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GRBP: Annotated provisional agenda for the 76th (September 2022) session
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Document Reference Number: GRBP/2022/10
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Document date: 15 Jun 22
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GRBP/2022/10
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15 Jun 2022
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Working Party
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GRBP/2022/0010
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UN R164: Proposal for Supplement 1
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Description
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Proposal from the Studded Tyres task force to introduce provisions for C1 tyre ice-grip performance.
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Document Reference Number: GRBP/2022/11
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Document date: 15 Jun 22
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Document status: Formal GR review
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More information
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Related regulations or topics
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GRBP/2022/11
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15 Jun 2022
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Working Party
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Type Approval of Studded Tyres
Studded Tyres
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Proposal from the Studded Tyres task force to introduce provisions for C1 tyre ice-grip performance.
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GRBP/2022/0011
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UN R117: Proposal for a Supplement to the 03 series of amendments
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Description
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Proposal from the Worn Tyres working group to improve precision of the test procedures for measuring the wet adhesion of tyres in a worn state by using a moulded SRTT16 reference tyre (instead of a buffed tyre), to introduce new transitional provisions related to this change, to extend corrections already made to thee 02 series to the 03 series and make additional editorial corrections, and to define the range for tyre inflation vis-à-vis rim size to reduce uncertainties in measuring tread depth.
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Document Reference Number: GRBP/2022/22
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Document date: 16 Jun 22
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Document status: Formal GR review
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More information
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Related regulations or topics
Related documents
WT-44-05/Rev.1 | UN R117: Draft text for informal document to amend document GRBP/2022/22
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GRBP/2022/22
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16 Jun 2022
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Working Party
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Tire Rolling Sound Emissions, Adhesion on Wet Surfaces, and Rolling Resistance
Tire Noise, Wet Adhesion, and Rolling Resistance
Uniform provisions concerning the approval of tyres with regard to rolling sound emissions and/or to adhesion on wet surfaces and/or to rolling resistance
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Proposal from the Worn Tyres working group to improve precision of the test procedures for measuring the wet adhesion of tyres in a worn state by using a moulded SRTT16 reference tyre (instead of a buffed tyre), to introduce new transitional provisions related to this change, to extend corrections already made to thee 02 series to the 03 series and make additional editorial corrections, and to define the range for tyre inflation vis-à-vis rim size to reduce uncertainties in measuring tread depth.
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GRBP/2022/0022
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UN R117: Proposal for a 04 series of amendments
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Description
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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).
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Document Reference Number: GRBP/2022/23
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Document date: 16 Jun 22
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Document status: Formal GR review
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More information
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Related regulations or topics
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
Related discussions
20. The experts from the Informal Working Group for Wet Grip on Worn Tyres (WGWT) reported on their progress (GRBP-75-27) and presented updated Terms of Reference of IWG WGWT (GRBP-75-28). GRBP adopted the revised Terms of Reference, as contained in Annex III to the session report.
21. GRBP recalled that, at the previous session, it had adopted draft amendments on the procedure and thresholds on wet grip performance for C1 tyres in worn state which was subsequently submitted to WP.29 as draft 03 series of amendments to UN Regulation No. 117 (ECE/TRANS/WP.29/2021/12). To complement the document, the expert from IWG WGWT tabled further amendments (GRBP-75-25-Rev.1). GRBP adopted this proposal and requested the secretariat to submit it for consideration and vote at the June 2022 sessions of WP.29 and AC.1 as part of a new 03 series of amendments to UN Regulation No. 117. The expert from IWG WGWT also presented a concept proposal for addressing wet grip requirements for C2 and C3 tyres in worn state (GRBP-75-26-Rev.1).
22. GRBP agreed to request WP.29 and AC.1 to postpone to their June 2022 sessions consideration of ECE/TRANS/WP.29/2021/12, in order to combine it into a consolidated proposal with the adopted amendments mentioned in the previous paragraph.
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GRBP/2022/23
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16 Jun 2022
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Working Party
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Tire Rolling Sound Emissions, Adhesion on Wet Surfaces, and Rolling Resistance
Tire Noise, Wet Adhesion, and Rolling Resistance
Uniform provisions concerning the approval of tyres with regard to rolling sound emissions and/or to adhesion on wet surfaces and/or to rolling resistance
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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 k<sub>worn</sub> 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).
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GRBP/2022/0023
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