Document ID: chunk:federal_register_of_legislation:F2018L01517:reg:30:p1
Version: federal_register_of_legislation:F2018L01517
Segment Type: reg
Provision Reference: reg 30 (pt 1/12)
Character Range: 17215–20206

30                                      762

2.20.1.4. An indication of the tyre to rim fitment configuration when it differs from the standard configuration and is not already expressed by the symbol "d" denoting the nominal rim diameter code;
2.21. "Nominal rim diameter (d)" means the diameter of the rim on which a tyre is designed to be mounted[3];
2.22. "Rim" means the support for a tyre-and-tube assembly, or for a tubeless tyre, on which support the tyre beads are seated[3];
2.23. "Theoretical rim" means a rim whose width would be equal to x times the nominal section width of a tyre; the value of x shall be specified by the manufacturer of the type;
2.24. "Measuring rim" means the rim on which a tyre must be fitted for dimensional measurements;
2.25. "Test rim" means the rim on which a tyre must be fitted for load/speed endurance testing;
2.26. "Chunking" means the breaking away of pieces of rubber from the tread;
2.27. "Cord separation" means the parting of the cords from their coating;
2.28. "Ply separation" means the parting of adjacent plies;
2.29. "Tread separation" means the pulling away of the tread from the carcass;
2.30. "Load-capacity index" means one or two numbers, which indicate the load the tyre can carry in single or in single and dual operation at the speed corresponding to the associated speed category and when operated in conformity with the requirements governing utilization specified by the manufacturer.  A type of tyre can have either one or two sets of load capacity indices depending on whether or not the provisions of paragraph 6.2.5. are applied.  The list of these indices and their corresponding loads is given in Annex 4;
2.31. "Speed category" means:
2.31.1. The speeds, indicated by a symbol, at which the tyre can carry the load indicated by the associated load-capacity index;
2.31.2. The speed categories are as shown in the table below[4]:
Speed-category symbol  Corresponding speed (km/h)
F                      80
G                      90
J                      100
K                      110
L                      120
M                      130
N                      140
P                      150
Q                      160
R                      170
S                      180
T                      190
U                      200
H                      210

2.32. "Table load-capacity variation with speed" means:
 The table, in Annex 8, showing as a function of the load-capacity indices and nominal-speed-category symbols the load variations, which a tyre can withstand when used at speeds different from that conforming to its nominal-speed-category symbol.  The load variations do not apply in the case of the additional load capacity symbol and speed category obtained when the provisions of paragraph 6.2.5. are applied;
2.33. "Void to fill ratio" means the ratio between the area of voids in a reference surface and the area of this reference surface calculated from the mould drawing;
2.34. "Tyre Class" means