本文件规定了代号为农用拖拉机驱动轮轮胎的标记、尺寸、额定载荷和参考速度，并附有使用说明（载荷指数和速度符号）。 它适用于速度类别为40 km/h（速度符号A8）和50 km/h（速度符号B）的子午线结构轮胎。 附注代码指定系列: -ISO 4251规定了用于农业拖拉机和机器的斜交（帘布层等级标记）轮胎？1和ISO 4251？2; -ISO 18807[1]规定了伐木和林业机械用轮胎； -ISO 13442规定了建筑/工业拖拉机用轮胎。 [1]待公布。

This document specifies the marking, dimensions, load ratings and reference speeds for code-designated agricultural tractor drive-wheel tyres with service description (load index and speed symbol). It applies to tyres of radial construction in the speed categories 40 km/h (speed symbol A8), and 50 km/h (speed symbol B). NOTE Code designated series of: — diagonal (ply rating marked) tyres for agricultural tractors and machines are specified in ISO 4251？1 and ISO 4251？2; — tyres for logging and forestry machines are specified in ISO 18807^[1]; — tyres for construction/industrial tractors are specified in ISO 13442. ^[1] To be published.