With a peace treaty Polish armored forces were reorganized along French lines. While the armored cars were given to the Cavalry, the tanks became part of the Infantry and were established into a tank regiment of three battalions.

Between 1923 and 1930, most of the activities of the Poles in the tank development field were concentrated on continuous attempts to improve the Renault FT tank. Some redesigns were to increase the performance to 13kmh. A small number of Renault FT tanks were rebuilt into specialized test variants including smoke producer tanks and radio command tanks.

In 1928 Vickers of Great Britain developed the two man "Vickers Carden-Loyd Mark VI tankette". This outstanding design attracted a great deal of attention worldwide. Poland purchased one unit and went on to produce a domestic version based on this model. Designated TK-1, the Polish tankette was a 1.75 ton, 2-man vehicle powered by a Ford motor. The TK-2 development led to the heavier TK-3, which was accepted as the production model. The TK-3 became the first armored tracklaying vehicle manufactured in quantity in Poland.

The year 1930 was marked by significant events in the Polish military. The infantry tank regiment, the cavalry armored squadrons, and the artillery armored trains, were combined into an independent branch of the service called the Bron Pancerna.

The Bron Pancerna needed a more powerful armored vehicle. Poland to turned her attention to a further Vickers product - the Vickers Mark. Between 1930 to 1939, Vickers sold over 190 tanks that type to foreign countries such as Bolivia, Bulgaria, China, Finland, Greece, Japan, Portugal, Russia and Thailand. But, the largest order came from Poland with total of 50 (other sources state 38) tanks with the single and twin turret design.

The Vickers design offered some potential for further development. The PZI design bureau was tasked with the study of making a homemade copy. PZI produced the 7-TP, a 9-ton twin turreted tank that was to be a considerable step forward in design over the Vickers original. At first the original engine of the Vickers was installed, but this was replaced by a license-built Saurer 6-cylinder diesel engine which developed 110hp. This made the Polish 7-TP the world's first diesel-powered tank to reach production status. The 7-TP's armor was also 4mm thicker than the Vickers originals. The first 7-TP to be built by PZI left the works in 1934. While the production of the modified twin turret model 7-TP was proceeding, it was decided to introduce a single version carrying a Bofors gun. This variant appeared in 1937, but the production was slowed by the difficulties of making armor plates and procuring the turrets from Sweden.