These changes created several new challenges for the tyre manufacturers - most notably ensuring the grooves' integrity, which in turn limited the softness of rubber compounds that could be used.
In order to increase the dimensional accuracy and other properties of strip steel used for the tyre rim of bicycle, the experiments on rolling process and heat treatment are made.
本文为提高自行车钢圈用带钠的尺寸精度和各项性能进行了轧制和热处理工艺试验，得出了好的工艺制度。
3
Now when the game that was used every fifth year was kept at Tyre, the king being present.