GAR | WT-26-04

WT-26-04

UN R117: Proposal to amend document GRBP/2021/12

Source(s)

Date

8 Sep 2021

Status

Subject

UN R117 Tire Noise, Wet Adhesion, and Rolling Resistance

Meeting(s)

WT | Session 26 | 8 Sep 2021

Proposal to maintain the performance stages for the following reasons:

By removing the performance stages, we would allow two different markings, with and without performance stage indication, for the same actual performance level depending on whether the type approval was granted according the 02 or 03 series of amendments.
Some countries which are not contracting parties of 1958 Agreement refer to stage 1 and stage 2 of 02 series of amendments of UN Regulation No. 117. Therefore, the removal of the stages would create some ambiguity and misunderstanding of the actual performance of the product.
The above is even more important for tyre of classes C2 and C3 as they are not affected by the introduction of the performance for the adhesion on wet surfaces for tyres in worn state, and for which the suffix B is not added to the approval marking.

Downloads

UNECE server

Related documents

Excerpts from session reports

GRBP | Session 75 | 8-11 Feb 2022

21. GRBP recalled that, at the previous session, it had adopted draft amendments on the procedure and thresholds on wet grip performance for C1 tyres in worn state which was subsequently submitted to WP.29 as draft 03 series of amendments to UN Regulation No. 117 (ECE/TRANS/WP.29/2021/12). To complement the document, the expert from IWG WGWT tabled further amendments (GRBP-75-25-Rev.1). GRBP adopted this proposal and requested the secretariat to submit it for consideration and vote at the June 2022 sessions of WP.29 and AC.1 as part of a new 03 series of amendments to UN Regulation No. 117. The expert from IWG WGWT also presented a concept proposal for addressing wet grip requirements for C2 and C3 tyres in worn state (GRBP-75-26-Rev.1).

22. GRBP agreed to request WP.29 and AC.1 to postpone to their June 2022 sessions consideration of ECE/TRANS/WP.29/2021/12, in order to combine it into a consolidated proposal with the adopted amendments mentioned in the previous paragraph.

GRBP | Session 74 | 15-17 Sep 2021

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.