22. The expert of ETRTO tabled proposals for a new Supplement to the 04 series of amendments with the aim to introduce editorial corrections and the new C3 reference test tyres (ECE/TRANS/WP.29/GRBP/2024/4, ECE/TRANS/WP.29/GRBP/2024/6, GRBP-79-21). The experts from France and Japan commented on the proposals (GRBP-79-50 and GRBP-79-07). GRBP adopted the proposals in ECE/TRANS/WP.29/GRBP/2024/4 as amended by GRBP-79-50 and in ECE/TRANS/WP.29/GRBP/2024/6 as amended by GRBP-79-21, and requested the secretariat to submit them for consideration and vote at the June 2024 sessions of WP.29 and AC.1 as part of draft Supplement 2 to the 04 series of amendments to UN Regulation No. 117.

25. During consideration of the above amendment proposals to various series of amendments to UN Regulation No. 117, GRBP took note of supporting material by Japan (GRBP-79-10) and by ETRTO (GRBP-79-36), as well as a summary table of all submitted documents (GRBP-79-35-Rev.2).

29. The expert of TF TA presented a proposal for a Supplement to the 04 series of amendments to UN Regulation No. 117 that introduced test methods to measure tyre abrasion (ECE/TRANS/WP.29/GRBP/2024/10, GRBP-79-12-Rev.2). Subject to correcting the references to 5.7.-5.10. in paragraph 3.1., GRBP adopted the proposal, as amended by GRBP-79-12-Rev.2 and requested the secretariat to submit it for consideration and vote at the June 2024 sessions of WP.29 and AC.1 as part of draft Supplement 2 to the 04 series of amendments to UN Regulation No. 117.

23. The expert from IWG MU proposed measures to reduce variability (ECE/TRANS/WP.29/GRBP/2023/19 and GRBP-78-05). GRBP adopted the proposal, as laid down in GRBP-78-05, and requested the secretariat to submit it for consideration and vote at the June 2024 sessions of WP.29 and AC.1 as draft Supplement 2 to the 04 series of amendments to UN Regulation No. 117.