摘要 |
A pneumatic tire 10 , in which at least one rib groove 12 extended in a tire circumferential direction is formed on a tread surface portion T of a tread portion 11 , and portions 13 discontinuous in terms of rigidity are formed in a circumferential direction of rib lines B formed by the rib groove 12 , the discontinuous portions 13 causing variations of tire axle force. Rigidity changing portions 20 which cancel the variations of the tire axle force are provided in the rib groove 12 , the variations being caused by the discontinuous portions 13 . Thus, vibrational force to an axle is lowered, and pattern noise caused thereby is reduced effectively.
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