Working Party on Brakes and Running Gear | Session 76 | 17-21 Feb 2014
Geneva
Agenda Item 7. (b)
Regulation No. 117

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.

Documentation
GRRF-76-05 Japan comment for R117-02 C3 threshold
GRRF-76-07 Proposal for amendments to ECE/TRANS/WP.29/2013/66 (Supplement 5 to the 02 series of Regulation No. 117) (Denmark and Netherlands)
GRRF-76-08 Proposal for amendments to ECE/TRANS/WP.29/2013/66 (Supplement 5 to the 02 series of Regulation No. 117) (Denmark, Germany, and Netherlands)
GRRF-76-11 Proposal for amendments to ECE/TRANS/WP.29/2013/66 (Supplement 5 to the 02 series of Regulation No. 117) (EC)
GRRF-76-12 Summary of the ad hoc meeting on R117 C2 and C3 tyres Wet Grip thresholds (EC)
GRRF-76-26 Proposal for Supplement 6 to the 02 series of amendments to UN Regulation No. 117 (Russia, UTAC, ETRTO, and NAMI)
GRRF-76-26 Proposal for Supplement 6 to the 02 series of amendments to UN Regulation No. 117 (Russia, UTAC, ETRTO, and NAMI)
GRRF-76-27 Method of Deceleration Measuring and Data Processing for Tyre Rolling Resistance Determination (NAMI and UTAC)
GRRF-76-28 Method of Deceleration Measuring and Data Processing for Tyre Rolling Resistance Determination (NAMI and UTAC)
WP.29-162-05 Proposal for amendments to the draft Supplement 6 to the 02 series of amendments to Regulation No. 117
WP.29/2013/66 Proposal for Supplement 6 to the 02 series of amendments to Regulation No. 117