Launched in 1953, the TR2 was developed for the American market after the Triumph TRX concept based on the Standard 1800 was dropped. To produce the TR2 cheaply it raid the Standard and Triumph parts bins for its twin-carb Standard Vanguard engine which produced around 90bhp. The body was designed by Walter Belgrove , using where possible straight panels because curved ones were more expensive to manufacture. The TR2 sat on unused Standard Nine chassis with the front suspension from a Triumph Mayflower. From these unlikely beginnings a dynasty was created that evolved into the 1955 TR3 with 1991cc engine, and the TR3A in 1957. Giovanni Michelotti was commissioned to produce a new body for the 1961 TR4, but underneath the older chassis was retained. The next evolution was the TR4A from 1965 with an improved chassis and optional Independent Rear Suspension. From 1967 Triumph extended the engine from 4-cylinders to 6-cylinders and 2498cc and then added Lucas fuel injection marketed as the TR5. The North American market were given a carburated version of the TR5 sold as the TR250. Only a year later Triumph had visited Osnabruk and come back with a heavily redesigned body from Karmann that was sold as the Triumph TR6 from 1968 to 1976. It was back to Britain for the radical wedge-shaped TR7 and TR8 which were designed by Harris Mann and based on the chassis and mechanics of the Triumph Dolomite. The Final iteration was the short-lived the Triumph TR8 which replaced the 4-cylinder engine with the Rover V8.