PNEUMATIC TIRE

PROBLEM TO BE SOLVED: To obtain a pneumatic tire which excels in asymmetric abrasion resistance and lasts long in a steady state by providing a stepped land portion in a central range and both side ranges, while the stepped land portion of the central range has a larger step-down margin than that of the both side ranges. SOLUTION: A tread portion 1 has, in a central range Rc, a pair of circumferential center grooves 10, 11 which extend continuously in the circumferential direction with respect to a tread surface 1t, while having, in the both ranges Rs, pairs of circumferential shouldered grooves 12, 13 and 14, 15, respectively. In the tread portion 1, the central range Re has a stepped land portion 20, the surface of which is stepped down from the tread surface 1t, while the both side ranges Rs having stepped land portions 21, 22, the surface of which are stepped down from the tread surface It. A step-down margin of the stepped land portion 20 in the central range Rc is larger than that of the stepped land potions 21, 22 in both side ranges Rs. Thereby asymmetric abrasion resistance is improved and a tread rubber 7 can obtain a sufficiently longer life.