Pneumatic radial tires with zigzag belt and rubberized cord ply belt reinforcing layer

Claim 1

A pneumatic radial tire comprising a radial carcass toroidally extending between a pair of bead cores, a belt superimposed about the carcass, a belt reinforcing layer laid on the belt and a tread laid thereon, the belt formed by zigzag and continuously extending a rubberized strip containing one or more cords therein substantially in a circumferential direction of the tread to slantly extend with respect to an equatorial plane of the tire from one end to the other end at both side edges of the belt through an axially bent state at each side edge, and the belt reinforcing layer is comprised of at least one rubberized cord ply containing plural cords slantly arranged with respect to the equatorial plane in a region corresponding to at least each side region of the tread, and the belt and the belt reinforcing layer satisfy a relationship that a distance from an intersection point between a normal line of a rotational axis of the tire passing through an outermost widthwise end of the belt and an outer surface of the tread to a position of maximum tire diameter is not more than 65% of a distance from an intersection point between a normal line of a rotational axis of the tire passing through an outermost widthwise end of the belt reinforcing layer and an outer surface of the tread to a position of maximum tire diameter.