Pneumatic radial tire

摘要

A pneumatic radial tire including a carcass; two belt reinforcing layers; and a belt formed by two belt layers. A width of a belt cord intersecting region defined by the two belt layers is set in the range of 65 to 90% of the tire width-W, the maximum width of the belt reinforcing layer is set in the range of 60 to 85% of the tire width. Also, a belt radius ratio, which is a ratio of difference between the radius of the belt at the tire equatorial plane and the radius of the belt at a belt side end position thereof measured from the tire axis in a state where the tire is inflated at the standard inner pressure, with respect to a belt half width, is not larger than 0.06.

主权项

1. A pneumatic radial tire, comprising:
a carcass of a toroidal shape engagedly held between at least one pair of bead cores; at least one layer of belt reinforcing layer constituted of a reinforcing element extending in the tire circumferential direction, and provided on the outer side of a crown region of the carcass and on the inner side of a tread rubber; and a belt formed by at least two belt layers and provided on the outer side in the tire radial direction of the belt reinforcing layer, belt cords of one belt layer and those of another belt layer being inclined opposite to each other with respect to the tire equatorial plane, wherein the width of a belt cord intersecting region defined by the at least two belt layers is set in the range of greater than 80% and less than or equal to 90% of a tire width, the width of the belt reinforcing layer is set in the range of 60 to 85% of the tire width, and a belt radius ratio, which is a ratio of difference (R0−R1) between the radius (R0) of the belt at the tire equatorial plane and the radius (R1) of the belt at a belt side end position thereof measured from the tire axis in a state where the tire is inflated at the standard inner pressure, with respect to a belt half width, is not larger than 0.06, and wherein an outermost end, in the tire width direction, of a radially outermost belt layer is provided at a radial position that is not above a radial position of the radially outermost belt layer at the tire equatorial plane.