The Triumph TR4 is a sports car produced by the Triumph Motor Company from 1961 to 1965. Alongside the standard TR4 Base Model, a later variant, the TR4A, with IRS (independent rear suspension), was produced until 1967. These cars were often converted to Race Cars. As the successor to the TR3A, the car was based on the chassis and drivetrain of the previous TR sports cars, but with a modern body designed by Michelotti. In spite of its modern styling, a total of only 40,253 cars were built during its 5-year production run. In comparison, 74,800 TR3's were sold in an 8-year run and 94,500 TR6's in an 9-year run from 1968-1976.