Pneumatic tire with excellent ride feeling

Claim 1

A passenger car pneumatic tire giving excellent ride feeling, wherein a tread is reinforced by a belt consisting of plural metal cord layers piled so that the cores in one metal cord layer are intersected with those of a juxtaposed metal cord layer; the following relations are met: -1.5≦[(S/So)-1]×100≦-0.1 in which S is the maximum tire width in the state that the tire is fitted to a normal rim while being filled with air at an internal pressure of 1.7 kg/cm 2 and So is the tire maximum width after being mounted onto a rim but prior to the air pressure being applied to the tire; 0.70≦R/S≦0.75 in which R and S are a width between beads and the maximum tire width, respectively, of an inflated tire; a center portion of the tread does not vary in a radial direction between before and after said internal pressure being applied to the tire; and the tire from near the shoulder portion to the buttress portion outwardly swells when the internal pressure is applied to the tire.