Frame Rails
The frame rails are designed in the profile section as a double hexagon.
This optimal cross sectional geometry offers good exploitation of the available space.
Front axle attachments are integrated in the engine carrier and consists of an extruded part similar to the E39.
The wheel arch has a diagonal support on the front wheel arch liner that uses a technology called "IHPD" (internal high pressure deformation).
The frame rail and wheel house assembly has the advantage of reduced weight and increased rigidity. A similar IHPD section has been fitted in the E46 convertible located in the windshield frame as a rollover protective structure.
Because of their special properties, these profile sections cannot be reworked after a collision. They must therefore be replaced after any deformation.