Proposal to

1. Update standard reference to ASTM F2493-24 and ISO 4000-1:2024
2. Align the definitions of tread groove and principal grooves with proposals for UN R30 and R54
3. Simplify the wording of the requirements for professional off-road tyres
4. Correct the transitional provision in paragraph 12.23. to specify approvals “first issued after 31 August 2028”.

Proposal to

1. Clarfy the scope to reflect that adhesion performance on wet surfaces (wet adhesion) is required not only for C1 tyres, but also C2 and C3 tyres
2. Update standard reference to ASTM F2493-244, F3611-24, F3676-24, F3675-24 and ISO 4000-1:2024
3. Align the definitions of tread groove and principal grooves with proposals for UN R30 and R54
4. Simplify the wording of the requirements for professional off-road tyres
5. Correct the transitional provision in paragraph 12.23. to specify approvals “first issued after 31 August 2028”.

Presentation by the IWG WGWT on the proposal to replace document ECE/TRANS/WP.29/GRBP/2024/23 by GRBP-80-11

ETRTO recommends to create a GRBP GOIE (Group of Interested Experts) involving CP’s
and NGO’s and with the goal to present an Informal Document by GRBP February 2025
session to validate the concept to be followed and implemented in a Working Document
by September 2025

Proposal by the IWG WGWT to replace document ECE/TRANS/WP.29/GRBP/2024/23. This proposal aims as a first step to standardize the water depth measurement.

Draft proposal to supersede the proposal in document GBRP/2024/23 (concerning water-depth measurement provisions and track-friction range requirements).

Proposal from the Wet Grip on Worn Tyres informal group to standardize provisions for the water depth measurement and to reduce the track friction range requirements under the test procedures.

Proposal to clarify that wet adhesion provisions apply to C1, C2, and C3 tyres, correct ISO and internal references, clarify symbols “ARC” and “ARR” relationships to indoor drum test method, and clarify application to M+S marked tyres.

Working draft proposal concerning wet grip performance of worn tyres.

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, to make 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 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, 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, and to make editorial improvements for clarity and consistency across tyre regulations.

Proposal to introduce measures to reduce variability in noise measurements and new test methods to measure tyre abrasion.

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

Proposal to replace document ECE/TRANS/WP.29/GRBP/2024/06

Proposal to replace document ECE/TRANS/WP.29/GRBP/2024/09

Proposal to replace document ECE/TRANS/WP.29/GRBP/2024/07

Overview of convoy methods.