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提供一种通过防止位于胎圈部的胎体帘布层反包端部脱层来提高胎圈部耐久性的高载荷充气子午线轮胎。钢丝胎体帘布层20的端部反包钢丝圈10,同时在胎体帘布层20的反包部外侧配置钢丝帘线补强层30,该补强层30的外侧端部比轮辋轮缘的高度高且比胎体帘布层反包端部B低。在该补强层30的外侧配置有有机纤维补强层40。规定从钢丝圈最外端A到胎圈部外表面的厚度f与胎圈部总厚度g之比f/g为0.05～0.4,从钢丝圈最外端A到胎体帘布层反包端B的距离b与从钢丝圈最外端A到标准载荷、标准内压下胎圈部Z的轮辋轮缘接触端P的距离a之比b/a为1.5～2.0。
A high load pneumatic radial tire is provided that improves the durability of the bead portion by preventing delamination of the carcass ply turnup end located at the bead portion. The end portion of the steel carcass ply 20 is turned over to turn over the traveler 10 and the steel cord reinforcing layer 30 is disposed outside the turnup portion of the carcass ply 20 with the outer end of the reinforcing cord 30 High and lower than the turn-up end B of the carcass ply. An organic fiber reinforcing layer 40 is disposed outside the reinforcing layer 30. The ratio f / g of the thickness f from the outermost end A of the traveler to the outer surface of the bead portion g to the total thickness g of the bead portion is set to 0.05 to 0.4 from the outermost end A of the traveler to the turn-up end B of the carcass ply And the distance b / a from the outermost end A of the traveler to the standard load and the distance a between the rim rim contact end P of the bead portion Z under standard internal pressure is 1.5 to 2.0.