GB/T 6326-2023 English PDF (GBT6326-2023)

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GB/T 6326-2023: Tyre -- Vocabulary
GB/T 6326-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.160.01
CCS G 41
Replacing GB/T 6326-2014
Tyre - Vocabulary
ISSUED ON: DECEMBER 28, 2023
IMPLEMENTED ON: JULY 01, 2024
Issued by: State Administration for Market Regulation.
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 General terms ... 6
4 Tyre classification ... 8
5 Tyre parts and components ... 16
6 Tyre tread pattern ... 21
7 Rims ... 23
8 Tyre size ... 25
9 Tyre performance and testing ... 29
10 Tyre marking ... 52
11 Tyre appearance defects ... 58
12 Tyre use ... 64
13 Tyre retreading and repair ... 72
Appendix A (Informative) Nominal diameter of rim ... 76
Appendix B (Informative) Correspondence between speed symbols and speed
capabilities ... 77
Appendix C (Informative) Correspondence between load index and load capacity ... 78
Index of English terms ... 79
Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020
"Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents".
This document replaces GB/T 6326-2014 "Tyre terms and definitions". Compared with
GB/T 6326-2014, in addition to structural adjustments and editorial changes, the main
technical changes are as follows:
a) CHANGE the definitions of the terms "special use tyre", "motorcycle tyre",
"moped tyre", "sidewall" (see 4.1.2, 4.3.9, 4.3.10, 5.3; 3.1.2, 3.3.9, 3.3.10, 4.3 of
2014 edition);
b) ADD the terms "traction tyre", "professional off-road tyre", "ice tyre", "rail transit
tyre", "straddle monorail tyre", "self-sealing tyre", "rim protector" (see 4.1.3,
4.1.4, 4.1.9, 4.3.13, 4.3.14, 4.4.33, 5.4);
c) DELETE the terms "slush pattern", "snow pattern", "new tyre size", "traction
resistance", "separation method measurement value", "machine method
measurement value", "separation method", "moment of inertia", "measurement
result correlation", "laboratory control tyre", "repeatability of measurement
results", "corrected tyre deviation", "correction value", "rated takeoff speed",
"rated landing speed", "rated takeoff load", "rated landing load", "incline test"
(see 5.10, 5.11, 7.2, 8.12.3, 8.12.7, 8.12.8, 8.12.11 ~ 8.12.13, 8.12.19 ~ 8.12.22,
8.18.11, 8.18.13, 8.18.15, 8.18. 17, 8.18.21 of the 2014 edition);
d) ADD the terms "vertical load", "ice grip index", "tractive force first harmonic",
"laser shearography testing", "robustness factor" and "impact bulge energy" (see
9.2.1, 9.8.31, 9.11.11, 9.16.4, 9.19.1, 9.19.2);
e) CHANGE the term "high-speed test" to "high speed performance test", "wet grip
coefficient" to "wet grip index", "snow grip coefficient" to "snow grip index",
"radial force" to "vertical force", "transverse force" to "lateral force", "lateral
displacement" to "lateral deflection", "lateral rigidity" to "lateral stiffness";
meanwhile CHANGE the definitions (see 9.7.1, 9.8.29, 9.8.30, 9.17.1, 9.17.5 ~
9.17.7; 8.6.1, 8.7.29, 8.7.30, 8.16.1, 8.16.5 ~ 8.16.7 of the 2014 edition);
f) CHANGE the definitions of the terms "takeoff speed", "landing speed", "takeoff
load", "landing load" (see 9.20.10 ~ 9.20.13; 8.18.10, 8.18.12, 8.18.14, 8.18.16
of the 2014 edition);
g) ADD the terms "bead ledge taper" and "load symbol" (see 9.20.22, 12.1.4);
h) CHANGE the definitions of the sign terms "F" and "POR" (see 10.3.5, 10.3.16;
9.3.17, 9.3.21 of the 2014 edition);
Tyre - Vocabulary
1 Scope
This document defines terminology used in the tyre industry, including general terms
and tyre classifications, tyre parts and components, tyre tread patterns, rims, tyre sizes,
tyre performance and testing, tyre marking, tyre appearance defects, tyre use, tyre
retreading and repair terms and their definitions.
This document applies to passenger car tyre, light truck tyre, truck and bus tyre, earth-
mover tyre, agricultural tyre, industrial tyre, motorcycle tyre, electric bicycle tyre, cycle
tyre, aircraft tyre.
2 Normative references
This document has no normative references.
3 General terms
3.1
Tyre
A circular elastic product mounted on a wheel or machine wheel.
3.2
New tyre
Tyre that are neither used nor retreaded.
3.3
Grown tyre
Tyre whose rim size has expanded due to use.
3.4
Pneumatic tyre
The tyre, whose inner cavity of the tyre needs to be filled with compressed gas or
liquid and can maintain the pressure.
Note: Divided into tube tyre and tubeless tyre.
3.5
Solid tyre
Cavity-less tyre that use materials with different properties to fill the tyre carcass.
3.6
Tubeless tyre
Pneumatic tyre that do not require an inner tube.
3.7
Tube tyre
A pneumatic tyre that requires an inner tube inside the tyre casing.
Note: Usually includes cover, inner tube, flap.
3.8
Cover
A tyre casing that can withstand various forces.
3.9
Inner tube
A circular elastic tube, which has a valve used to maintain the internal pressure of
the tyre.
3.10
Flap
An annular band that protects the inner tube contact patch from rim wear.
3.11
Rim
The part of the wheel that mounts and supports the tyre.
4 Tyre classification
4.1 Classification by use
4.1.1
Normal tyre
Tyre designed for general use.
4.1.2
Special use tyre
Tyre designed mainly for use under off-road conditions, which can be used on mixed
ordinary roads and off-roads, OR used under other special conditions.
Note: This type of tyre marking includes MPT (multi-purpose truck), ML (mining and
logging), ET (extra tread), POR (professional off-road), MT (mud-terrain), RT (rugged-
terrain), AT (all-terrain), etc.
4.1.3
Traction tyre
Tyre designed mainly for vehicle drive wheels, to maximize the transmission of
vehicle power.
4.1.4
Professional off-road tyre
Tyre designed primarily for use in harsh off-road conditions.
Note: It is a kind of special purpose tyre.
4.1.5
Mud and snow tyre
The tyre, whose tyre pattern, tread compound, tyre structure are specially designed
to provide better driving performance than ordinary tyre when driving in snowy,
muddy or sandy areas.
4.1.6
Temporary-use spare tyre
The tyres, other than those installed on vehicles and used under specified driving
conditions, are only used temporarily under limited driving conditions.
4.1.7
T-type temporary use spare tyre
The tyre, whose inflation pressure is higher than that of standard and reinforced tyre,
is for temporary use only.
4.1.8
Snow tyre
Tyre which has specially designed tyre patterns, tread compounds or tyre structures
that perform better than ordinary tyre, in terms of vehicle starting, handling and
braking performance on icy and snowy roads or in cold conditions.
4.1.9
Ice tyre
Tyre which has specially designed tyre patterns, tread compounds or tyre structures
that perform better than ordinary tyre, in terms of vehicle starting, handling and
braking performance on icy road conditions.
Note: It is a kind of snow tyre.
4.1.10
Run flat tyre
Pneumatic tyres that are designed to travel under normal inflation conditions and
can still travel a certain distance at a certain speed, under a lack of pressure condition.
4.1.11
Self-supporting run flat tyre
It is a pneumatic tyre, which is designed to be driven in a normal inflated state and
can still travel a certain d...