To provide a pneumatic tire with enhanced steering stability and braking property by reducing the rolling resistance.
In the tire profile fitted to a standard rim with the internal pressure being 230 kPa, a first arc of the radius of curvature TRa, a second arc of the radius of curvature TRb, and a third arc of the radius of curvature TRc are formed on the tread ground contact width TW from the side A to the side B when applying the load of 130% thereto so that the distance Dtc in the axial direction from the tread center P0 to the shifting point P1 of the first arc and the second arc satisfies the inequality Dtc/TW≤0.15; the distance Da in the axial direction from the point P1 to the ground contact end P3 on the side B and the distance Db in the axial direction to the shifting point P2 of the second arc and the third arc satisfies inequalities 0.45 ≤Db/Da≤0.75; the angle α formed by the line L1 in the axial direction passing through the point P1 and the line L2 passing through the points P1 and P2 is set to be 8-12°; the angle β formed by the line L3 passing through the point P2 and the ground contact end position P3 on the side B and the line L2 is set to be 2-6°; and the angle γ formed by the line L4 passing through the point P1 and the ground contact end position P4 on the side A and the line L1 is set to be 5-9°; and the inequalities α>γ>β are satisfied.
COPYRIGHT: (C)2007,JPO&INPIT
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Takashi Noguchi
Kazuhiko Saishita