This is a modification of the perimeter frame, or of the spine frame, in which the passenger compartment floor, and sometimes additionally the luggage compartment ground, have been built-in into the frame as loadbearing parts, for further strength and rigidity. Neither floor items are merely sheet steel straight off the roll, however have been stamped with ridges and hollows for additional strength. In addition to a lowered roof, the perimeter body allows lower seating positions when that is fascinating, and provides higher security within the event of a side impact. However, the design lacks stiffness, as a result of the transition areas from front to heart and center to rear reduce beam and torsional resistance, and is utilized in combination with torque bins and gentle suspension settings. This design offers good beam resistance because of its continuous rails from front to rear, but poor resistance to torsion or warping if simple, perpendicular cross-members are used.
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