Front part of a motor vehicle and stiffening thereto

A plate-shaped bumper stiffening 10 comprises at least one rib 17 projecting from a first main surface of the plate 16 and extending in the longitudinal direction of an impact to be absorbed by the shock absorber stiffening 10wherein the compressive strength in longitudinal direction of the rib 17 at its ends is higher than in its middle. The width, wall thickness and wall height of the rib 17 may be smaller in the middle than at its ends. A second main surface may have channels 18 or grooves which engage in the ribs 17. The plate may further comprise an outer flange 15 which is fastened to the bottom of the load bearing body structure.