Bridgestone Corporation

Toshiki Nagai

Massimo Mangia

A pneumatic tire, comprising: a carcass provided in a toroidal shape across a pair of bead cores; a bead filler provided on the outer side in the tire radial direction of each bead core; and a rim guard to protrude on the outer side in the tire width direction for rim protection, wherein a contour of a portion of the rim guard has radius of curvature in the range of 5 mm to 40 mm in a widthwise cross section of the tire, and provided that '1CSH' represents a distance in the tire radial direction between the innermost end and the outermost end of the carcass, a distance in the tire radial direction between the outermost end in the tire width direction of the rim guard and the outermost end in the tire radial direction of a bead filler is in the range of &#x2212;0.2CSH to 0.05CSH.

Pneumatic tire

A pneumatic tire, comprising at least sidewall portions and rim guards each provided at the corresponding sidewall portion, wherein: in a cross section in the width direction of the tire assembled with a prescribed rim, an outer contour line, of the rim guard, situated on the outer side in the tire radial direction than the radially outermost peak of the rim guard has an arcuate configuration of which the center of curvature is located on the external side of the tire; radius of curvature R of the outer contour line is in the range of 5 mm&#x2266;R&#x2266;40 mm; and provided that H represents a distance in the tire radial direction measured from the radially innermost peak to the outermost position in the tire radial direction of a rim flange, 2 mm&#x2266;H&#x2266;40 mm.

In the present invention, a carcass () of a pneumatic tire (A) comprises a toroidal-shaped carcass main body () and a carcass folded part () folded at a bead core (). A bead filler () is disposed outward of the bead core () in the tire radial direction. A rubber sheet () is disposed outward of the bead filler () in the tire radial direction. A space (DA) is formed between the tire radial direction outer side end () of the bead filler () and the tire radial direction inner side end () of the rubber sheet ().

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Tokyo, Japan

Toshiki Nagai