ISO 13325:2003

Tyres — Coast-by methods for measurement of tyre-to-road sound emission

ISO 13325:2003 specifies methods for measuring tyre-road sound emissions from tyres fitted on a motor vehicle or towed trailer under coast-by conditions — i.e. when the vehicle or trailer is in free-rolling, non-powered operation, with transmission in the neutral position and the engine as well as all auxiliary systems not necessary for safe driving switched off.