Proposal to transition test facilities from ISO 10844:2014 to ISO 10844:2021 by January 2029.

Comments concerning:

• AVAS Pause Switch
• AVAS Sound Pressure Levels
• Maximum AVAS Sound Pressure Level
• AVAS Sound when vehicle stationary

Information concerning discussions on the proposals to extend the scope to ‘E’ speed symbol.

Small group (France, Netherlands, ETRTO, BIPAVER) proposal to restructure retreaded tyre requirements and regulations.

Small group proposal to split retreaded tyre requirements into a new UN Regulation.

Proposal from a small group effort for uniform provisions concerning the approval of pre-cured tread materials which are used for producing retreaded tyres or the approval of retreaded tyres produced by using mould cure process with regard to their snow performance.

Proposal to amend rolling resistance provisions with regard to heavy-duty-use light trucks.

Proposal to allow using the state-of-the-art test track from the latest standard ISO 10844:2021.

Proposal to allow using the state-of-the-art test track from the latest standard ISO 10844:202

Proposal to allow using the state-of-the-art test track from the latest standard ISO 10844:2021.

Proposal to provide industry guidelines on anti-tampering provisions for Non-Original Replacement Exhaust Silencing Systems (NORESS) in UN Regulation No. 92.

Proposal to specify explicitly that the maximum overall width of tyres identified by the “tyre to rim fitment configuration” symbol “A” includes a 4 per cent tolerance.

Proposal from the Measurement Uncertainties informal group to introduce measures to reduce variability in noise measurements.

Proposals:

• Para. 2.2.3.: Information related to construction materials is clarified.
• Para. 2.2.4.: Deleted, since its content is covered by paragraph 2.2.8. in the proposed wording.
• Para. 2.2.8.: The notion of the wheel geometric shape is clarified.
• Para. 2.9.: The notion of defects caused by the production process is clarified. Only in the Russian language it is clarified that the crack propagation is actually a length and a depth of the crack. The proposed text makes it possible to distinguish between a crack that occurred during testing and a scratch, which may be an acceptable manufacturing defect.
• Para. 3.1.2.13.: The technical description of the wheel is supplemented with information describing the product quality control in the production process.
• Para. 5.1.6. and Annex 3: The application of optional marking is aimed at providing the consumers with information on the quality control of the manufactured wheel, as well as facilitating the selection of wheels with the required characteristics by consumers in case of providing with incomplete information on suitable vehicle types in accordance with paragraph 1.2. of Annex 10.
• Annex 4, para. (а): The language of the provision is clarified.
• Annex 4, paras. (b) and (d): Deleted, since the existing experience of testing confirms that the mechanical properties of the raw materials are not comparable with the mechanical properties of finished products (wheels). In this regard, there is no need to test the raw materials.
• Annex 4, para. (с): The list of critical zones on wheels where to take the material to check its characteristics is clarified. These critical zones shall be specified by the manufacturer in the application documentation, and they can also be specified by the technical service. A description of the characteristics of the material taken from paragraph (b) is provided, since this paragraph is deleted. Only in the Russian language the terms concerning the measured values have been changed.
• Annex 4, para. (e): It is specified that the analysis of metallurgical defects is carried out in the most loaded spots of the wheels. These spots shall be specified by the manufacturer in the application documentation, and they can also be specified by the technical service. The analysis shall be carried out in comparison with the permissible defects specified by the manufacturer.
• Annex 6: A recommendation is added to identify cracks occurred as a result of the test by using penetrating paints.
• Annexes 7 and 8: The pressure drop in the tyre as a consequence of testing the wheel assembly with the tyre may not be due to damage to the wheel, but to damage to the tyre. To eliminate uncertainty in the interpretation of the test results, it is necessary to determine the cause of the tyre pressure drop. If the pressure drop in the tyre was caused by its damage, then it is necessary to carry out the tests again, using a new tyre.

Proposal to specify the working principles of an Acoustic Vehicle Alerting System (AVAS) and to reduce measurement uncertainties during the measurement of the one third octave bands.

Proposal from the ad hoc working group on retreaded tyres to move provisions for snow grip performance of retreaded tyres and their classification as traction tyres from R109 into a new UN Regulation on type approval of retreaded tyres of classes C1, C2 and C3 with respect to their snow grip performance and/or classification as traction tyre.

Proposal to reduce noise measurement variability, completing the amendment proposal adopted at the seventy-eighth session of the Working Party on Noise and Tyres (informal document GRBP-78-05 replacing ECE/TRANS/WP.29/GRBP/2023/19).

Proposal to introduce a new temperature correction formula for the rolling sound emissions of tyres of classes C1 and C2, to remove the content of the now obsolete Annex 4 as well as all its references, to update references to standards, and to make editorial improvements for clarity and consistency across tyre regulations.

Proposal to complete the amendment proposal adopted at the 78th GRBP session (informal document GRBP-78-05 replacing ECE/TRANS/WP.29/GRBP/2023/19).

Proposal to improve the reproducibility of the snow grip test method by replacing the current reference tyres C3 SRTTs 19.5 and 22.5 with the new reference tyres C3 SRTTs 19.5 and 22.5 siped.

Proposal from the Measurement Uncertainties informal group for a Document for Reference providing a general approach on how to handle measurement uncertainties in UN Regulations (initially addressing UN Regulations Nos. 51 and 117).

Proposal to improve the reproducibility of the snow grip test method by replacing the current reference tyres C3 SRTTs 19.5 and 22.5 with the new reference tyres C3 SRTTs 19.5 and 22.5 siped.

Proposal from Task Force on Tyre Abrasion (TFTA) to introduce test methods to measure tyre abrasion.

Proposal from the ad hoc working group on retreaded tyres to move provisions for snow grip performance of retreaded tyres and their classification as traction tyres from UN R108 and R109 into a new UN Regulation on type approval of retreaded tyres of classes C1, C2 and C3 with respect to their snow grip performance and/or classification as traction tyre.

Proposal for editorial improvements and updates to ISO and ASTM standards references and to align with Supplement 2 to the 04 series of amendments, including a new temperature correction formula for the rolling sound emissions of tyres of classes C1 and C2 and to remove the content of the now obsolete Annex 4 as well as all its references.

Proposal from the ad hoc working group on retreaded tyres to move provisions for snow grip performance of retreaded tyres and their classification as traction tyres from UN R108 into a new UN Regulation on type approval of retreaded tyres of classes C1, C2 and C3 with respect to their snow grip performance and/or classification as traction tyre.

Proposal to align Annex 9 with Annex 1 (paragraphs 5., 6. and 7.) and to enable type approval authorities to make the connection with the relevant reports.

Proposal for editorial corrections.

Proposal to clarify the text:

• Term “construction materials”
• interpretation of paras. 2.2.4. and 2.2.8.
• supplement technical description of the wheel with information describing production quality control
• option for additional consumer-oriented marking
• clarify Annex 4 and exclude aluminum-alloy and magnesium-alloy wheels under test (b)
• clarify Annex 6 with regard to possible defects caused by the production process and not affecting the appearance of cracks during testing
• recommend under Annex 6 to identify cracks occurred as a result of the test by using penetrating paints
• clarify Annexes 7 and 8 with regard to air leakage.

Proposal to allow the use of LT-marked tyres under certain conditions and weight limits with a rolling resistance greater than the current limits.