| 摘要 |
A pneumatic tire comprising a tread portion having tread elements each provided with a sipe, wherein the sipe is open to a upper surface of the tread element, and has an open top end including a zigzag part and a bottom, wherein the sipe comprises: a first portion in which the zigzag part of the open top end extends to a side of the bottom in a state of being inclined to one side of a longitudinal direction of the sipe; a second portion connected to an inner side in a radial direction of the first portion, and in which the zigzag part extends to the side of the bottom in a state of being inclined in an opposite direction to the first portion; and a third portion connected to an inner side in a radial direction of the second portion, and in which the zigzag part extends to the side of the bottom in a state of being inclined in an opposite direction to the second portion, and the sipe satisfies the following relation (1): <?in-line-formulae description="In-line Formulae" end="lead"?>alpha1>alpha2>alpha3 (1)<?in-line-formulae description="In-line Formulae" end="tail"?> where alpha1 is a ratio (a1/h1) between a displacement length a1 of the first portion and a length h1 in a radial direction of the first portion, alpha2 is a ratio (a2/h2) between a displacement length a2 of the second portion direction and a length h2 in a radial direction of the second portion, and alpha3 is a ratio (a3/h3) between a displacement length a3 of the third portion and a length h3 in a radial direction of the third portion.
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