Proposal to
- 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
- Update standard reference to ASTM F2493-244, F3611-24, F3676-24, F3675-24 and ISO 4000-1:2024
- Align the definitions of tread groove and principal grooves with proposals for UN R30 and R54
- Simplify the wording of the requirements for professional off-road tyres
- Correct the transitional provision in paragraph 12.23. to specify approvals “first issued after 31 August 2028”.
17. The expert from ETRTO tabled editorial corrections to the 02 and 04 series of amendments to UN Regulation No. 117 (ECE/TRANS/WP.29/GRBP/2025/12 and ECE/TRANS/WP.29/GRBP/2025/13). GRBP adopted these proposals, as amended GRBP-81-08-Rev.1 and GRBP-81-09-Rev.1., and requested the secretariat to submit them for consideration and vote at the June 2025 sessions of WP.29 and AC.1 as respectively draft Supplement 17 to the 02 series of amendments and draft Supplement 3 to the 04 series of amendments to UN Regulation No. 117. For the latter, GRBP agreed to combine it with the amendment proposal to the same series of amendments that was adopted at the previous session (ECE/TRANS/WP.29/GRBP/2024/23 as amended by GRBP-80-11).
12. The expert from ETRTO presented background information on a set of proposals clarifying definitions and making editorial changes in several UN Regulations on tyres (GRBP-81-13-Rev.1). For UN Regulation No. 30, ETRTO tabled draft amendments in ECE/TRANS/WP.29/GRBP/2025/9. GRBP adopted this proposal, as amended by GRBP-81-05-Rev.1 and subject to correcting the new paragraph number to 2.25.3.4.1. and requested the secretariat to submit it for consideration and vote at the June 2025 sessions of WP.29 and AC.1 as draft Supplement 27 to the 02 series of amendments to UN Regulation No. 30.