Pneumatic tire for motor vehicles

A pneumatic tire for high speed motor vehicles upon hard road surfacing, which has a circumferential tread surface with a circumferential central section, said tread surface to protect against danger of hydroplaning being provided with grooves therein extending from said central section toward both sides of said tread surface and said grooves being curved along structural curvature of a parabola of the second order and being provided instantaneously to eliminate water effectively from said tread surface, the structural curvature of said grooves being determined mathematically by a functional equation x = y.sup.2 x constant, in which x is the coordinate extending in the axial direction of said tire, and in which y is the coordinate extending in the circumferential direction of said tire.