| 摘要 |
PURPOSE:To provide sufficient durability at a higher speed as well as excellent turning performance by reducing a ratio of less tangents much more in a central region rubber layer of a tread part than in both side region rubber layers. CONSTITUTION:A tread part 5 located on a crown 4 of a carcass 3 is adapted to have its width exceeding the maximum width of a side wall 1, and the total gauge of the tread part 5 has its uniform wall thickness from the circumference of a central circle O-O to a side end position of the tread part 5. In particular, the tread part 5 has a central region rubber layer 6 and both side region rubber layers 7, 7 disposed on a central portion thereof widthwise thereof and joins both the rubber layers 6, 7 with each other, while it has a higher ratio tandelta/E' of a loss tangent to storage elastic modulus of both region rubber layers 7 than that of the central region rubber layer 6. Hereby, a weight of a two-wheeled vehicle in making a straight drive is substantially supported by the rubber layer 6 to raise durability of the tire at a higher speed. |
