Document ID: chunk:federal_register_of_legislation:F2018L01518:reg:8
Version: federal_register_of_legislation:F2018L01518
Segment Type: reg
Provision Reference: reg 8
Character Range: 59284–60564

8           2.5                            2.8         3.0

1.2.3. in standard radial tyres:  to 1.8 bar;

1.2.4. In reinforced tyres: to 2.2 bar;

1.2.5. in T-tyre temporary use spare tyres:  to 4.2. bar.

2. Condition the tyre,  mounted on its rim,  at the ambient  room temperature for not less than 24 hours, save as otherwise prescribed in paragraph 6.2.3. of this Regulation.

3. Readjust the pressure to the level specified in paragraph 1.2. above.

4. Measure the overall width by calliper at six equally-spaced points, taking the thickness of the protective ribs or bands into account.  The highest measurement so obtained is taken as the overall width.

5. Determine the outer diameter by measuring the maximum circumference and dividing the figure so obtained by π (3.1416).

Annex 7

Procedure for load/speed performance tests

1. Preparing the tyre

1.1. Mount a new tyre on the test rim specified by the manufacturer pursuant to paragraph 4.1.12. of this Regulation.

1.2. Inflate it to the appropriate pressure as given (in bar) in the table below:

T-type temporary use spare tyres:  to 4.2 bar.
Speed category  Diagonal (bias-ply) tyres  Radial/Run flat system  Bias-belted tyres
Ply rating      Standard                   Reinforced              Standard