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GB/T 39970-2021 English PDF (GBT39970-2021)

GB/T 39970-2021 English PDF (GBT39970-2021)

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GB/T 39970-2021: Thresholds and grading of coast-by noise for motor vehicle tyres
This Standard specifies the thresholds and grading requirements and test methods for coast-by noise for motor vehicle tyres. This Standard is applicable to new vehicle radial tyres and new mini, light truck radial tyres and new truck radial tyres, excluding tyres with nominal rim diameter ??10 inches and nominal rim diameter ??25 inches, T-type spare tyres for temporary use only, special ST metric tyres for road trailers, high-passability radial tyres for light truck vehicle, heavy truck tyres with a speed capability of 80km/h (not included), racing tyres, studded tyres and professional off-road tyres.

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