The Mazda CX9 body shell has a highly rigid structure in the lower body with multiple cross members under the floor, a reinforced upper body area at the C-pillar, a high-tensile steel B-pillar and special roof reinforcements. This structure is made even more robust by the incorporation of crossing seat frames between the cross member of the floor and by the use of more laser spot welds and weld bonds than most of its competitors. All this results in high torsional and flexural rigidity, which delivers superior stability and Zoom-Zoom handling - without making Mazda's flagship SUV unduly heavy.

Its McPherson strut front suspension uses a 6-point rubber mount perimeter frame. This gives strong support and a sharp, linear feel to its hydraulic power assist rack-and-pinion steering system. The multi-link rear suspension employs one trailing arm and two lateral locating members on each side, and a rear frame with two rubber mounts on each side. The connecting points of the trailing arms are placed higher than usual, which further improves their stability during braking. The link layout is optimised to provide consistent wheel alignment when external forces are acting on the rear suspension, for predictable handling.