| 摘要 |
PURPOSE:To intend to improve durability in high speed by setting up a width of a belt layer in a specified ratio to the width about specified nodal points while setting up thickness of tread rubber at the maximum width end of the belt layer in a specified ratio to the thickness at the said nodal point. CONSTITUTION:A width between a pair of circular main channels 1, which divide a stepping portion of tread into side zones T1 and a central zone T2, namely width Tw2 of the central zone T2, is set up to 45-65 % of the maximum width Tw of a tire in a case if combined to regular rim and still filled with regular inner pressure. On the construction above, width Bw of a belt layer 6 is set up in a range of 110-130 % to a width Pw between nodal points P of an imaginary line 1, in tangential to wear indicators 2 and in parallel to the rotation axis of the tire, and a profile line of the tire on the side zone T1. And still, thickness d of tread rubber of the belt layer 6 at the maximum width end is set up in a range of 30-80 % to thickness c of tread rubber at the nodal point P. |
