| 摘要 |
A profile design structure for improving durability of a tire is provided to improve endurance of the tire, and to decrease the weight of the tire by doubly designing the radius of an upper side wall. A profile design structure of a tire has a tread radius of a tread(12), an upper side wall radius of a side wall(10) connected by a tread width point of the tread radius, and a lower side wall radius connected to the upper side wall radius by a section width point. The profile of the upper side wall radius is designed with the first upper side wall radius and the second side wall radius. The first upper side wall radius is contacted to the second upper side wall radius through the tread width point and designed to be 350 % against the radius of a carcass. The second upper side wall radius is contacted to a vertical line at the section width point, and designed to be 115 % against the radius of the carcass. The first upper side wall radius is formed by multiplying the carcass radius by 350Œ50 %, and the second upper side wall radius is formed by multiplying the carcass radius by 115Œ15 %.
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