 an NVT prototype 870cc triple, the T180[16] Triumph Thunderbird III, was developed but it did not reach production. NVT passed on the prototype to the Meriden co-operative, which also did not proceed to production (despite experimenting with the engine in an oil-bearing frame).[16][17]
A prototype "Norton 900 Commando"[18] was also built with the T180 engine in a Norton Commando frame.[16]
Racing
Rob North framed BSA Rocket 3 F750 class at the Sammy Miller Museum
Doug Hele continued to develop the engine, and in 1971 joined frame expert Rob North to produce the Formula 750 racing machines. At the 1971 Daytona 200 the British three-cylinder bikes took the top three places; Dick Mann won on a BSA Rocket 3, followed by Gene Romero on a Triumph Trident and Don Emde third on another BSA Rocket 3.[19]John Cooper rode a BSA Rocket 3 to an upset victory over 500cc world champion Giacomo Agostini in the 1971 Race of the Year at Mallory Park.[20] Cooper finished three-fifths of a second ahead of Agostini's MV Agusta.[21]
The best-known bike was a production-class Trident prepared by a team led by Les Williams called Slippery Sam, a roadster prepared for production-class road racing to controlled specifications using selected adaptations only, available from the factory as part-numbered inventory. Williams' team won consecutive 750cc production races at the Isle of Man TT for the five years between 1971 and 1975, and in the new F750 event for race-specification machines, Triumph and BSA machines with Rob North frames placed first and second.[22]Bert Hopwood recommended a production version of the racing triple, producing 84bhp (63kW) at 8,250rpm, but his suggestion was not adopted. Further racing development was done in Duarte, California under racing manager Dan Macias.
Tom Mellor set four world speed records at the Bonneville Salt Flats in September 2008 with a 1969 Triumph Trident T150.[23]
End of production
Financial and management problems at BSA and the disintegration of the British motorcycle industry during the early 1970s led to a government-sponsored merger, "NVT", in July 1973 with Norton. Although Norton was very much smaller than BSA-Triumph,[24] and it had only one product, the ageing pre-unitCommando, nevertheless control of NVT was given to Dennis Poore, the boss of Norton. Poore was much more "in tune" with motorbikes than were the BSA management, but Poore's business plan proved to be an asset-strip of BSA for Manganese-Bronze, rather than a consolidation of the remnants of the UK motorcycle industry. NVT's restructuring plans triggered a strike at Triumph's Meriden factory in September 1974. Production of the Trident was eventually transferred to BSA's Small Heath factory in March 1974, but the lengthy labour dispute disrupted production, and very few Small Heath Tridents came into being.[25][15]
The last machine off the assembly line at Small Heath, a police-specification Triumph Trident for Saudi Arabia, was produced on 18 December 1975.[26]
Later use of Trident and Rocket names
After Triumph at Meriden collapsed, a new firm, Triumph Motorcycles Ltd, was established at Hinckley. The new firm manufactured from 1990 a new range of motorcycles with a modular engine design. Some of these bikes were called "Triumph Tridents"; and much later a "Triumph Rocket III" was produced.
1 2 Lyons, Peter (January 1992), "Revolution! The first modern superbikes and how they shook the motorcycle world", Cycle World, vol.31, no.1, pp.52–56
Triumph Engineering Co Ltd was a British motorcycle manufacturing company, based originally in Coventry and then in Meriden. A new company, Triumph Motorcycles Ltd, based in Hinckley, gained the name rights after the end of the company in the 1980s and is now one of the world's major motorcycle manufacturers.
The Honda CB750 is an air-cooled, transverse, in-line-four-cylinder-engine motorcycle made by Honda over several generations for year models 1969–2008 with an upright, or standard, riding posture. It is often called the original Universal Japanese Motorcycle (UJM) and also is regarded as the first motorcycle to be called a "superbike".
The Triumph Rocket III is a three-cylinder motorcycle made by Triumph Motorcycles Ltd. At 2,294 cc (140.0 cu in) it had the largest-displacement engine of any production motorcycle until 2019 when Triumph released the Triumph Rocket 3.
A motorcycle engine is an engine that powers a motorcycle. Motorcycle engines are typically two-stroke or four-stroke internal combustion engines, but other engine types, such as Wankels and electric motors, have been used.
The Honda CB450 is a standard motorcycle made by Honda from 1965 to 1974 with a 444 cc (27.1 cu in) 180° DOHC straight-twin engine. Producing 45 bhp, it was Honda's first "big" motorcycle, though it did not succeed in its goal of competing directly against the larger Triumphs, Nortons, and Harley-Davidsons in the North American market at the time. As a result, Honda tried again, leading to the development of the four cylinder Honda CB750 that marked a turning point for Honda and beginning of the "superbike" era of motorcycles.
