| 摘要 |
A method of designing a tire designs a tire comprising a step 20 of determining a resonance sound frequency f being a reference frequency of an air column resonance sound produced by the tire, on the basis of a ground contact length of the tire in a case where a standard internal pressure and a standard load are applied to the tire, a step 30 of determining the number of pitches of the block row, and a step 40 of determining a block row phase in a case where a band of a secondary pitch noise frequency fp2 falls within a range overlapping with a band of the resonance sound frequency f, the block row phase defined by intervals at which the plurality of blocks forming the block row are placed, the secondary pitch noise frequency fp2 being a secondary component of a reference frequency of pitch noise arising from the block row at a reference speed being a reference traveling speed of a vehicle equipped with the tire. In the step 40, the block row phase is determined in such a manner that one part and the other part of the block row on both sides of a tire equator line are out of phase from each other by 10% to 30%.
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