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| Document Title | UN R117: Proposal for the 04 series of amendments | ||||||||
| Reference Number | WP.29/2023/8 | ||||||||
| Date |
19 Dec 2022
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| Summary | Proposal to revise the limits for rolling resistance and wet grip, to address tyres for vintage vehicles, to revise the definition for special-use C1 tyres, and 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. 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), provisions to allow the type approval of special use tyres that fulfil the requirements for snow performance as laid out in Annex 7, and a new definition of traction elements to characterize traction tyres. | ||||||||
| Rulemaking Area(s) | UN R117 Tire Noise, Wet Adhesion, and Rolling Resistance | ||||||||
| Regulatory Impact |
04 series of amendments
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| Proposal Status | Adopted by WP.29 | ||||||||
| Meeting(s) | |||||||||
| Related Documents | |||||||||
| GRBP/2022/12 | UN R117: Proposal for the 04 series of amendments (superseded) | ||||||||
| GRBP-76-23 | UN R117: Proposal for amendments to the proposal for 04 series of amendments (superseded) | ||||||||
| GRBP-76-32 | UN R117: Proposal to amend the proposal for the 04 series of amendments (superseded) | ||||||||
| GRBP/2022/23 | UN R117: Proposal for a 04 series of amendments (superseded) | ||||||||
| GRBP-76-02 | UN R117: Proposal to amend document GRBP/2022/23 (superseded) | ||||||||
| GRBP-76-33/Rev 1 | UN R117: Proposal to amend proposal for 04 series of amendments (superseded) | ||||||||
| GRBP-76-24/Rev.1 | UN R117: Proposal for amendment to proposal for the 04 series of amendments (superseded) | ||||||||
| GRBP/2022/17 | UN R117: Proposal for the 04 series of amendments (superseded) | ||||||||
| Downloads | |||||||||
| UNECE server | .pdf format | .docx format | |||||||
| Excerpts from session reports related to this document | |||||||||
| WP.29 | Session 189 | 6-9 Mar 2023 | |||||||||