Importance

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Abstract

Provided is a pneumatic tire with which measurement of the strength of a magnetic field, which changes with wear, can be carried out regularly with stability and sufficient detection sensitivity so that the wear state of the tire can be ascertained regularly with accuracy. In this pneumatic tire, in a tread part where a pattern of protrusions and recessed grooves has been formed, a recess of a prescribed shape is formed in one or more of the protrusions so as to extend radially inward from the ground contact surface. A soft magnetic body formed by dispersing a granular soft magnetic material in a polymer material is embedded in the recess. A magnet formed using a hard magnetic material is provided radially inward from the soft magnetic body. A magnetic circuit formed by the soft magnetic body and magnet forms a magnetic field having a prescribed strength in the thickness direction of the protrusion. A magnetic sensor for detecting the magnetic flux density of the magnetic field formed by the magnetic circuit is disposed at a radially inward position corresponding to the soft magnetic body.

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First Claim