Tiger 90, high performance 350 3TA introduced, similar to T100S/S. All 650s, (including Bonnies, Tbirds, TR6, Trophy) are built with a new unit construction engine/gear box. In 1967 Triumph and BSA set up an expensive, common research laboratory at Umberslade Hall (becoming known as "Slumberglade Hall," "Marmalade Hall" and "Mecca" because they "mecca balls up of everything"). The employees are predominantly engineers, many fresh from university, few (if any) are initially from the motorcycle industry. A massive computer system worthy of NASA is installed. This year 28,700 Triumphs are sold in the USA, mostly Bonnevilles, but about 30 per cent were Trophies (TR6). This was the peak year for Triumph exports to the USA, selling 24,700 machines for 7.5 million pounds. In 1968 there was a late summer announcement of a three-cylinder 750cc Trident T150; 58bhp, 125mph.

In 1972 the company decides to reduce its workforce from 3,000 employees (1,750 at Meriden alone) to 1,000 by consolidating production. An estimated 250,000 Bonnies built. TR6 becomes TR6R Tiger 650 for road and TR6C Trophy 650 for trail (replacing the Tiger 100 offroad). The Trophy Trail would later become named the TR5 Adventurer. Trident (now the T150V) and 650s go to five-speed gearboxes but brittle metal results in broken gear teeth on many bikes. T120RV gets optional 5-speed gearbox (standard on the T150). Umberslade Hall closed in January. BSA put into productiona new tripple in June with American styling, but as BSA was in its death throes, the tank badges were changed to Triumph and it was called the X75 Hurricane.