Home / Standards / GB/T 39970-2021 GB/T 39970-2021 Active Thresholds 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 Standard Type GBT ICS 83.160.10 CCS G41 Status 现行 Issue Date 2021-05-21 Implementation 2021-12-01 Responsible Dept 中国石油和化学工业联合会 Drafting Unit N/A