Patent ID: 9254718
Filing Date: 2016-02-09
CPC Classification: B60C

Claim Text:
1. A pneumatic radial tire having a tire axis, a tire width direction parallel to the tire axis, a circumferential direction running along a circle or an arc centered on the tire axis, an inner radius height that is a height from the tire axis and is tantamount to a maximum inner radius of the tire about the tire axis, and a maximum width position having a maximum outer width in the tire width direction when projections on outer face of the tire are excluded, comprising: a pair of bead parts; a pair of side wall parts each extending from one of the bead parts to a respective side wall outer edge in a radial direction; a tread part connecting both side wall outer edges of the side wall parts and having a grounding edge region adjacent to the side wall outer edge; a carcass ply extending through the side wall part from the tread part and locked by the bead part; three or less steel belt layers arranged at outer circumferential side of the carcass ply in the tread part; first and second blocks alternately arranged in the circumferential direction in the grounding edge region of the tread part, the second blocks having outer end faces arranged at outside, in the tire width direction, of respective outer faces of the first blocks; an annular region extending over the entire circumference in the circumferential direction on an outer surface of the side wall part and having a plurality of projections that are arranged side by side in the circumferential direction, the annular region being arranged at outside of the maximum width position, in the radial direction; an outer thin wall part continuing in the circumferential direction along an outer circumferential edge of the annular region, the outer thin wall part being arranged in vicinity of the inner radius height and inside of the inner radius height; and an inner thin wall part continuing in the circumferential direction along an inner circumferential edge of the annular region, wherein the outer thin wall part is an annular part where an average wall thickness in the tire circumferential direction is smaller than that of parts adjacent to an inner circumferential side and an outer circumferential side of the outer thin wall part, and the inner thin wall part is an annular part where an average wall thickness in the tire circumferential direction is smaller than that of parts adjacent to an inner circumferential side and an outer circumferential side of the inner thin wall part.