ISO 9112:2008规定了两种方法，用于在载重条件下测量卡车和公共汽车上使用的新型商用车轮胎的滚动周长和每单位距离（千米）的转数。 第一种方法是转鼓法，包括将安装在自由轴上的试验轮胎加载到指定直径的从动车轮（或转鼓）上。第二种方法涉及一辆车辆，其驱动轴配备了在笔直的铺面道路上行驶的测试轮胎。由此获得的值不适用于性能或质量水平。 ISO 9112:2008适用于所有卡车和公共汽车轮胎。

ISO 9112:2008 specifies two methods for measuring the rolling circumference and the number of revolutions per unit distance (kilometre) of new commercial vehicle tyres, under loaded conditions, for use on trucks and buses. The first method is a drum method consisting of loading a test tyre mounted on a free axle against a driven road wheel (or drum) of specified diameter. The second method involves a vehicle whose drive axle is equipped with the test tyres driven on a straight, paved road. The values thus obtained are not intended for use as levels of performance or quality. ISO 9112:2008 applies to all truck and bus tyres.