Patent ID: 9033010
Filing Date: 2015-05-19
Classification: B60C

Abstract:
1. A pneumatic tire in which: a carcass layer is laid between paired bead sections; a belt layer is buried, on the outer peripheral side of the carcass layer, in a tread section; and a plurality of main grooves extending in a tire circumferential direction, and a plurality of first lug grooves extending in a tire width direction are provided in the tread section, the pneumatic tire characterized in that: a maximum groove depth of each of the main grooves is 8.5 mm to 15.0 mm, each one of a central land portion of the tire and a pair of adjacent land portions is made up of a plurality of blocks having edges which face the main grooves and which are shaped like a straight line, wherein an inclination angle of each of said block edges to the tire circumferential direction is in a range of 3 to 10 degrees, a ratio α of an actual section height SH of an actual tire to a calculated section height SH a contact area ratio is 65% to 70% under a measurement condition where an air pressure is 200 kPa and a load is 50% of a load carrying ability with the air pressure of 200 kPa, a ratio β of a maximum contact width GCW of the tread section to a tire section width SW is in a range of 0.60≦β≦0.70, a maximum footprint length Ls of shoulder land portions in the footprint of the tire under the measurement condition, situated in respective shoulders of the tread section, and a maximum footprint length Lc of a center land portion in the footprint of the tire under the measurement condition situated in a center of the tread section satisfy a relationship of 0.80≦Ls/Lc≦0.90, the plurality of first lug grooves are formed in the shoulder land portions, wherein each of said first lug grooves extend at least a half inch or more from one footprint end toward a tread center; has a groove width of 1/16 inches or more; and has an inclination angle with respect to the tire circumferential direction in a range of 35 to 90 degrees, an average contact pressure P is 300 kPa to 400 kPa under the measurement condition, and an aspect ratio is in a range of 75% to 85%.