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Why was the Soviet BT tank unusually fast for its time?

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Kuwait: U.S. 1st Armored Division M1A1 Abrams tanks — tank M1A1 Abrams main battle tanks of the U.S. 1st Armored Division moving across the desert in northern Kuwait during the Persian Gulf War, February 1991.

The Soviet BT tank was the fastest tank of its day because it was based on experimental designs developed in the United States by J.W. Christie.1

Its superior speed and mobility were primarily due to two key features:
* Convertible Drive: The vehicle could run on wheels after its tracks were removed.1
* Independent Suspension: Far more significantly, the tank utilized road wheels that were independently suspended. This advanced suspension system allowed the tank to traverse broken ground at much higher speeds than vehicles equipped with earlier, more rigid types of suspension.1

While these design choices made the BT exceptionally fast, the tank remained lightly armoured, which limited its effectiveness in roles requiring close infantry support.1