PNEUMATIC TIRE FOR AUTOMOBILE

摘要

PROBLEM TO BE SOLVED: To provide a pneumatic tire for an automobile which is largely reduced in tire weight hand rolling resistance.SOLUTION: In a pneumatic tire in which a carcass layer 4 is bridged between a pair of bead parts 3, a reinforcing layer 8 is disposed on the tread part 1, and a tread rubber layer 9 is laminated on an external peripheral side of the reinforcing layer 8, a first region A is segmented between a pair of first boundary lines L1, L1, a second region B is segmented between the first boundary line L1 and a second boundary line L2, and a third region C is segmented to a bead toe 31 side rather than the second boundary line L2. When cross section areas (mm) of the regions are set as SA, SB and SC, and also when peripheral lengths (mm) along tire internal faces of the first region A to the third region C are set as a, b and c, relationships of 7.5≤SA/a≤11.5, 2.0≤SB/b≤6.0 are satisfied with respect to ratios of SA/a, SB/b, and the carcass layer 4 is divided in an arrangement region of the reinforcing layers 8, and the carcass layer 4 is constituted of a pair of divided pieces 4A, 4A which are separated to peripheral directions.