UN R117: Proposal for amendments
Download in .pdf format Download in .docx format

Proposal from the Worn Tyres working group to introduce a procedure and thresholds on wet grip performance for C1 tyres in worn state.

Reference Number: GRBP/2021/12
Date: 30 June 2021
Proposal Status: GR amended and approved
Related Documents:
GRBP-74-33/Rev.1 | UN R117: Proposal for amendments
WT-25-05 | Worn tyres working group revised terms of reference proposal
WT-25-04/Rev.1 | UN R117: 03 series (wet adhesion of C1-class tyres in worn state with buffed SRTTworn) transitional provisions draft
WT-26-03 | UN R117: Proposal to amend document GRBP/2021/12
WT-26-04 | UN R117: Proposal to amend document GRBP/2021/12
WT-27-03 | UN R117: Amendments to document GRBP/2021/12
WT-27-07 | UN R117: Proposal for amendments to GRBP/2021/12
Discussion(s):
Working Party on Noise and Tyres | Session 74 | 15-17 Sep

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.