Document ID: chunk:federal_register_of_legislation:F2018L01517:reg:200:p8
Version: federal_register_of_legislation:F2018L01517
Segment Type: reg
Provision Reference: reg 200 (pt 8/10)
Character Range: 99495–102129

above.
4. The overall width is measured by caliper at six equally-spaced points, account being taken of the thickness of the protective ribs or bands.  The highest measurement so obtained is taken as the overall width.
5. The outer diameter is calculated from the maximum circumference.

Annex 7
Procedure for load/speed endurance tests
1. Preparing the tyre
1.1. Mount a new tyre on the test rim specified by the manufacturer pursuant to paragraph 4.1.11. of this Regulation.
1.2. Use a new inner tube or combination of inner tube, valve and flap (as required) when testing tyres with inner tubes.
1.3. Inflate the tyre to the pressure corresponding to the pressure index specified by the manufacturer pursuant to paragraph 4.1.12. of this Regulation.
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 1.3. above.
2. Test procedure
2.1. Mount the tyre-and-wheel assembly on the test axle and press it against the outer face of a smooth power-driven test drum 1.70 m  1 per cent in diameter having a surface at least as wide as the tyre tread.
2.2. Apply to the test axle a series of test loads expressed in per cent of the load indicated, in Annex 4 to this Regulation, opposite the load index engraved on the sidewall of the tyre, in accordance with the test programme below.  Where the tyre has load-capacity indices for both single and twinned utilization, the reference load for single utilization shall be taken as the basis for the test loads.
2.2.1. In the case of tyres with a speed category symbol above P, test procedures are as specified in paragraph 3.
2.2.2. For all other tyre types, the endurance test programme is shown in Appendix 1 to this annex.
2.3. The tyre pressure must not be corrected throughout the test and the test load must be kept constant throughout each of the three test stages.
2.4. During the test the temperature in the test-room must be maintained at between 20 °C and 30 °C or at a higher temperature if the manufacturer so agrees.
2.5. The endurance-test programme shall be carried out without interruption.
3. Load/speed test programme for tyre with speed category symbol Q and above
3.1. This programme applies to:
3.1.1. All tyres marked with load capacity index in single 121 or less.
3.1.2. Tyres marked with load capacity index in single 122 and above and with the additional marking "C", or "LT", referred to in paragraph 3.1.13. of this Regulation.
3.2. Load placed on the wheel as a percentage of the load corresponding to the load index:
3.2.1. 90 per cent when tested on