| 摘要 |
<p>In a pneumatic tire (1) having at least two ribs (4) in a tread portion (2), one of these ribs is a basic rib (4a) constructed by arranging a plurality of basic pitch elements (6a) having the same pitch (Pa) in the circumferential direction of the tire, and any one of the remaining ribs is a chord rib (4b, 4c) constructed by arranging a plurality of chord pitch elements (6b, 6c) having the same pitch (Pb, Pc) in the circumferential direction. In this rib arrangement, the total number of chord pitch elements in the chord rib is a positive integer obtained by counting or emitting a product of a value of 2<n/12> (n: 1-24) and a total number of basic pitch elements in the basic rib, and pattern sound from the basic rib and the chord rib have a consonance relation, whereby the noise from the tire can be reduced.</p> |
