Series of Motorcycle Tyres

Transcription

1 GB/T Translated English of Chinese Standard: GB/T Translated by: Wayne Zheng et al. ICS G 41 NATIONAL STANDARD OF THE PEOPLE S REPUBLIC OF CHINA Series of Motorcycle Tyres 摩托车轮胎系列 GB/T Replacing GB/T (ISO :1985, Motorcycle Tyres and Rims (Code-designated Series) - Part 1:Tyre; ISO :199, Motorcycle Tyres and Rims (Code-designated Series) - Part 2: Tyre Load Ratings; ISO :24, Motorcycle Tyres and Rims (Code-designated series) - Part 3: Rims; ISO :24, Motorcycle Tyres and Rims (Metric Series) - Part 1: Design Guides; ISO :24, Motorcycle Tyres and Rims (Metric Series) - Part 2: Tyre Dimensions and Load-carrying Capacities, ISO :24, Motorcycle Tyres and Rims (Metric Series) - Part 3: Range of Permitted rim contours; ISO :1982, Moped Tyres and Rims - Part 1: Tyres; ISO 654-1:1994, Motorcycle Tyres and Rims (Code-designated Series) - Diameter Codes 4 to 12 - Part 1:Tyres, NEQ) Issued on: June 18, 28 Implemented on: February 1, 29 Issued by: The General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of the People's Republic of China Page 1 of 29

2 GB/T Table of Contents Foreword Scope Normative References Terms and Definitions Classification Designation Method of Specifications Mark and Its Additional Marks Specifications, Dimensions, Pneumatic Pressures, Loads and Rims... 7 Appendix A (Informative) Tread Types of Motorcycle Tyres of Metric Series Appendix B (Normative) Features of Tyre Service Conditions Page 2 of 29

3 GB/T Foreword The consistent degree of this Standard to the following standards is "not equivalent": ISO :1985, "Motorcycle Tyres and Rims (Code-designated Series) - Part 1:Tyre"; ISO :199, "Motorcycle Tyres and Rims (Code-designated Series) - Part 2: Tyre Load Ratings"; ISO :24, "Motorcycle Tyres and Rims (Code-designated series) - Part 3: Rims"; ISO :24, "Motorcycle Tyres and Rims (Metric Series) - Part 1: Design Guides"; ISO :24, "Motorcycle Tyres and Rims (Metric Series) - Part 2: Tyre Dimensions and Load-carrying Capacities", ISO :24, "Motorcycle Tyres and Rims (Metric Series) - Part 3: Range of Permitted rim contours"; ISO :1982, "Moped Tyres and Rims - Part 1: Tyres"; ISO 654-1:1994,"Motorcycle Tyres and Rims (Code-designated Series) - Diameter Codes 4 to 12 - Part 1:Tyres", JIS D , "Motorcycle Tyres - Designation and Dimensions", and ETR-TOEDI-26, "The European Tyre and Rim Technical Organisation - Engineering Design Information". This Standard replaces GB/T , "Series of Motorcycle Tyres" The main differences between this Standard and GB/T are: The explanations for ply ratings, speed symbols and load indexes are added in the example for the specifications marking of motorcycle tyres in the code-designated series (3.1.1 of 1997 edition and 5.1 of this edition); Specifications for some of the reinforced and weighted motorcycle tyres in the code-designated series as well as those for low sections 4.1 and 4.6 are added (Tables 1 and 1 of 1997 edition and Tables 1 and 2 of this edition); The small-wheel-diameter series in the former standard has been included into the code-designated series (Table 1 of 1997 edition and Table 2 of this edition); The designation method for specifications of tyres of metric series in difference structures (bias-ply tyres, bias-belted tyres and radial tyres) and with different speeds are added (3.2.1 of 1997 edition and 5.2 of this edition); Some of the permitted rims specified in the requirements of permitted rim contours for motorcycle tyres in code-designated series are modified (Table 2 of 1997 edition and Table 3 of this edition); The specifications of metric tyres of the 1, 9, 8, 7, 6, 55 and 5 series are supplemented with those for the motorcycle tyres of 65 and 4 series with the nominal rim diameter being greater than or equal to 13 and for the motorcycle tyres of 7 and 6 series with such diameter being less than or equal to 12 (Tables 3 and 4 of 1997 edition and Tables 5, 6 and 7 of this edition); The maximum overall width of section in service of bias belted tyres and radial tyres are added (Table 3 of 1997 edition and Tables 5 and 6 of this edition); The explanations that the bracketed rims in the tables of permitted rim contours are applicable only to the motorcycle tyres with bias-ply and bias-belted structures are added, and some of the permitted rims are modified (Table 5 of 1997 edition and Table 8 of this edition); The inflation pressures, load indexes and corresponding load capacity values for Page 3 of 29