The Triumph Thunderbird is a British motorcycle that was introduced by Triumph in 1949 and produced in many forms until 1966. The name was used three more times for new and distinct Triumph models.
The Triumph Trident is a three-cylinder motorcycle of either 750 cc or 900 cc capacity. These bikes were produced from 1991 to 1998 at Hinckley, Leicestershire, England, by Triumph Motorcycles Ltd, the successor business to the defunct Triumph Engineering at Meriden Works, Warwickshire, England.
Norton Villiers Triumph (NVT) was a British motorcycle manufacturer, formed by the British government to continue the UK motorcycling industry, until the company's ultimate demise.
The so-called Triumph Quadrant was a "bitsa" designed and built in secret by Doug Hele in 1973. It was a 1,000 cc four-cylinder motorcycle made up from Trident parts. Essentially, the fourth cylinder came from grafting on an extra middle crankcase unit; but since the primary chaincase and final drive sprocket could not be relocated, the fourth cylinder protruded on the right hand side of the bike. The top speed was reputedly 125 mph.
The Kawasaki Z1 is a four-cylinder, air-cooled, double-overhead camshaft, carbureted, chain-drive motorcycle introduced in 1972 by Kawasaki. Following the introduction of Honda's CB750 in 1968, the Z1 helped popularize the in-line, across-the-frame four-cylinder, a format that became known as the Universal Japanese Motorcycle or UJM.
Douglas Lionel Hele was a pioneering British motorcycle engineer with Triumph and other firms: BSA, Douglas and Norton. He was born in Birmingham in 1919 and died in Hagley, Worcestershire on 2 November 2001.
The Triumph X-75 Hurricane was a 'factory special' motorcycle designed by fairing specialist Craig Vetter. The X-75 had swooping glassfibre bodywork, a three US-gallon petrol tank, lowered gearing and a distinctive triple exhaust on the right-hand side. The motorcycle is credited with creating a new class of motorcycle, the cruiser.
Triumph Motorcycles Ltd is the largest UK-owned motorcycle manufacturer, established in 1983 by John Bloor after the original company Triumph Engineering went into receivership. The new company, initially called Bonneville Coventry Ltd, continued Triumph's lineage of motorcycle production since 1902. They have major manufacturing facilities in Thailand.
The Triumph Bandit was a British motorcycle manufactured as a prototype by Triumph in 1970. Originally designed by Edward Turner as his last project it was subsequently substantially modified at Triumph by a greatly critical Bert Hopwood and Doug Hele. Despite their work, the Bandit never went into commercial production, and only five have survived, making them very rare.
The isolastic frame, designated by Norton as GlideRide, used a system of engine-to-frame mountings incorporating rubber bushes to isolate the vibration of the vertical twin engine from the frame and rider. The isolastic frame was developed for use with the Commando inclined engine, whilst the Featherbed frame continued in production for the Mercury with a softer-specification 650 cc vertical-engine until 1970.
Norman Hyde is a British motorcycle development engineer, racer, and world record holder.
Slippery Sam is a British production class racing motorcycle from the early 1970s that used a carefully prepared version of the 750 cc Triumph Trident ohv (pushrod) three-cylinder engine. The "Slippery Sam" name was acquired during the 1970 Bol d'Or, a 24-hour race for production-based machines held in France, when engine difficulties and escaping oil covered the bike of Triumph employee Percy Tait and co-rider Steve Jolly who managed to finish in fifth place to winners Paul Smart and Tom Dickie on another works Trident.
BSA motorcycles were made by the Birmingham Small Arms Company Limited (BSA), which was a major British industrial combine, a group of businesses manufacturing military and sporting firearms; bicycles; motorcycles; cars; buses and bodies; steel; iron castings; hand, power, and machine tools; coal cleaning and handling plants; sintered metals; and hard chrome process.
The BSA unit twins were a range of unit construction twin-cylinder motorcycles made by the Birmingham Small Arms Company (BSA) and aimed at the US market. A range of 500 cc (31 cu in), 650 cc (40 cu in) and 750 cc (46 cu in) twins were produced between 1962 and 1972, but they were really developments of the older pre-unit A7/A10 model range with less weight. The engines had a reputation for vibration, but acceleration was good for the time, to a top speed of 100 miles per hour (160 km/h).
The BSA/Triumph racing triples were three cylinder 750 cc racing motorcycles manufactured by BSA/Triumph and raced with factory support from 1969-1974. There were road racing, production racing, endurance racing and flat track variants. The machines were based on the road-going BSA Rocket 3/Triumph Trident.
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