Document ID: chunk:federal_register_of_legislation:F2018L01518:reg:4:p1
Version: federal_register_of_legislation:F2018L01518
Segment Type: reg
Provision Reference: reg 4 (pt 1/4)
Character Range: 60564–63515

4               6                          8

L, M, N         2.3                        2.7                     3.0                2.4           2.8  -

P, Q, R, S      2.6                        3.0                     3.3                2.6           3.0  2.6

T, U, H         2.8                        3.2                     3.5                2.8           3.2  2.8

V               3.0                        3.4                     3.7                3.0           3.4  -
W               -                          -                       -                  3.2           3.6  -
Y               -                          -                       -                      3.2 [1/]  3.6  -

1.3. The manufacturer may request, giving reasons, the use of a test‑inflation pressure differing from those given under paragraph 1.2. above.  In such a case the tyre shall be inflated to that pressure.

1.4. Condition the tyre-and-wheel assembly at test-room temperature for not less than three hours.

1.5. Readjust the tyre pressure to that specified in paragraph 1.2. or 1.3. above.

2.  Carrying out the test

2.1. Mount the tyre-and-wheel assembly on a test axle and press it against the outer face of a smooth wheel 1.70 m + 1 per cent or 2 m + 1 per cent in diameter.

2.2. Apply to the test axle a load equal to eighty per cent of:

2.2.1. The maximum load rating equated to the Load Capacity Index for tyres with Speed Symbols L to H inclusive,

2.2.2. The maximum load rating associated with a maximum speed of 240 km/h for tyres Speed Symbol "V" (see para. 2.37.2. of this Regulation).

2.2.3. The maximum load rating associated with a maximum speed of 270 km/h for tyres with speed symbol "W" (see paragraph 2.37.3. of this Regulation).

2.2.4. The maximum load rating associated with a maximum speed of 300 km/h for tyres with speed symbol "Y" (see paragraph 2.37.4. of this Regulation).

2.3. Throughout the test the tyre pressure must not be corrected and the test load must be kept constant.

2.4. During the test the temperature in the test-room must be maintained at between 20° and 30° or at a higher temperature if the manufacturer agrees.

2.5. Carry the test through, without interruption in conformity with the following particulars:

2.5.1. time taken to pass from zero speed to initial test speed:  10 minutes;

2.5.2. Initial test speed: prescribed maximum speed for the type of tyre (see paragraph 2.37.1. of this Regulation), less 40 km/h in the case of the smooth wheel having 1.70 m ± 1 per cent in diameter or less 30 km/h in the case of the smooth wheel having 2 m ± 1 per cent in diameter;

2.5.3. successive speed increments:  10 km/h;

2.5.4. duration of test at each speed step except the last:  10 minutes;

2.5.5. duration of test at last speed step:  20 minutes;

2.5.6. maximum test speed:  prescribed maximum speed for the type of tyre, less 10 km/h in the case of the smooth wheel having 1.7 m + 1 per cent in