GB/T 2978-2024 English PDF (GBT2978-2024)

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GB/T 2978-2024: Size designation, dimensions, inflation pressure and load capacity for passenger car tyres
GB/T 2978-2024
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 83.160.10
CCS G 41
Replacing GB/T 2978-2014
Size designation, dimensions, inflation pressure and load
capacity for passenger car tyres
ISSUED ON: SEPTEMBER 29, 2024
IMPLEMENTED ON: APRIL 1, 2025
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 4
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 6
4 Indication of tyre sizes ... 6
5 Tyre sizes, dimensions, inflation pressure and load capacity ... 7
6 Valve ... 47
Appendix A (Normative) Correspondence between load index and load capacity
... 49
Appendix B (Normative) Correspondence between speed symbols and
maximum driving speeds ... 50
Appendix C (Normative) Calculation and rounding regulations of maximum and
minimum peripheral dimensions of new tyres ... 51
Table 1 -- 80 series passenger car radial tyres ... 9
Table 2 -- 75 series passenger car radial tyres ... 11
Table 3 -- 70 series passenger car radial tyres ... 12
Table 4 -- 65 series passenger car radial tyres ... 14
Table 5 -- 60 series passenger car radial tyres ... 16
Table 6 -- 55 series passenger car radial tyres ... 19
Table 7 -- 50 series passenger car radial tyres ... 21
Table 8 -- 45 series passenger car radial tyres ... 24
Table 9 -- 40 series passenger car radial tyres ... 27
Table 10 -- 35 series passenger car radial tyres ... 29
Table 11 -- 30 series passenger car radial tyres ... 32
Table 12 -- 25 series passenger car radial tyres ... 35
Table 13 -- High load (HLa) passenger car radial tyres ... 37
Table 14 -- T-type temporary-use spare tyres ... 38
Table 15 -- Reserved old series of passenger car radial tyres a ... 42
Table 16 -- Correspondence between load capacity and inflation pressure of
standard passenger car radial tyres ... 42
Size designation, dimensions, inflation pressure and load
capacity for passenger car tyres
1 Scope
This document specifies the method of expressing passenger car tyre sizes, tyre sizes
and corresponding dimensions, inflation pressure and load capacity, as well as related
requirements.
This document applies to new pneumatic passenger car tyres.
2 Normative references
The provisions of the following documents constitute the essential clauses of this
document through normative references in this text. Among them, for referenced
documents with dates, only the versions corresponding to the dates are applicable to
this document; for referenced documents without dates, the latest versions (including
all amendments) are applicable to this document.
GB/T 6326 Tyre - Vocabulary
GB/T 30196-2022 Self-supporting run flat tyres
3 Terms and definitions
The terms and definitions defined in GB/T 6326 apply to this document.
4 Indication of tyre sizes
The following is an example of the size of a passenger car tyre:
measuring rim and new tyre dimension of passenger car tyres shall comply with the
provisions of Table 1~Table 15; the maximum use size, static loaded radius, rolling
radius and permitted rim of tyres should comply with the provisions of Table 1~Table
15.
5.2 When the driving speed is 160 km/h or below, the corresponding relationship
between the load capacity of standard and reinforced passenger car radial tyres at
different inflation pressures shall comply with the provisions of Table 16 and Table 17,
respectively.
5.3 The corresponding relationship between load index and load capacity shall comply
with the provisions of Appendix A.
5.4 The correspondence between speed symbols and maximum driving speeds shall
comply with the provisions of Appendix B.
5.5 The inflation pressure mentioned in this document refers to the inflation pressure of
the tyre at normal temperature and cold state, and does not include the increased
pressure caused by temperature rise during driving.
In any case, to ensure safety, the inflation pressure of the T-type temporary-use spare
tyre is 420 kPa, and the inflation pressure of other passenger car radial tyres shall not
be greater than 350 kPa.
Under normal use, the inflation pressure of high-load tyres shall not be lower than 200
kPa at any speed. The inflation pressure of other passenger car radial tyres shall not be
lower than 140 kPa when the driving speed is ≤160 km/h, and shall not be lower than
180 kPa when the driving speed is >160 km/h. In special use cases, please consult with
the tyre manufacturer.
Appendix C
(Normative)
Calculation and rounding regulations of maximum and
minimum peripheral dimensions of new tyres
C.1 Maximum and minimum overall width of a new tyre
The maximum and minimum overall widths of a passenger car tyre shall be calculated
according to the formulas specified in Table 1 and Table 14, and the results shall be
rounded off to the nearest integer in millimeters.
C.2 Maximum and minimum overall diameter of a new tyre
To calculate the maximum and minimum overall diameters of a passenger car tyre, first
round off the calculation result of the new tyre design section height to the nearest
integer millimeter, then round off the calculation result of "new tyre design section
height × coefficient" to the nearest integer millimeter, and calculate according to the
formulas specified in Table 1 and Table 14.
For snow tyres, mud and snow tyres and special use tyres, the maximum overall
diameter of a new tyre and the maximum overall diameter in service can be increased
by 1%, and the calculated results shall be rounded off to the nearest integer in
millimeters.
The design section height of a new tyre is calculated according to formula (C.1):
where:
H -- design section height of a new tyre, in millimeters (mm);
D -- design overall diameter of a new tyre, in millimeters (mm);
Dr -- nominal rim diameter, in millimeters (mm).
The design section height of a new tyre can also be calculated according to formula
(C.2):
where: