Working Party on Noise and Tyres | Session 73 | 26-29 Jan 2021
Geneva
Agenda Item 5. (d)
UN Regulation No. 117 (Tyre rolling resistance, rolling noise and wet grip)

15. On behalf of IWG for Wet Grip on Worn Tyres (WGWT), the expert of France reported on their progress (GRBP-73-18).

16. The expert from EC proposed to include C2 and C3 tyres in the Terms of Reference of IWG WGWT (GRBP-73-02). The expert from ETRTO presented a preliminary assessment of wet grip on worn C2 and C3 tyres (GRBP-73-22) and suggested further modifications to the Terms of Reference (GRBP-73-08). Based on a consolidated proposal in GRBP-73-27-Rev.1, GRBP adopted revised Terms of Reference of IWG WGWT as laid down in Annex III to the session report.

17. The expert from ETRTO proposed to introduce in UN Regulation No.117 a definition of “ice tyre” for C1 tyres (GRBP-73-19). The Chair invited ETRTO to submit a working document for consideration at the next session.

Documentation
GRBP-72-02 Worn tyres: Proposal for working group terms of reference (EC)
GRBP-73-02 Proposal to amend the Worn Tyres informal working group Terms of Reference (EC)
GRBP-73-08 Proposal to amend the Worn Tyres working group terms of reference (ETRTO)
GRBP-73-11 ETRTO Tyre Performance Study (ETRTO)
GRBP-73-18 Status report of the Worn Tyres working group
GRBP-73-19 UN R117: Proposal to introduce an Ice Tyre definition for C1 class tyres (ETRTO)
GRBP-73-22 Tyre industry preliminary assessment of wet grip on worn C2 and C3 tyres (ETRTO)
GRBP-73-27/Rev.1 Working group on Worn Tyres: Proposal for revised terms of reference (EC, ETRTO, and France)
GRBP/2019/14 UN R117: Proposal for a Supplement to the 02 series of amendments
GRBP/2020/11 UN R117: Proposal for revised Terms of Reference of the IWG WGWT (Wet Grip Performance for Tyres in a Worn State)
GRBP/2020/16 UN R117: Proposal for amendment (ETRTO)
GRBP/2020/17 UN R117: Proposal for amendment (ETRTO)