Document ID: chunk:federal_register_of_legislation:F2021C00470:body:0:p3
Version: federal_register_of_legislation:F2021C00470
Segment Type: other
Provision Reference: 
Character Range: 8103–11485

and the outer diameter of a tyre determined on the 'Measuring Rim'.
23.1.16.                      'Specified Design Section Width' - the width specified in the 'Nominated Standard' for a new tyre of that size designation and type when inflated on its 'Measuring Rim'.
23.1.17.                      'Test Rim' - any 'Rim' conforming to the dimensions of the 'Measuring Rim' for the particular tyre size designation and type.
23.1.18.                      'Test Wheel Speed' - the peripheral speed of the steel test wheel
23.1.19.                      'Tread Separation' - pulling away of the 'Tread' from the tyre 'Carcass'.
23.1.20.                      'Treadwear Indicator' an indicator incorporated into the 'Tread' of a tyre which gives visual indication when the 'Tread' has worn down to leave a pie-determined minimum 'Groove' depth.
23.1.21.                      'Tyre Carcass Construction Symbol' - relates to the type of 'Carcass' construction used in the manufacture of the tyre, viz:

         D - Diagonal Ply

         B - Bias-Belted

         R - Radial Ply.

23.2.                                REQUIREMENTS
23.2.1.                          Size and Construction
23.2.1.1.                    The tyre manufacturer shall specify the 'Nominated Standard' with which the tyre design complies in respect to 'Maximum Load Rating', inflated dimensions, design or 'Measuring Rim' and alternative 'Rim' fitments.
23.2.1.2.                    The 'Administrator' may accept a tyre, 'Rim' or tyre and 'Rim' combination incorporated in a 'Nominated Standard' referred in Clause 23.1.16.
23.2.2.                          Performance Requirements
23.2.2.1.                    General

         Each new tyre shall conform to each of the following:

23.2.2.1.1.              It shall meet the requirements specified in arm 23.2.2.2 for its size designation, type, 'Maximum Load Rating', 'Speed Category' or 'Service Description'.
23.2.2.1.2.              It shall incorporate at least 4 'Treadwear Indicators' approximately equally spaced, each of which provides for a visual indication when the 'Tread' in the vicinity of the indicator has a 'Groove' depth of 1.60 + 0.40,- 0.25 mm.
23.2.2.2.                    Test requirements
23.2.2.2.1.              Test sample selection

         Three new tyres having identical characteristics when described according to requirements of Clause 23.2.3 shall comprise a test sample:

23.2.2.2.1.1.       one tyre shall be used for physical dimensions, resistance to 'Bead' unseating, and strength, in sequence;
23.2.2.2.1.2.       a second tyre shall be used for tyre endurance; and
23.2.2.2.1.3.       a third tyre for high speed performance
23.2.2.2.2.              In the tests, pressures shall be established within 10 kPa or one psi (as appropriate) of the values specified for each test
23.2.2.2.3.              Physical dimensions requirements

         Each tyre shall conform to each of the following when measured in accordance with Clause 23.3.1:

23.2.2.2.3.1.       its actual 'Section Width' and 'Overall Tyre Width' shall not exceed by more than 7 percent the 'Section Width' specified in the 'Nominated Standard' for its size designation and type.
23.2.2.2.3.2.       its 'Size Factor' shall be at least as large as the minimum 'Size Factor' specified in the `Nominated Standard' for its size designation and type. If the