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24. Recalling the purpose of ECE/TRANS/WP.29/2013/66, the Chair of GRRF stressed that WP.29 was expecting GRRF to conclude its deliberation about the wet grip limit values. The GRRF experts introduced their positions (GRRF-76-05, GRRF-76-07, GRRF-76-08, GRRF-76-11, GRRF-76-12, GRRF-76-26, GRRF-76-27, GRRF-76-28). The expert from the EC reported on the concerns expressed by the Directorate-General for Mobility and Transport of the European Commission (DG Move). GRRF confirmed the limit values proposed in para. 6.2.2. for Tyres of C2 category and agreed to amend the proposed limit values in para. 6.2.3. for Tyres of C3 category in ECE/TRANS/WP.29/2013/66. GRRF requested the secretariat to submit this amendment as reproduced in WP.29-162-05 to WP.29 and AC.1 for consideration at their March 2014 session.
24bis. The expert from the Russian Federation presented GRB-59-02 proposing a tyre rolling resistance test results evaluation using a mathematical algorithm, to be added as an alternative to the existing one in the text of the Regulation. He also presented the results of a validation study of the proposed algorithm for tyres of the C1 category performed in France, in cooperation with the Russian Federation (GRB-59-07 and GRB-59-08). GRRF noted that this proposal may be submitted by GRB to WP.29 as a supplement to UN Regulation No. 117. GRRF recommended further steps for a better understanding of the proposed method’s sensitivity, suggesting: (i) extending the validation study for tyres of categories C2 and C3 and (ii) verifying the application of the proposed alternative in the conditions of the conformity of production. The GRRF Chair invited the experts to provide their comments on the proposal to the GRB secretariat with a copy to the expert from the Russian Federation.
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GRRF-76-05 | Japan comment for R117-02 C3 threshold
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Japan comment for R117-02 C3 threshold
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Reference Number: GRRF-76-05
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Pursuant to discussions on setting uniform wet-grip requirements for C3 snow tires, Japan affirms that its national data supports a minimum wet-grip value of 0.65 (as proposed in document WP.29/2013/66: Proposal for Supplement 5 to the 02 series of amendments).
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Document date: 15 Jan 14
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Relevant to
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View full document file for more information
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GRRF-76-07 | Proposal for amendments to ECE/TRANS/WP.29/2013/66 (Supplement 5 to the 02 series of Regulation No. 117)
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Proposal for amendments to ECE/TRANS/WP.29/2013/66 (Supplement 5 to the 02 series of Regulation No. 117)
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Reference Number: GRRF-76-07
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Proposal to maintain a wet grip index of 0.95 for class C2 normal tires and regular snow tires under the discussions to establish wet grip provisions and testing procedures for category C2 and C3 tires.
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Submitted by: Denmark and Netherlands
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Document date: 24 Jan 14
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Document status: Superseded
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Relevant to
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View full document file for more information
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GRRF-76-08 | Proposal for amendments to ECE/TRANS/WP.29/2013/66 (Supplement 5 to the 02 series of Regulation No. 117)
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Proposal for amendments to ECE/TRANS/WP.29/2013/66 (Supplement 5 to the 02 series of Regulation No. 117)
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Reference Number: GRRF-76-08
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Proposal to maintain a wet grip index of 0.65 for class C3 normal tires and regular snow tires under the discussions to establish wet grip provisions and testing procedures for category C2 and C3 tires.
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Submitted by: Denmark, Germany, and Netherlands
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Document date: 24 Jan 14
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Document status: Superseded
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Relevant to
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View full document file for more information
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GRRF-76-11 | Proposal for amendments to ECE/TRANS/WP.29/2013/66 (Supplement 5 to the 02 series of Regulation No. 117)
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Proposal for amendments to ECE/TRANS/WP.29/2013/66 (Supplement 5 to the 02 series of Regulation No. 117)
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Reference Number: GRRF-76-11
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European Commission proposal for minimum wet grip limits on Class C3 tyres. The EC notes that the wet grip (G) index is intended as a precautionary measure that would set a minimum level already satisfied by products currently on the market. In anticipation of improvements in new tires, the EC proposes to add a notation “Wet grip index (G) ≥ 0.80 may be considered for new types of tyres 96 months after the entry into force date of Supplement 5 to the 02 series of amendments, based on robust field data and cost-effectiveness analysis.”
