The contact stress for roller bearings is shown over the axial position or the length of the roller. This example is for a cylindrical roller bearing under radial and axial load and without misalignment between inner and outer race.
Because of the tilting of rollers under axial load the radial load is not distributed equally over the length of the roller.
For axial cylindrical roller bearings and axial spherical roller bearings the roller orientations is inside to outside, while it is left to right for the other bearing types.