Patent ID: 9586444
Date: 2017-03-07
CPC Classifications: B60C

Claim:
1. A pneumatic tire comprising three or more circumferential main grooves in a tread portion, including outer circumferential main grooves disposed most on tread ground-contact end sides and at least one inner circumferential main groove adjacent to the outer circumferential main grooves axially inwardly in the tread portion, wherein inner land portions disposed between the inner and outer circumferential main grooves are divided into multiple circumferentially arranged inner blocks by multiple inner lateral grooves traversing the inner land portions, a groove centerline of the inner lateral grooves is inclined at an angle α of 10 to 40° with respect to an axial line, the inner lateral grooves include first inner lateral grooves and second inner lateral grooves which are alternately arranged in a circumferential direction, the first inner lateral grooves include: a ratio (L the second inner lateral grooves include: a groove depth of the second inner lateral grooves is almost constant over the entire length, a groove depth of the narrow-width part of the first inner lateral groove is smaller than a groove depth of the wide-width part of the first inner lateral groove.