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UN R117: Proposal for Supplement 2 to the 03 series of amendments
Document WP.29/2024/72
9 April 2024

Proposal to improve the reproducibility of the snow grip test method by replacing the current reference tyres C3 SRTTs 19.5 and 22.5 with the new reference tyres C3 SRTTs 19.5 and 22.5 siped, to make editorial improvements and updates to ISO and ASTM standards references, and to align with Supplement 2 to the 04 series of amendments, including a new temperature correction formula for the rolling sound emissions of tyres of classes C1 and C2 and to remove the content of the now obsolete Annex 4 as well as all its references.

Status: WP.29 amended and adopted
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Previous Documents, Discussions, and Outcomes
4.9.11. | Proposal for Supplement 2 to the 03 series of amendments to UN Regulation No. 117 (Tyre rolling resistance, rolling noise and wet grip)
7. (d) | UN Regulation No. 117 (Tyre rolling resistance, rolling noise and wet grip)

23. The expert of ETRTO submitted proposals for a new Supplement to the 03 series of amendments with the aim to introduce editorial corrections, a temperature correction to decrease measurement uncertainties and the new C3 reference test tyres (ECE/TRANS/WP.29/GRBP/2024/9, ECE/TRANS/WP.29/GRBP/2024/12, GRBP-79-22). The experts from France and Japan commented on the proposals (GRBP-79-49 and GRBP-79-08). GRBP adopted the proposals in ECE/TRANS/WP.29/GRBP/2024/9 as amended by GRBP-79-22 and in ECE/TRANS/WP.29/GRBP/2024/12 as amended by GRBP-79-49 and requested the secretariat to submit them for consideration and vote at the June 2024 sessions of WP.29 and AC.1 as draft Supplement 2 to the 03 series of amendments to UN Regulation No. 117.

7. (f) | Tyre abrasion
Related and Previous Documents
GRBP/2024/9
GRBP-79-22
GRBP/2024/12
GRBP-79-49
Relates to UN R117 |