Patent ID: 9469161
Filing Date: 2016-10-18
CPC Classification: B60C

Claim Text:
1. A pneumatic tire for heavy load comprising: a tread, at least two circumferential grooves extending continuously in a tread circumferential direction, a plurality of transverse grooves opening to the circumferential grooves adjacent each other in a tread width direction, and a block defined by the circumferential grooves and the transverse grooves on a surface of the tread, wherein: the block is provided with at least three shallow grooves having an average groove depth shallower than a groove depth of the circumferential grooves adjacent to the block, the average groove depth is greater than 20% and less than 80% of the groove depth of the circumferential grooves adjacent to the blocks, the shallow grooves include a circumferential shallow groove and a width direction shallow groove, which open to other grooves at both ends, at least two of the shallow grooves open to at least one of the transverse grooves and the circumferential grooves adjacent to the block at both ends, and at least one of the shallow grooves opens to the at least two shallow grooves.