21/30405164 DC

This standard 21/30405164 DC BS ISO 20908. Tyre sound emission test. Methods of drum is classified in these ICS categories:

• 17.140.30 Noise emitted by means of transport
• 83.160.10 Road vehicle tyres

This document specifies methods for measuring tyre-to-road sound emissions from tyres fitted on rig applying the tyre on a rotating drum under coast-by conditions — i.e. when the tyre is in free-rolling, non-powered operation.

The specifications are intended to achieve a correlation between results of testing the exterior noise of tyres in a semi anechoic chamber and outdoor testing as described in ISO 13325.

This document is applicable to passenger cars and light commercial vehicles tyres of class C1 and C2, as defined in ISO 3833. It is not intended to be used to determine the sound contribution of tyres applying a torque, nor for the determination of traffic sound nuisance at a given location.