16. The expert from ETRTO introduced an amendment proposal with the aim to improve the reproducibility of the test method from standard ISO 23671 (ECE/TRANS/WP.29/GRBP/2020/16). Following concerns of the experts from Germany and Spain about paragraph 4.1.2.1. of Annex 5, part A, the expert from ETRTO proposed a modification to this paragraph (GRBP-72-29). GRBP adopted the proposal, as amended by Annex VIII of the session report, and requested the secretariat to submit it to WP.29 for consideration and vote at their March 2021 sessions as a draft Supplement 13 to the 02 series of amendments to UN Regulation No. 117.

17. The expert from ETRTO proposed further amendments with a view to modifying the word “moulded” in tyre marking methods and replacing the Standard Reference Test Tyre SRTT14 by SRTT16 (ECE/TRANS/WP.29/GRBP/2020/17). GRBP adopted the proposal, subject to deletion of paragraph 9.1., and requested the secretariat to submit it to WP.29 and for consideration and vote at their March 2021 sessions as part of draft Supplement 13 to the 02 series of amendments to UN Regulation No. 117.

18. On behalf of IWG for Wet Grip on Worn Tyres (WGWT), the expert of ETRTO reported on their progress (GRBP-72-06) and introduced amendments to the IWG Terms of Reference (ECE/TRANS/WP.29/GRBP/2020/11). The expert of EC proposed to extend the IWG scope to C2 and C3 tyres (GRBP-72-02). The expert from ETRTO commented on this proposal (GRBP-72-26-Rev.1). Following a discussion, GRBP was not in a position to reach a consensus on the EC proposal and decided to come back to revision of ToR at the next session. Meanwhile, GRBP agreed to request WP.29 to extend the mandate of IWG WGWT until September 2021.

19. GRBP was informed about the progress of the Task Force on Studded Tyres (TF ST) and of the group of interested experts (GOIE) on snow tyres provisions (GRBP-72-15 and GRBP-72-23, respectively).