TIRE HAVING TREAD GROOVES

A tire comprises a tread portion provided with grooves. When the tire mounted on a standard wheel rim and inflated to a standard tire pressure is placed on a flat surface at a camber angle of zero and loaded with a standard tire load, the tire has a ground contacting patch. The depths of the respective grooves, and ground contact lengths of the ground contacting patch measured at axial positions of the respective grooves, are in a relationship in which the groove depth increases or decreases as the ground contact length increases or decreases.