Patent ID: 9174498
Filing Date: 2015-11-03
Classification: B60C,Y10T

Abstract:
1. A pneumatic tire, comprising a belt layer formed by laminating a pair of cross belts and a circumferential reinforcing layer, and a plurality of circumferential main grooves and a plurality of land portions partitioned by the circumferential main grooves in a tread portion, wherein a mark for determining the time for renewal of the tire is provided in a buttress portion, and, when the circumferential main groove that is on an outermost side in a tire width direction is referred to as an outermost circumferential main groove, and when viewed as a cross-section in a tire meridian direction, when a curved line L is drawn passing through a groove bottom of the outermost circumferential main groove parallel to a profile of the land portion from the outermost circumferential main groove to a tire ground contact edge, an intersection point of the curved line L and the profile of the buttress portion is A, the outermost circumferential main groove is to the outer side in the tire width direction of the circumferential reinforcing layer, a width Ws of the circumferential reinforcing layer relative to a tire developed width TDW is in ranges such that 0.65≦Ws/TDW≦0.80, the mark is a first mark shaped as a rib-shaped protrusion, the first mark extending in a tire circumferential direction, the buttress portion includes a second mark shaped as a groove-shaped recess, the second mark extending in the circumferential direction, the intersection point A is positioned between the first mark and the second mark, a groove bottom gauge t of the outermost circumferential main groove and a distance D from the intersection point A to the first mark in a tire radial direction have a relationship such that −1.0≦D/t≦1.0, taking the outer side in the tire radial direction to be positive, and the groove bottom gauge t of the outermost circumferential main groove and a distance D′ from the intersection point A to the second mark in the tire radial direction have a relationship such that −1.0≦D′/t≦1.0, taking the outer side in the tire radial direction to be positive.