> What does the tyre inflation pressure have to do with the pressure applied to the road due to the gross vehicle mass? > > Nothing. Well, the "pressure applie

> What does the tyre inflation pressure have to do with the pressure applied to the road due to the gross vehicle mass? > > Nothing. Well, the "pressure applied to the road" is approximately the same as the tire "inflation pressure"... It's not exactly the same because you need to take into account that the pressure in the tires increases (a bit) when you load the truck, and you have to be clear that you're talking about "overpressure", i.e. the relative pressure difference between the inside of the tire and the atmosphere. What I think you meant to say is "What does the tyre inflation pressure have to do with the force applied to the road due to the gross vehicle mass?" Then your conclusion ("Nothing") is correct.