21. The expert of France proposed a wet adhesion requirement for C1 tyres in a worn state (ECE/TRANS/WP.29/GRB/2019/6 and GRB-69-08). The proposal received comments from ETRTO (GRB-69-10). GRB also noted a recent study on used tyres (GRB-69-09). GRB was of the view that this topic should be pursued in the framework of a new IWG and adopted its Terms of Reference (GRB-69-23), as reproduced in Annex V to the session report. Various experts expressed their willingness to contribute to the activities of the newly established IWG. The experts from France and the European Commission volunteered to act as Chair and Co-Chair, respectively, while ETRTO agreed to provide secretariat support.

Highlighting of the changes in the proposal to ensure that that P-type tyres can be distinguished from non-P-type tyres to support understanding of the proposal.

16. The experts from ETRTO proposed to clarify and improve the text of UN Regulation No. 30 (ECE/TRANS/WP.29/GRB/2019/5 and GRB-69-11-Rev.1). GRB adopted the proposal, as amended by Annex III of the session report, and requested the secretariat to submit it to WP.29 and AC.1 for consideration and vote at their June 2019 sessions as a draft Supplement 21 to the 02 series of amendments to UN Regulation No. 30. GRB also requested the secretariat, in cooperation with ETRTO, to use this opportunity to consolidate the text of the UN Regulation.

ETRTO response to UK question on the availability of extended mobility tyres (EMT) on the market.

17. GRB resumed consideration of the ETRTO proposals for amendments to UN Regulations Nos. 30 and 64 which introduce provisions on extended mobility tyres (EMT) (ECE/TRANS/WP.29/GRVA/2018/6, ECE/TRANS/WP.29/GRVA/2018/7 and GRB-68-14). In reply to the questions raised at the previous session, the expert of ETRTO presented GRB-69-12. GRB adopted the proposals and requested the secretariat to submit them to WP.29 and AC.1 for consideration and vote at their June 2019 sessions as a draft Supplement 21 to the 02 series of amendments UN Regulation No. 30 and a draft Supplement 1 to the 03 series of amendments to UN Regulation No. 64.

25. GRB received a status report from IWG on Tyre GTR (GRB-69-17) and took note of a list of the proposed draft amendments (GRB-69-21 and GRB-69-22). GRB noted that a formal proposal might be submitted to the next session.

25. GRB received a status report from IWG on Tyre GTR (GRB-69-17) and took note of a list of the proposed draft amendments (GRB-69-21 and GRB-69-22). GRB noted that a formal proposal might be submitted to the next session.

E-mail from RDW (DETA informal group chair) conveying questions and comments from ETRTO to GTB.

Input for the Group of Interested Experts (GOIE) meeting.

Proposal to:

1. include the load variation with speed for IF and VF tyres in Table A of Annex 7
introduce a new paragraph (2.18.13) and amend paragraph 3.1.9.and Annex 3,part D to reconcile contradictions
2. clarify Annex 6 “Test method for measuring tyre dimensions” via references to other provisions
3. Correct example in Annex 3, part C by introducing the dimension “b” for the tyre size designation, and
4. Modify inflation pressure markings.

10. The expert from ETRTO introduced draft amendments (ECE/TRANS/WP.29/GRBP/2019/18). GRBP adopted the amendments and requested the secretariat to submit them to WP.29 and AC.1 for consideration and vote at their March 2020 sessions as a draft Supplement 18 to the original series of amendments to UN Regulation No. 106.

Proposal for an amendment to complement the content of working document GRVA/2018/5. The proposal includes amendments to:

1. The Standard Reference Test Tyre (SRTT) denominations
2. Remove the discrimination between the two Class C3 tyres
3. Clarify that there are no C3 tyres in the scope of this UN Regulation “not marked with speed symbol”
4. Align Annex 6 with the most recent amendments made to standard ISO 28580
5. Define “standard deviation” as appropriate in the text
6. Clarify that, in the cases of C2 and C3 tyres, the “Reference (test) pressure” and the value “Pr” correspond to the indication of the inflation pressure which is always marked on the sidewall
7. Use “repeatability” in lieu of inaccurate “reproducibility”
8. Update test report forms
9. Include the date on which the new proposed supplement of UN Regulation No. 117 will apply
10. Improve the description of the evaluation of the rolling sound emission test
Correct the figure in Annex 2, Appendix 2, and
11. Update cross references pursuant to paragraph renumbering.

