Patent ID: 9415637
Filing Date: 2016-08-16
CPC Classification: B60C,Y02T

Claim Text:
1. A pneumatic tire, comprising: four or more circumferential main grooves extending in a tire circumferential direction; and five or more land portions partitioned by the circumferential main grooves, a center land portion is defined as the land portion disposed on a tire equatorial plane, or the land portion partitioned by the circumferential main groove disposed on the tire equational plane, the center land portion includes a plurality of lug grooves that pass through the center land portion in a tire width direction and is disposed at predetermined intervals in the tire circumferential direction, and a plurality of blocks partitioned by the plurality of lug grooves, the lug grooves including a first lug groove portion, and at least one second lug groove portion that opens into one of the circumferential main grooves, a groove width b of the first lug groove portion and a groove width B of the second lug groove portion having relationships of 2.0 mm≦b≦4.0 mm and b<B, and being within ranges such that upon ground contact of the blocks, the first lug groove portions are closed and the second lug groove portions are not closed but remain open, the first lug groove portion and the second lug groove portion are inclined in a same direction with respect to the tire width direction, an angle of inclination α of the first lug groove portion and an angle of inclination β of the second lug groove portion have a relationship of α>β, and a groove depth H1 of the circumferential main grooves is in the range of 12 mm≦H1.