Proposal to add requirement on the monitoring of the machine deviation for rolling resistance measurement.

This revised document intended to present to amend 117 the timetable for the work related to Regulation No. 117 has been shifted with approximately 12 months for this part.
The aim of the IWG is to propose harmonized measures for evaluating systematic errors and random errors to improve the test procedures to reduce measurement uncertainties

IWG WGWT proposes to amend document ECE/TRANS/WP.29/GRBP/2021/12

IWG to propose amendments to UN R117

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

Proposal to introduce provisions for ice grip tyres, clarify Conformity of Production, sample submissions, and testing methods, and to make editorial corrections and improvements.