| 摘要 |
At a portion of an inclined main groove from a tread center to an auxiliary groove of a pneumatic tire, an angle of inclination &thetas;1 of a groove wall surface at a block step-in end side is set to be smaller than an angle of inclination &thetas;2 of a groove wall surface at a block kick-out end side. Therefore, rigidity of step-in ends of blocks defined by inclined main grooves is lowered such that a striking sound can be reduced. Further, at a portion of the inclined main groove from the auxiliary groove to a tread end, an angle of inclination &thetas;1 of a groove wall surface at a block step-in end side is set to be greater than an angle of inclination &thetas;2 of a groove wall surface at a block kick-out end side. Therefore, rigidity of kick-out end sides of blocks defined by the inclined main grooves is lowered. Heel-and-toe wear which occurs at the kick-out end sides is suppressed, and an increase in pattern noise caused by heel-and-toe wear is suppressed. <IMAGE>
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