4 GB/T high-speed tyres specified in the table of specifications and dimensions of the former standard are deleted, and table of inflation pressures corresponding to different speeds of tyres under their maximum loads is added (Table 3 of 1997 edition and Table 9 of this edition); The calculation method for tolerance of tyre dimensions is modified (4.5 of 1997 edition and Tables 1, 2, 5, 6, 7, 1 and 11 of this edition); The speed symbols V and W are added into the table of speed symbols corresponding to the maximum speeds; and the requirements for the load capacity variations of motorcycle tyres with the rim diameter 12 and the speed symbol of K or L and those for such variations of motorcycle tyres with the speed 21km/h are added into the table of load capacity variance ratio under different speeds; (Appendix A of 1997 edition and Appendix B of this edition). Appendix A of this Standard is informative, and Appendix B is normative. This Standard is proposed by China Petroleum and Chemical Industry Association. This Standard is under the jurisdiction of National Technical Committee 19 on Tyres and Rims of Standardization Administration of China. The Subcommittee on Motorcycle and Bike Tyre and Rim of Standardization Administration of China is entrusted with the explanation of this Standard. Drafting organizations of this Standard: Diamond Tire Factory of Guangzhou Guangxiang Enterprises Group Co., Ltd., Xiamen Zhengxin Rubber Industry Co., Ltd., Tianjin Wanda Tyre Group Co., Ltd., Dongguan Huacheng Tyre Factory. Chief drafting staff of this Standard: Chen Qiufa, Xiao Chuhua, Lei Ling, Wang Chuanmin, Huang Linzhou. The previous editions of the standard replaced by this Standard are: GB , GB and GB/T Page 4 of 29

5 GB/T Series of Motorcycle Tyres 摩托车轮胎系列 1 Scope This Standard specifies the terms and definitions, classification, designation method of specifications mark and its additional marks, specifications, dimensions, pneumatic pressures, and loads and rims of motorcycle tyres. This Standard is applicable to the new pneumatic motorcycle tyres. 2 Normative References The following documents contain provisions which, through reference in this Standard, constitute provisions of this Standard. For dated reference, subsequent amendments to (excluding corrections to), or revisions of, any of these publications do not apply. However, all parties coming to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of these standards. For undated references, the latest editions of the normative documents referred to apply. GB/T 6326 "Tyre Terms and Definitions" (GB/T , ISO :22, Definitions of Some Terms Used in Tyre Industry - Part 1:Pneumatic Tyres, NEQ) GB/T 1322 "Series of Motorcycle Rims" (GB/T , ISO :24, Motorcycle Tyres and Rims (Code-designated Series) - Part 3: Rims, ISO :1988, Moped Tyres and Rims - Part 2: Rims, ISO 654-2:199, Motorcycle Tyres and Rims (Code-designated Series) - Diameter Codes 4 to 12 - Part 2: Rims, MOD) 3 Terms and Definitions For the purposes of this Standard, the terms and definitions established in GB/T 6326 apply. 4 Classification 4.1 Motorcycle tyres of code-designated series Tyres in this series are applicable to the rims with the nominal diameter being 4 to 21. As for the tyres with the nominal rim diameter larger than or equal to 14, the cylindrical WM rims or 5 tapered MT rims shall be adopted. As for the tyres with nominal rim diameter less than or equal to 12, the divided DT rims, drop center DC rims or 5 tapered MT rims shall be adopted, with the maximum travel speed being 1 km/h; such tyres should not be used for non-highway tasks, such as transporting etc. 4.2 Motorcycle tyres of metric series Page 5 of 29

6 GB/T MT Note: The maximum dimensions in service in this table are reference data for service. a If the design section width of tyre is less than 1mm, the tolerance of section width is ±4mm; If the design section width of tyre is 1mm or above, the tolerance of section width is ± 4%; b The maximum overall diameter of tyre = 2 designed section height nominal rim diameter; The minimum overall diameter of tyre = 2 designed section height.94 + nominal rim diameter; See Table 14 for nominal rim diameters and Table 15 for designed section heights. Page 22 of 29

7 GB/T B.2 Speed symbol See Table B.2 for the corresponding relations between speed symbols and maximum travel speeds. Table B.2 Corresponding Relations between Speed Symbols and Maximum Travel Speeds Speed symbol Maximum travel speed / (km/h) Speed symbol Maximum travel speed / (km/h) A1~A8 5~4 N 14 B 5 P 15 C 6 Q 16 D 65 R 17 E 7 S 18 F 8 T 19 G 9 U 2 J 1 H 21 K 11 V 24 L 12 W 27 M 13 B.3 Load and speed of tyre If the actual service speed of tyre is different from the speed corresponding to the load index of tyre, the load capacity of tyre may vary according to the variance ratios specified in Tables B.3 and B.4. Table B.3 Variance Ratios for Load Capacities under Different Speeds (For the Speeds 15 km/h) Variation in load / % Speed / (km/h) Nominal rim diameter 12 Speed symbols Nominal rim diameter 13 J K L J K L M N P and above Page 28 of 29

8 GB/T Table B.4 Variance Ratios for Load Capacities under Different Speeds (For speeds 21 km/h) Variation in load / % Speed / (km/h) Speed symbol H V W a b b b b a As for the tyres with speed class ZR or ZB, negotiate with the manufacturer regarding the ratio if the maximum speed > 27 km/h. b Only applicable to tyres with the speed class VB or VR. B.4 Dimensions If the permitted rims are used, the designed section width, S, of new tyre and the maximum overall width of section in service, W max, will vary along with the measuring rim width; for each.1 (2.5 mm) of the variation in rim width code, the S and W max will change correspondingly by 1mm. Page 29 of 29