14. The expert from ETRTO recalled the postponed proposal for amendments (ECE/TRANS/WP.29/GRVA/2018/5 and GRB-68-12) and presented complementary modifications (ECE/TRANS/WP.29/GRBP/2019/19, GRBP-70-21-Rev.2). Various experts posed clarifying questions, in particular, on the use of terms “repeatability” and “reproducibility”. Following an in-depth discussion, GRBP adopted the proposals, as amended by Annex III, and requested the secretariat to submit them to WP.29 and AC.1 for consideration and vote at their March 2020 sessions as a draft Supplement 11 to the 02 series of amendments to UN Regulation No. 117.

14. The expert from ETRTO recalled the postponed proposal for amendments (ECE/TRANS/WP.29/GRVA/2018/5 and GRB-68-12) and presented complementary modifications (ECE/TRANS/WP.29/GRBP/2019/19, GRBP-70-21-Rev.2). Various experts posed clarifying questions, in particular, on the use of terms “repeatability” and “reproducibility”. Following an in-depth discussion, GRBP adopted the proposals, as amended by Annex III, and requested the secretariat to submit them to WP.29 and AC.1 for consideration and vote at their March 2020 sessions as a draft Supplement 11 to the 02 series of amendments to UN Regulation No. 117.

17. The expert from ETRTO provided an update of tyre industry and ISO activities on improving the wet grip test method for passenger car tyres (C1) (GRBP-70-20) and indicated his intention to submit a working document to the next session of GRBP. The Chair encouraged GRBP experts to send their comments to ETRTO.

18. The expert of ETRTO pointed out the need for a new definition of “traction tyres”, because the current definition did not well segregate real traction tyres from non-traction ones (GRBP-70-19). The experts from OICA commented on the document. The Chair invited ETRTO, in cooperation with OICA, to prepare a formal proposal for consideration at the next session.

In document GRRF/2016/40, an ellipsis “…”, indicating that the remainder of the sentence was to be retained, was omitted in the proposed amendment to paragraph 3.2.1. As a result, the remaining text was unintentionally removed following adoption of the proposal. A similar error resulted from the adoption of document WP.29/2017/9 regarding paragraph 4.9.2. This proposal also reintroduces the unintentionally deleted text.

16. The expert of BIPAVER proposed to restore several sentences which had been deleted by mistake in documents ECE/TRANS/WP.29/GRRF/2016/40 and ECE/TRANS/WP.29/2017/9 (ECE/TRANS/WP.29/GRBP/2020/4). GRBP adopted the correction and requested the secretariat to submit it to WP.29 and AC.1 for consideration and vote at their June 2020 sessions as Supplement 10 to UN Regulation No. 109.

Proposal to align definitions across tyre regulations and align the regulations with technological progress (see document GRRF-82-21), correct an editorial error, and clarify that the ply rating is not applicable to T-type temporary use tyres.

12. The expert from ETRTO introduced a new Supplement to UN Regulation No. 30 and an accompanying transitional provision (paragraph 11.4.) that would delay for three months the mandatory application of the Supplement (ECE/TRANS/WP.29/GRBP/2020/3). In particular, he proposed excluding tyres with radial and run flat structure from the dimensional requirements after the load speed endurance test (GRBP-71-07). Various experts commented on the proposal and suggested modifications (GRBP-71-30). Finally, GRBP adopted the proposal, as contained in Annex VI, and requested the secretariat to submit it to WP.29 and AC.1 for consideration and vote at their June 2020 sessions as Supplement 22 to the 02 series of amendments to UN Regulation No. 30.

13. GRBP noted that the adopted transitional provision 11.4. does not contradict the WP.29 Guidelines for regulatory procedures and transitional provisions in UN Regulations (ECE/TRANS/WP.29/1044/Rev.2). At the same time, several GRBP experts expressed concerns about the rationale given by ETRTO for this provision which was the delays in issuance by the United Nations Office for Legal Affairs (OLA) of depository notifications about the entry into force of amendments to UN Regulations. GRBP was of the view that this is a general problem that affects all UN Regulations and other WP.29 Working Parties as well. Therefore, GRBP requested the Chair to raise this issue at the next session of the Administrative Committee for Coordination of Work (AC.2).