GB/T 39970-2021
ActiveThresholds and grading of coast-by noise for motor vehicle tyres
汽车轮胎惯性滑行通过噪声限值和等级
Application Summary AI generated
This standard specifies the noise limits and grading levels for coast-by noise generated by motor vehicle tyres during inertial coasting. It is applied in the testing and certification of tyres for passenger cars, light trucks, and heavy vehicles to control environmental noise pollution. The standard is used by tyre manufacturers, vehicle assemblers, and regulatory bodies in China to evaluate and classify tyre noise performance for type approval and market access.
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Transparency note: The application summary and key sentences on this page were automatically generated by AI from the standard's original text. This content has not been human-verified and should not be used for compliance or regulatory purposes. Always refer to the official standard document from the issuing authority.