In order to meet the requirements of weighing less than the then overweight AMX-50, the tank had drastically thinner armor. It was of welded construction, with thicknesses of 25 to 40mm. The tank was equipped with 10 Veil Picard tires (5 on each side) instead of steel road wheels to save weight. The inclusion of these tires also increases crew comfort by reducing vibrations and shocks when the vehicle was in motion. These attributes were carried over from the Canon D’Assaut Lorraine.

https://tanks-encyclopedia.com/coldwar/france/lorraine-40t

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