GB/T 2983-2015Series of motorcycle tyres (English PDF)

6.5 and Appendix C);

- ADD a total of 5 new specifications, 3.60-18, 4.60-17, 2.75-8, 3.75-12, and

5.00-12, to the motorcycle tyres of code-designated series; ADD 5

reinforced and 4 heavy-duty varieties to the previous specifications (see

Table 1 and Table 2);

- For the last sentence of the footnote "a" for the new tyre design section

width in specification parameter tables of the metric series motorcycle tyres,

modify it to "For tyres with a tread that is wider than its section width, the

total tread width is designated as the section width. And it shall not be less

than its minimum design section width value." So that it is applicable to

tread profiles other than Type A; and also applicable to the code-designated

series (see Table 1, Table 2, Table 5, Table 6, and Table 7; Table 5, Table 6,

and Table 7 of the 2008 edition);

- Modify the outer diameter design and manufacturing tolerance factor of the

footnote "b" in specification parameter tables for the motorcycle tyres of

code-designated series and metric series; ADD the selected values of

tolerance factor for different tread patterns (see Table 1, Table 2, Table

5~Table 7; Table 1, Table 2, Table 5~Table 7 of the 2008 edition);

- ADD the value regulation of "taking the integer value according to GB/T

8170" when calculating the tyre dimension tolerance, to the footnotes of all

tyre specification parameter tables (see Table 1, Table 2, Table 5, Table 6,

Table 7, Table 10 and Table 11);

- ADD the applicable rims for the nominal section width 3.60 and (small-

diameter) 3.75, 5.00 in motorcycle tyres of code-designated series (see

Table 3 and Table 4);

- ADD the nominal aspect ratios of 30, 35 and 75 for metric series motorcycle

tyres (nominal rim diameter of 13~24); and, supplement 27 new

specifications (see Table 5 and Table 6);

- ADD 9 new specifications of metric series motorcycle tyres (nominal rim

diameter of 8~12) (see Table 7);

- ADD the applicable rims for 9 new nominal section widths in the metric

series motorcycle tyres (see Table 8);

- ADD the parameters for nominal rim diameters of 11, 20M/C, 23M/C and

24M/C (see Table 14);

- ADD 17 tyre design section height values corresponding to the newly-added

nominal section widths (see Table 15);

- Modify the division of tread patterns of motorcycle tyres to no longer being

limited to the previous metric series; redefine the scope of application (see

Appendix A; Appendix A of the 2008 edition);

- ADD speed symbol Y (see Table B.2);

- For the load-carrying change rate of tyres with different speeds of <=150

km/h, add the applicable symbols and related instructions (see Table B.3).

This Standard uses the redraft law to refer to ISO 4249-1.1985 "Motorcycle

tyres and rims (code-designated series) - Part 1.Tyre", ISO 4249-2.1990

"Motorcycle tyres and rims (code-designated series) - Part 2.Tyre load ratings",

ISO 4249-3.2010 "Motorcycle tyres and rims (code-designated series) - Part 3.

Rims", ISO 5751-1.2010 "Motorcycle tyres and rims (metric series) - Part 1.

Design guides", ISO 5751-2.2010 "Motorcycle tyres and rims (metric series) -

Part 2.Tyre dimensions and load-carrying capacities", ISO 5751-3.2010

"Motorcycle tyres and rims (metric series) - Part 3.Range of approved rim

contours", ISO 5995-1.1982 "Moped tyres and rims - Part 1.Tyres", and ISO

6054-1.1994 "Motorcycle tyres and rims (code-designated series) - Diameter

codes 4 to 12 - Part 1.Tyres" for preparation. The degree of consistency with

them is non-equivalent.

This Standard was proposed by China Petroleum and Chemical Industry

Federation.

This Standard shall be under the jurisdiction of National Technical Committee

4.1 Motorcycle tyres of code-designated series

This series of tyres are suitable for rims with a nominal rim diameter of 4~21.

Tyres with a nominal rim diameter greater than or equal to 14 shall use

cylindrical bead seat rims (WM type) or 5° inclined-bottom bead seat rims (MT

type).

Tyres with a nominal rim diameter less than or equal to 12 shall use divided

rims (DT type), or drop center rims (DC type), or 5° inclined-bottom bead seat

rims (MT type). The maximum running speed is 100 km/h.

4.2 Motorcycle tyres of metric series

This series stipulates metric series motorcycle tyres with nominal tyre aspect

ratios of 30, 35, 40, 50, 55, 60, 65, 70, 75, 80, 90, 100.They are suitable for

cylindrical bead seat rims (WM type) or 5° inclined-bottom bead seat rims (MT

type) with nominal rim diameters of 8~24.

5.1 Motorcycle tyres of code-designated series

Example.

5.2 Motorcycle tyres of metric series

Example.

For tyres with a maximum running speed of more than 240 km/h, the structure

code shall be replaced by the speed class. VB or ZB for bias belted structure;

VR or ZR for radial structure. Among them, ZB and ZR are suitable for new-

designed motorcycles. The relevant regulations are as follows.

a) For tyres whose speed exceeds 240 km/h and speed category is "V", "VB"

or "VR", the use characteristics with speed symbol "V" shall be marked in

brackets; such as "120/60 VR 17 M/C (55 V)";

b) For tyres with a maximum speed of 270 km/h and a speed category of

"ZB" or "ZR", the use characteristics with speed symbol "W" shall be

marked; such as "120/60 ZR 17 M/C 55 W";

c) For tyres whose speed exceeds 270 km/h and speed category is "ZB" or

"ZR", the use characteristics with speed symbol "W" shall be marked in

brackets; such as "120/60 ZR 17 M/C (55 W)";

d) The maximum speed, approved by the tyre manufacturer, can also be

marked on the tyre. For example, "V250" means that the maximum speed

Nominal section width (in)

5.3 Moped tyres

According to the marking regulations of GB 518, this series of products are

marked as "MOPED".

Example.

6.1 For motorcycle tyres of code-designated series, the specifications, the

measuring rim width code, the section width and outer diameter of the new tyre

after inflation, the load-carrying capacities, the load index, and the inflation

pressure shall meet the requirements of Table 1 and Table 2.

See Table 3 and Table 4 for the applicable rims of the motorcycle tyres of code-

designated series.

6.2 For motorcycle tyres of metric series, the specifications, the measuring rim

width code, the section width and outer diameter of the new tyre after inflation,

the load-carrying capacities, and the load index shall meet the requirements of

Table 5, Table 6, and Table 7.

See Table 8 for the applicable rims of the motorcycle tyres of metric series.

See Table 9 for the inflation pressures corresponding to different speeds under

the maximum load of the motorcycle tyres of metric series.

6.3 For moped tyres, the specifications, the measuring rim width (code), the

section width and outer diameter of the new tyre after inflation, the load-carrying

capacities, the load index, and the inflation pressure shall meet the

requirements of Table 10 and Table 11.

See Table 12 and Table 13 for the applicable rims of the moped tyres.

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