This standard specifies the tire specifications, basic parameters, main dimensions, and the corresponding relationship between air pressure and load. This standard applies to passenger car pneumatic tires.
GB/T 2978-1997 history
2014GB/T 2978-2014 Size designation, dimensions,inflation pressure and load capacity for passenger car tyres
2008GB/T 2978-2008 Size designation,dimensions,inflation pressure and load capacity for passenger car tyres