Working Party on Noise and Tyres | Session 74 | 15-17 Sep 2021
Web conference
Agenda Item 7. (e)
UN Regulation No. 117 (Tyre rolling resistance, rolling noise and wet grip)

21. The expert of ETRTO tabled draft amendments that introduced an “ice grip tyre” definition and editorial corrections (ECE/TRANS/WP.29/GRBP/2021/17). GRBP adopted the proposal, as amended by GRBP-74-31-Rev.1, and requested the secretariat to submit it for consideration and vote at the March 2022 sessions of WP.29 and AC.1 as draft Supplement 14 to the 02 series of amendments to UN Regulation No. 117.

22. The experts from IWG for Wet Grip on Worn Tyres (WGWT) reported on their progress (GRBP-74-41) and presented updated Terms of Reference of IWG WGWT (GRBP-74-42). GRBP adopted the revised Terms of Reference, as contained in Annex V of the session report.

23. The expert from France, in her capacity of Co-Chair IWG WGWT, presented draft amendments that introduced a procedure and thresholds on wet grip performance for C1 tyres in worn state (ECE/TRANS/WP.29/GRBP/2021/12, as updated by GRBP-74-33-Rev.1). GRBP adopted GRBP-74-33-Rev.1 and requested the secretariat to submit it for consideration and vote at the March 2022 sessions of WP.29 and AC.1 as a new draft 03 series of amendments to UN Regulation No. 117. GRBP noted that, with the aim to complete the proposal and remove few square brackets, an informal document would be prepared for the next session. If adopted, this document would also be submitted to the March 2022 sessions of WP.29 and AC.1. GRBP noted that, to avoid possible uncertainty, the adopted draft Supplement 14 to the 02 series of amendments (see para. 21 above) would be explicitly included in the future WP.29 document with the new draft 03 series of amendments to UN Regulation No. 117.

24. GRBP considered GRBP-74-04 and invited the expert from France to liaise with the experts from ETRTO with the aim to prepare a working document for the next session.

Documentation
GRBP-74-04 UN R117: Proposal for amendments to the 02 series of amendments (France)
GRBP-74-12 IWG MU (Measurement Uncertainties): Terms of Reference
GRBP-74-31/Rev.1 UN R117: Proposal for amendments to the 02 series of amendments (ETRTO)
GRBP-74-33/Rev.1 UN R117: Proposal for amendments
GRBP-74-41 IWG WGWT: Status report
GRBP-74-42 IWG WGWT: Proposal for revised Terms of Reference
GRBP/2021/12 UN R117: Proposal for amendments
GRBP/2021/17 UN R117: Proposal for a Supplement to the 02 series of amendments (ETRTO)