Download: GRBP/2026/1 from UNECE: .pdf format .docx format
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5. (e) UN Regulation No. 117 (Tyre Rolling Resistance, Rolling Noise and Wet Grip)

GRBP will be briefed on the activities of the Informal Working Group on Wet Grip Performance of Tyres in Worn State (IWG WGWT).

GRBP-83-31 | Wet Grip on Worn Tyres informal group status report to GRBP

GRBP will consider updates for the reference years in international standard specifications that were tabled by the experts from ETRTO.

GRBP/2026/6 | UN R117: Proposal for a Supplement 4 to the 04 series of amendments
GRBP-83-20/Rev.2 | UN R117: Proposal to amend document GRBP2026/6

As agreed at its previous session, GRBP will revert to the test requirements for ice grip tyres under the wet ice conditions (ECE/TRANS/WP.29/GRBP/80, para. 11).