Computer Aided Engineering (CAE) FEA Case Study: Results Displacement
Knowing where the FEA displacements take place, it's not always intuitive 
Wheel: Above left, displacement range from 99.9mm to 100mm! This is due to the spring element 'absorbing' all the load and displacing (compressing) itslef by 100mm. This is exactly how much it should be compressing for a 10kN load, hence we know the entire load is being reacted through the wheel. The difference of 0.1mm is due to the strains taking place within the wheel under load. These strains give the stresses, both compressive and tensile.
Tyre: Above right, displacement from 55.9mm to 210mm. This is due to large deformations of the rubber under load. All measurements are relative to the part co-ordinate system, hence the measurement or total deflection is dependant on the vector of the displacement, some are negative and some positive. The side wall of the tyre looks too stiff due to the load forming a 'trough' in the tyre, rather than the complete tyre 'flattening' upon loading, hence a better linear statics approximation should be derived, which could change stresses in the wheel rim.