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Submitted by: EC
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Document date: 30 Jan 14
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Relevant to
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View full document file for more information
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GRRF-76-12 | Summary of the ad hoc meeting on R117 C2 and C3 tyres Wet Grip thresholds
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Summary of the ad hoc meeting on R117 C2 and C3 tyres Wet Grip thresholds
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Reference Number: GRRF-76-12
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Report of the special meeting held in Paris on 21 November 2013 to discuss wet grip values for Class C2 and C3 tyres.
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Submitted by: EC
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Document date: 30 Jan 14
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Relevant to
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View full document file for more information
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GRRF-76-26 | Proposal for Supplement 6 to the 02 series of amendments to UN Regulation No. 117
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Proposal for Supplement 6 to the 02 series of amendments to UN Regulation No. 117
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Reference Number: GRRF-76-26
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Proposal to elaborate on the concept of tyre deceleration (dω/dt) in the test procedures. The Russian Federation has developed a “Deceleration Calculator” for use in the UN R117 procedures. Following work by an ad hoc group (including NAMI, UTAC, and ETRTO) formed to review and validate this tool, Russia has prepared this new proposal, modifying the version (document GRB/2013/10) submitted at the last GRB session. The changes primarily concern the explanation of the tool rather than the basic mathematical equations.
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Submitted by: Russia, UTAC, ETRTO, and NAMI
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Document date: 12 Feb 14
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Document status: Superseded
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Relevant to
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View full document file for more information
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GRRF-76-28 | Method of Deceleration Measuring and Data Processing for Tyre Rolling Resistance Determination
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Method of Deceleration Measuring and Data Processing for Tyre Rolling Resistance Determination
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Reference Number: GRRF-76-28
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Full report of the ad hoc group on the development of the method for determining tire rolling resistance using the variant dω/dt method.
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Submitted by: NAMI and UTAC
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Document date: 12 Feb 14
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Relevant to
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View full document file for more information
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WP.29-162-05 | Proposal for amendments to the draft Supplement 6 to the 02 series of amendments to Regulation No. 117
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Proposal for amendments to the draft Supplement 6 to the 02 series of amendments to Regulation No. 117
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Reference Number: WP.29-162-05
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Submission of the wet grip limit values for Class C3 tires as agreed to within the Working Party on Brakes and Running Gear (GRRF). These values were originally proposed in document WP.29/2013/66.
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Document date: 24 Feb 14
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Document status: Adopted text published
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Relevant to
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View full document file for more information
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WP.29/2013/66 | Proposal for Supplement 6 to the 02 series of amendments to Regulation No. 117
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Proposal for Supplement 6 to the 02 series of amendments to Regulation No. 117
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Reference Number: WP.29/2013/66
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Text as adopted by the Working Party on Brakes and Running Gear (GRRF) at its 75th session based upon a proposal by the European Commission, France and ETRTO to introduce wet grip provisions and testing procedures for tyres of categories C2 and C3.
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Document date: 17 Apr 13
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Document status: Adopted text published
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Relevant to
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View full document file for more information
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GRRF-76-27 | Method of Deceleration Measuring and Data Processing for Tyre Rolling Resistance Determination
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Method of Deceleration Measuring and Data Processing for Tyre Rolling Resistance Determination
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Reference Number: GRRF-76-27
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Report of the ad‐hoc working group organized in accordance with the recommendation of the 58th GRB session to consider testing and evaluation of the variant method using the dω/dt form proposed by Russia.
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Submitted by: NAMI and UTAC
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Document date: 12 Feb 14
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Relevant to
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View full document file for more information
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