The strong aluminum backbone protects the bottom of the car from extreme conditions and abusive jumps. The aluminum backbone is perfectly fitted to the composite chassis frame and all holes are perfectly countersunk to provide a smooth surface.
The revolutionary and unique chassis design of the XB4 features XRAY Multi-Flex technology. The Swiss 7075 T6 aluminum backbone and composite chassis-plate are firmly mounted together to create a solid framework with each piece playing a distinctive role. The alu chassis provides the car with stability and stiffness, while allowing torsional flex along the lengthwise axis.
Due the nature of the aluminum material and the machining process, it is normal that the chassis may be slightly bent in the longitudinal direction.