Comments on draft UN R51.04 addressing various editorial and technical issues in Annexes 3, 6, 7, 8, and 9, including:

• Corrections to tyre conditioning text,
• Clarification of test speed tolerance,
• Changes to figure captions from ‘microphone point’ to ‘microphone position’,
• Corrections to formulas for anchor point parameters,
• Relocation of test report paragraph,
• Removal of unnecessary asterisk and footnote regarding ISO 10844 certification dates,
• Clarification of limit value specifications,
• Vehicle scope definitions,
• Definition necessity review,
• Incorporation of JASIC proposals for compliance assessment cases,
• Corrections to appendix references,
• Parameter reporting specifications,
• Adjustments to virtual engine speed calculations for hybrid electric vehicles.

Draft minutes of the 77th session of the Informal Working Group on Wet Grip of Worn Tyres held on 28 October 2026. The group reviewed and discussed preliminary conclusions from data analysis on test precision for worn tyre wet grip testing, including comments from JASIC and ETRTO. Discussion covered whether the obtained dispersion level of 0.071 is sufficient, the appropriateness of test campaign methodology, and the feasibility of achieving precision levels comparable to new tyre wet grip testing given the intrinsic variability from candidate tyre buffing and aquaplaning effects.

The Working Party on Noise and Tyres held its eighty-fourth session from 2-4 September 2026 in Geneva. GRBP adopted a draft new Supplement to the 02 series and a draft new Supplement to the 04 series of amendments to UN R117, and agreed to submit these to WP.29 and AC.1 for consideration and vote at their March 2027 sessions. GRBP adopted the content of a proposal for a new supplement to UN R64 and agreed to postpone submission to WP.29 until further notice. GRBP adopted revised Terms of Reference for the IWG on Real Driving-Additional Sound Emission Provisions with extended mandate until February 2028.

The Working Party on Noise and Tyres held its eighty-fourth session from 2-4 September 2026 in Geneva. GRBP adopted a draft new Supplement to the 02 series and a draft new Supplement to the 04 series of amendments to UN R117, and agreed to submit these to WP.29 and AC.1 for consideration and vote at their March 2027 sessions. GRBP adopted the content of a proposal for a new supplement to UN R64 and agreed to postpone submission to WP.29 until further notice. GRBP adopted revised Terms of Reference for the IWG on Real Driving-Additional Sound Emission Provisions with extended mandate until February 2028.