this International Standard specifies test methods for verifying the capabilities of truck and bus tyres. Of the test methods presented, only some may be required depending on the type of tyre to be tested. The tests are carried out in a laboratory under controlled conditions. lt includes a strength test for assessing the capability of the tyre structure, with respect to braking energy, in the tread area. A second test, the endurante test, assesses the resistance of the tyre with respect to Service at full load and moderate Speed over long distances. The test methods presented in this International Standard are not intended for gradation of tyre performante or quality levels. This International Standard applies to all truck and bus tyres.