Document ID: chunk:federal_register_of_legislation:F2021C00470:body:0:p7
Version: federal_register_of_legislation:F2021C00470
Segment Type: other
Provision Reference: 
Character Range: 19941–22723

`Section Width' of the tyre to be tested, or an `Approved' equivalent test wheel.
23.3.4.2.2.              During the test the ambient temperature at a distance of not less than 150 mm and not more than one metre from the tyre shall be at least 35 degrees Celsius. No provision shall be made for cooling the tyre during the test.
23.3.4.2.3.              Conduct the test at not less than 80 km/h test speed with loads and test periods not less than those shown in the following schedule:-

23.3.5.                          High Speed Test
23.3.5.1.                    Preparation of tyre
23.3.5.1.1.              Mount the tyre on a 'Test Rim' and inflate it to a pressure equal to the pressure specified in the 'Nominated Standard' for its 'Maximum Load Rating' plus an increase no greater than that specified in Table 1 for its 'Speed Category'.
23.3.5.1.2.              Condition the tyre assembly at a temperature not less than 35 degrees Celsius for at least 3 hours.
23.3.5.1.3.              Readjust the tyre pressure to that specified in Clause 23.3.5.1.1 immediately before testing.
23.3.5.2.                    Test procedure
23.3.5.2.1.              Mount the tyre and 'Test Rim' assembly on a test axle and press it against a flat-faced, steel test wheel of an outside diameter not greater than               1.71 metres, and at least as wide as the 'Section Width' of the wheel to be tested (or an 'Approved' equivalent test wheel) with a load not less than 80 percent of the 'Maximum Load Rating' of the tyre,
23.3.5.2.2.              During the test the ambient temperance at a dunce of not less than 150 mm and not more than one metre from the tyre shall be at least 35 degrees Celsius. No provisions shall be made for cooling the tyre during the test.
23.3.5.2.3.              Operate the equipment to bring the 'Test Wheel Speed' from zero up to the initial 'Test Wheel Speed' in a period of at least 10 minutes.
23.3.5.2.4.              The initial 'Test Wheel Speed' is equal to the maximum speed shown in Table 1 a corresponding to the tyre's 'Speed Category' symbol, less 40 km/h.
23.3.5.2.5.              The initial 'Test Wheel Speed for tyres of 'Speed Category' "V". is 170 km/h.
23.3.5.2.6.              Operate the equipment with the 'Test Wheel Speed' not les than the initial 'Test Wheel Speed for at least 10 minutia, then at not less than the initial 'Test Wheel Speed' plus 10 km/h for at least a further 10 minters, then at not less than the initial 'Test Wheel Speed' plus 20 km/h for at least a further 10 minutes and finally at not less than the initial 'Test Wheel Speed' plus 33 km/h for at least a further 20 minutes.
23.3.5.3.                    The technical requirements specified in Annex 7 of United Nations Regulation No. 30 - UNIFORM