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| Document Title | UN R117: Proposal for a 04 series of amendments | ||||||||
| Reference Number | GRBP/2022/23 | ||||||||
| Date |
16 Jun 2022
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| Summary | Proposal from the Worn Tyres working group to set the wet grip index threshold at 0.80 for class C1 tyres with a nominal aspect ratio equal to or less than 40, a section width equal to or higher than 235 mm and suitable for speeds equal to or greater than 300 km/h and for class C1 all terrain and special use tyres (see GRBP-75-27, slide 6). The proposal also introduces the kworn factor in a new para. 3 in Annex 9 to address wet grip of C2 and C3 tyres in a worn state (see GRBP-75-26-Rev.1 for concept). | ||||||||
| Rulemaking Area(s) | UN R117 Tire Noise, Wet Adhesion, and Rolling Resistance | ||||||||
| Proposal Status | Superseded | ||||||||
| Meeting(s) | |||||||||
| Related Documents | |||||||||
| GRBP-75-26/Rev.1 | UN R117: Presentation on the concept for addressing wet grip on worn tyre requirements for C2 and C3 tyres | ||||||||
| GRBP-75-27 | UN R117: IWG Wet Grip on Worn Tyres - status report | ||||||||
| WT-44-06/Rev.1 | UN R117: Draft text for an informal document to amend document GRBP/2022/23 | ||||||||
| GRBP-76-02 | UN R117: Proposal to amend document GRBP/2022/23 (superseded) | ||||||||
| GRBP-76-24/Rev.1 | UN R117: Proposal for amendment to proposal for the 04 series of amendments (superseded) | ||||||||
| GRBP-76-33/Rev 1 | UN R117: Proposal to amend proposal for 04 series of amendments (superseded) | ||||||||
| GRBP/2023/3 | UN R117: Proposal for amendments to the 04 series of amendments | ||||||||
| WP.29/2023/8 | UN R117: Proposal for the 04 series of amendments (adopted) | ||||||||
| Downloads | |||||||||
| UNECE server | .pdf format | .docx format | |||||||
| Excerpts from session reports related to this document | |||||||||
| GRBP | Session 76 | 5-7 Sep 2022 |
20. The expert of IWG WGWT presented their proposals for the moulded standard reference test tyre and wet grip of C2, C3, and some clusters of C1 tyres in a worn state (ECE/TRANS/WP.29/GRBP/2022/22, ECE/TRANS/WP.29/GRBP/2022/23, GRBP-76-02 and GRBP-76-05). The expert from ETRTO introduced additional amendments (GRBP-76-24-Rev.1, GRBP-76-33-Rev.1 and GRBP-76-34). 21. GRBP adopted ECE/TRANS/WP.29/GRBP/2022/22, as amended by GRBP-76-05 and GRBP-76-34, subject to the removal of the square brackets, and requested the secretariat to submit it for consideration and vote at the March 2023 sessions of WP.29 and AC.1 as draft Supplement 1 to the 03 series of amendments to UN Regulation No. 117. 22. GRBP adopted ECE/TRANS/WP.29/GRBP/2022/23, as amended by GRBP-76-02, GRBP-76-33-Rev.1, and GRBP-76-24-Rev.1, and requested the secretariat to submit it for consideration and vote at the March 2023 sessions of WP.29 and AC.1 as part of the draft new 04 series of amendments to UN Regulation No. 117. |
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