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Automobile radial tyres in China have developed from scratch swiftly and violently, and the products have been sold over Europe and the United States. While the standard of the previous product series couldn’t adapt to the development scale of the automobile radial tyres any more, therefore, we especially revised the standard for product series of automobile radial tyres with reference to international advanced standard.
In this standard, some revisions have been made about the previous edition of GB/T 2978-89 on the basis of the equivalent application of European ETRTO-1994.
In this edition, there are alterations in the following sections and contents:
Representation of tyre specification equates with European standard.
The part of automobile oblique tyres is omitted.
Speed level T is added in the relation table between speed levels and maximum traveling speeds for tyres of different nominal diameters of wheel rim.
Speed level V, W, and Y are added in the table of tyre speed level and maximum traveling speed.
Specifications of “45” series, “50” series and “55” series of automobile radial tyres are added.
Products series are ranged according to section flattening of tyres (from high to low).
In the column of basic parameters, basically only the second gear is permitted to use wheel rim type.
Main dimensions and other parameters of tyre specifications have been revised properly according to ETRTO-1994.
A corresponding table between different pressure and load of automobile radial tyres is added.
This standard will replace GB/T 2978-89 simultaneously from the day it is effective as of.
Annex A of this standard is normative.
This standard was proposed by Ministry of Chemical Industry of PRC.
This standard is under the centralized management by National mittee on Tyre and Wheel Rim Standardization.
The drafting units of this standard: Beijing Rubber Industry Research Institute of Ministry of Chemical Industry, Liaoning Changzheng pany, Ltd. and Shanghai Zhengtai Rubber Plant.
The main draftsmen of this standard: Shen Jianrong, Chen Minling, Ou Yanling, Wang Kexian, Liu Shifang, Shan Jibao and Wang Jinlan.
This standard was firstly issued and revised respectively in March, 1982 and in March, 1989.
This standard is entrusted to National mittee on Tyre and Wheel Rim Standardization for explanation.
This standard prescribed the tyre specifications, basic parameters, main dimensions and the corrsponding relation between pressure and load.
This standard is applicable to automobile charging tyres.
The requirments, test method, inspection rules, marks and pachage of all tyres produced in conformity with this standard form to GB 9743 Product Standard.
2 Normative references
After being used in this standard, the clauses included in the following standards will e clauses of this standard. All editions are valid when the standard is published. As all