Pneumatic tire

摘要

A pneumatic tire comprises at least one sidewall portion provided with a serration pattern on its outer surface, the serration pattern comprising a plurality of first groups being repeatedly arranged in the circumferential direction of the tire, each first group comprising a plurality of ridges which are arranged using gradually increasing pitches toward a first circumferential direction of the tire, wherein a region provided with the serration pattern on the outer surface of the sidewall portion has a radius of curvature in a range of not more than 70 mm in a cross section including a tire axis under a standard condition such that the tire is mounted on a standard rim and inflated to a standard pressure, but no tire load is loaded.

主权项

1. A pneumatic tire comprising
a pair of sidewall portions, at least one of said sidewall portions provided with a serration pattern on its outer surface, said serration pattern comprising a plurality of radially extending ridges arranged in a circumferential direction of the tire, said serration pattern including a plurality of first groups repeatedly arranged in the circumferential direction of the tire, and said each first group formed with a plurality of ridges, wherein at least three pitches defined between directly adjacent ridges are present within said first group and said pitches are different from one another so as to increase gradually toward a first circumferential direction of the tire, and wherein a region provided with said serration pattern on said outer surface of the sidewall portion has a radius of curvature in a range of not more than 70 mm in a cross section including a tire axis under a standard condition such that the tire is mounted on a standard rim and inflated to a standard pressure, but no tire load is loaded.