The TR2 was introduced in 1953 as a successor to the Triumph TR1. It featured a 2.0-liter inline-four engine and a lightweight chassis. The body design was a traditional roadster with a long hood and distinctive headlights. The TR2 was popular for its performance and affordability.The TR3 succeeded the TR2 and continued the tradition of a two-seat roadster. It featured an updated version of the 2.0-liter engine, offering more power. In 1956, an optional “small mouth” version was introduced, altering the front grille design. The TR3 was well-received and became popular in sports car racing.

The TR4, introduced in 1961, marked a departure from the traditional body-on-frame construction used in the earlier TR models. It adopted a modern monocoque construction.
Michelotti, the Italian designer, gave the TR4 a squared-off design with a forward-leaning front grille. The 2.1-liter inline-four engine produced more power than its predecessor.
The TR4 featured a more refined interior compared to earlier models.

The TR4A, introduced in 1965, was an updated version of the TR4. One significant addition was the introduction of an independent rear suspension (IRS), improving ride and handling.
The TR4A was available in both a convertible and a surrey-top version, the latter featuring a removable roof panel. Despite the improvements, the TR4A was produced for a relatively short period before the TR5 (also known as the TR250 in the U.S.) replaced it.