| 摘要 |
PROBLEM TO BE SOLVED: To prevent a steel code reinforcing layer from being separated in a radial-directional outer end in an outside area, and to prevent a bead part from being rubbed with a rim. SOLUTION: This tire is provided with a radial carcass 3 arranged to be wound up from an inside to an outside in a periphery of a bead core 2 and comprising a steel code ply, a steel code reinforcing layer 4 arranged ranging over from a tire width-directional inside area to its outside area in a periphery of the bead core 2, a chafer rubber 5 arranged in a contact area contacting with the wheel rim, and a sidewall rubber 6 joined layeredly onto the chafer rubber 5. The radial-directional outer ends A, B of the tire in a portion existing respectively in the tire width-directional outside and inside areas of the reinforcing layer 4 are positioned respectively within 25-40 deg. and 50-70 deg. of angle ranges with respect to a horizontal line segment h passing through a curvature center O using as a reference the curvature center O of a rim flange RF in the rim R, under an attitude where air pressure is filled after assemble to the rim R, in a condition where 100% modulus of the chafer rubber 5 is brought into 02.8-5.0 MPa and where 100% modulus of the sidewall rubber 6 is brought into 1.5-2.7 MPa. |
