| 摘要 |
PROBLEM TO BE SOLVED: To expand a frequency range of a noise, and reduce a pattern noise to the maximum extent by lowering amplitude, by setting the length of an intermediate pitch among three kinds of basic pitches different in a length like a short pitch, an intermediate pitch and a long pitch in a specific range of the short pitch on a tire circumferential surface. SOLUTION: A single tread is formed on a tire circumferential surface by nonperiodically and repeatedly arranging these by constituting it of a short pitch S, an intermediate pitch M and a long pitch L. Among these basic pitches, a length of the intermediate pitch M is set to 1.05 to 1.20 times the short pitch S. Therefore, when a frequency range of a noise is expanded and amplitude is lowered, a pattern noise can be reduced to the maximum extent. Therefore, this tire can obtain a quieter automobile environment at traveling time of an automobile. |
