Document ID: chunk:federal_register_of_legislation:F2006L01788:front:0:p5
Version: federal_register_of_legislation:F2006L01788
Segment Type: other
Provision Reference: 
Character Range: 14199–17394

hours.
23.3.1.3.                    Readjust pressure to that specified in clauses 23.3.1.1.1 or 23.3.1.1.2 as appropriate.
23.3.1.4.                    Caliper the 'Section Width' and 'Overall Tyre Width' at 6 points approximately equally spaced around the tyre circumference.
23.3.1.5.                    Record the average of these measurements as the 'Section Width' and 'Overall Tyre Width', respectively.
23.3.1.6.                    Determine 'Tyre Outer Diameter' by measuring the maximum circumference of the tyre and dividing this dimension by .
23.3.2.                          Resistance to 'Bead' Unseating Test (for tubeless tyres only)
23.3.2.1.                    Preparation of tyre 'Test Rim' assembly
23.3.2.1.1.              Wash the tyre, dry it at the 'Beads', and mount it without lubrication or adhesive on a clean, painted test 'Rim'.
23.3.2.1.2.              Adjust the pressure to the applicable pressure specified in clause 23.3.1.1.2 at ambient room temperature.
23.3.2.1.3.              Mount the tyre and 'Test Rim' in the fixture shown in Figure 1, and force either of the standard blocks shown in Figure 2 against the tyre 'Sidewall' as required by the geometry of the fixture, or by any other 'Approved'  test procedure.
23.3.2.2.                    Test procedure
23.3.2.2.1.              Apply the load through the block to the tyre's outer 'Sidewall' at a distance no less than that specified in Figure 1 or the mid point of the tyre's section height, for the applicable 'test rim' at a rate of 5010 mm per minute, with the load arm substantially parallel to the tyre and 'Rim' assembly at the time of engagement.
23.3.2.2.2.              Increase the load until the 'Bead' unseats or the applicable value specified in clause 23.2.2.2.4 is reached.
23.3.2.2.3.              This test must be repeated at least 4 times at locations approximately equally spaced around the tyre circumference.
23.3.3.                          Tyre Strength (Breaking Energy) Test
23.3.3.1.                    Preparation of tyre
23.3.3.1.1.              Mount the tyre on a 'Test Rim' and inflate it to the applicable pressure specified in clause 23.3.1.1.2.
23.3.3.1.2.              Condition it at test room temperature for at least 3 hours.
23.3.3.1.3.              Readjust its pressure to that specified in clause 23.3.1.1.2.
23.3.3.2.                    Test procedure
23.3.3.2.1.              Force a cylindrical steel plunger with a hemispherical end and a diameter of 19±1.6 mm perpendicularly into the 'Tread' as near to the centreline as possible, avoiding penetration into any 'Tread' 'Groove', at the rate of 50 ±10 mm per minute.
23.3.3.2.2.              Record the force and penetration at the moment of breaking at each of 5 test points approximately equally spaced around the circumference of the tyre.  If the tyre fails to break before the plunger is stopped on reaching the 'Rim', and the required minimum breaking energy is not achieved, then the required minimum breaking energy is deemed to have been achieved at that point.
23.3.3.2.3.              Compute the breaking energy for each test point by means of the following formula:

         W = F  P