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造成６．５０Ｒ１６８ＰＲ轻载子午线轮胎胎圈裂口的主要原因是轮胎结构设计不合理和使用不当。从结构设计上，应增大轮辋宽度及调整上下胎侧曲线等；从施工设计上，采用上下复合三角胶及用２层尼龙加强层替代原一层钢丝加强层等；从工艺设计上，调整成型工艺参数并相应调整成型压力参数等。改进后进行了成品试验。试验结果表明，改进后轮胎外缘尺寸符合国标，耐久性能提高１７０％，行驶里程延长１倍左右。
The main cause of the 6.50R168PR light duty radial tire bead tear is the unreasonable design and improper use of the tire structure. From the structural design, should increase the rim width and adjust the upper and lower sidewall curves, etc .; from the construction design, the upper and lower composite apex glue and two layers of nylon reinforcement to replace the original layer of steel wire reinforced layer; from the process design, adjust Forming process parameters and adjust the pressure parameters accordingly. After the improvement of the finished product test. The test results show that the improved tire rim size in line with the national standard, durability increased by 170%, driving mileage extended by about 1 times.