What is ISO 13325– Coast-by method for tyres about?
ISO 13325 specifies methods for measuring tyre-to-road sound emissions from tyres fitted on a motor vehicle under coast-by conditions, i.e., when the vehicle is in free-rolling, non-powered operation. This is typically achieved by putting the transmission in the neutral or equivalent position and switching off the engine as well as all auxiliary systems not necessary for safe driving.
ISO 13325 is applicable to passenger cars and commercial vehicles as defined in ISO 3833. It is not intended to be used to determine the sound contribution of tyres of vehicles running in powered condition nor for the determination of traffic sound nuisance at a given location.
Who is ISO 13325– Coast-by method for tyres for?
ISO 13325 on tyres is relevant to:
- Manufacturers of tyres
- Mechanical Engineers
- Automobile industry
- Any entity responsible for testing and quality of tyres
Why should you use ISO 13325– Coast-by method for tyres?
Tyre-to-road sound is the sound produced when a vehicle's tyres rotate at a high speed.
ISO 13325 describes the methods for measuring the tyre-to-road sound emissions from tyres fitted to motor vehicles under coast-by conditions, i.e., when the vehicle is in free-rolling, nonpowered operation.
ISO 13325 is based on multiple tests conducted in controlled environments with motor vehicles in motion. The measurements shall be made from coast-by conditions. The results obtained give an objective measure of the sound emitted under the specified test conditions.
Overall, ISO 13325 is a comprehensive guide to provide methods for measuring the tyre to road sound emission, so users will gain a comprehensive understanding of the quality of tyres, durability and strength.
What’s changed since the last update?
BS ISO 13325:2019 supersedes BS ISO 13325:2003, which is withdrawn and includes the following technical changes:
- Test site description has been improved
- Preparation and adjustment depending of the tyre type has been improved
- Trailer method has been withdrawn
- Clarification of the formula for the determination of test result has been added
- Parameters and calculation method have been aligned with UN regulation 117