Bargeboard (aerodynamics)

Bargeboards are pieces of bodywork on open-wheel racing cars, serving a purely aerodynamic (as opposed to structural) function. They are curved vertical planes situated longitudinally, between the front wheels and the sidepods, held away from the chassis at the front on struts or other connectors, and connecting to the sidepods or extensions of the floor at the rear. In general, they are significantly taller at the front than at the rear making them trapezoidal in profile, and they curve outward in plan view, being closer to the centerline of the car at the front, and curving out towards the rear.