Since these proposals require review by GRB at its September session, they are on the agenda for reference only and will not be considered before the November session of the Forum.

17. Referring to the report of the Working Party on Brakes and Running Gear (GRRF) (see ECE/TRANS/WP.29/GRRF/72, paras. 25 and 32-34), GRB considered ECE/TRANS/WP.29/2012/54 and ECE/TRANS/WP.29/2011/55, proposing to add specific performance requirements for C2 snow tyres and amending the definition of the measuring rim for C1, C2 and C3 tyres. GRB endorsed ECE/TRANS/WP.29/2012/55 without amendment, scheduled to be considered by WP.29 and AC.1 at their November 2012 sessions. Concerning ECE/TRANS/WP.29/2012/54, GRB considered GRB-56-15 tabled by the expert from Germany, proposing to introduce the inscription “M+S” or “M.S” or “M&S” only in combination with the “Alpine” symbol on a mandatory basis, if the tyre be classified as a “snow tyre for use in severe snow conditions”. Accordingly, GRB endorsed ECE/TRANS/WP.29/2012/54, as amended by Annex III to this report and agreed to submit it to WP.29 and AC.1, for consideration at their November 2012 sessions as draft Supplement 2 to the 02 series of amendments, subject to a final review by GRRF at its September 2012 session.

18. The expert from ETRTO introduced ECE/TRANS/WP.29/GRB/2012/10 aligning the text of Annex 6 of the UN Regulation to ISO Standard 28580. GRB adopted the proposal not amended and agreed to submit it to WP.29 and AC.1, for consideration at their March 2013 session as draft Supplement 3 to the 02 series of amendments to UN Regulation No. 117, also subject to a final review by GRRF at its September 2012 session (see ECE/TRANS/WP.29/GRRF/2012/18).

19. The expert from ETRTO proposed to amend the snow test method for C3 tyres (ECE/TRANS/WP.29/GRB/2012/11). However, GRB argued that some of the proposed amendments could conflict with the recommended introduction of blocking differential on driven axle as increasing repeatability in the test. GRB agreed to resume consideration of the proposal at its next session on the basis of an official document submitted to the March 2013 sessions of WP.29 and AC.1, incorporating possible changes (see ECE/TRANS/WP.29/GRRF/2012/19) agreed by GRRF at its September 2012 session.

20. The expert from the Netherlands introduced ECE/TRANS/WP.29/GRB/2012/15 and ECE/TRANS/WP.29/GRB/2012/18 updating the test track provisions to ISO 10844:2011. The expert from ETRTO introduced similar amendments (ECE/TRANS/WP.29/GRB/2012/9) but without transitional provisions. GRB agreed that the introduction of new provisions for the test track should refer to a new series of amendments of the UN Regulation. Following the suggestion of the Chair and Vice-Chair, GRB considered GRB-56-20 (superseding ECE/TRANS/WP.29/GRB/2012/15, ECE/TRANS/WP.29/GRB/2012/18 and ECE/TRANS/WP.29/GRB/2012/9) drafted in accordance with ECE/TRANS/WP.29/1044/Rev.1 “Guidelines on the scope, administrative provisions and alternative requirements in Regulations annexed to the 1958 Agreement”. GRB requested the secretariat to distribute GRB-56-20 with an official symbol at its February 2013 session and agreed to refer to it as a basis to continue discussion on this subject.

21. Finally, GRB considered GRB-56-02 tabled by the expert from the Russian Federation aimed at providing detailed elaboration of the concept of tyre deceleration (dω/dt) in the test technology. The secretariat was requested to distribute it with an official symbol at its February 2013 session, pending the clarification of the reference to the “deceleration calculator” mentioned in the proposal.

The amendments to paragraph 4.2.6, shall be deleted.

The new paragraph 4.2.6.1, shall be renumbered as paragraph 4.2.6 and amended to read:

“4.2.6. The “Alpine” symbol (“3-peak-mountain with snowflake” conforming to the symbol described in Annex 7, Appendix 1) shall be added if the snow tyre is classified as “snow tyre for use in severe snow conditions”."

Paragraphs 6.1.2 and 6.1.3, the tables, remove the square brackets and keep the figures.

Annex 7, the amendment to Appendix 1, correct to read:
“Minimum 15 mm base and 15 mm height.”

Proposal unanimously adopted with these amendments.

26. The Chair recalled the purpose of ECE/TRANS/WP.29/2012/54 harmonizing the definitions of “snow tyres” and “snow tyres for use in severe snow conditions” in UN Regulations Nos. 30, 54 and 117, for further consideration by GRB. The Chair of GRB presented GRRF-73-05, a proposal generated by GRB during its session in September 2012 which slightly modifies the GRRF proposal. GRB preferred to remove the marking M+S from UN Regulation No. 117. Only “snow tyres for severe condition” with the “Alpine Marking” are entitled to the bonus on limit values set in the Regulation (e.g. for “rolling noise”). GRRF endorsed the proposal by GRB as reproduced in GRRF-73-05-Rev.1 and agreed to submit it to WP.29 and AC.1 for consideration at their November 2012 sessions together with ECE/TRANS/WP.29/2012/54 as Supplement 02 to the 02 series of amendments to UN Regulation No. 117 (see WP.29-158-09).

27. The expert from ETRTO introduced ECE/TRANS/WP.29/GRRF/2012/17 amending UN Regulation No. 117, introducing the possibility to use a test track according to the new ISO standard 10844:2011. The expert from ETRTO preferred to insert transitional provisions into the proposed amendments (GRRF-73-26). GRRF endorsed the amendments proposed by GRB (GRRF-73-17) and confirmed there was no conflict with on-going amendments under consideration at GRRF.

28. The expert from ETRTO introduced ECE/TRANS/WP.29/GRRF/2012/18 correcting the provisions of the temperature compensation in Regulation No. 117. GRRF noted that this proposal had been simultaneously transmitted to GRB who had made recommendations for submission to WP.29 and AC.1 for consideration at their March 2013 sessions as Supplement 03 to the 02 series of amendments to UN Regulation No. 117.

29. The expert from ETRTO introduced ECE/TRANS/WP.29/GRRF/2012/19 amending the testing procedure for snow tyres of the category C3. GRRF noted some comments. GRRF agreed to consider a revised proposal at its next session

30. The expert of France presented a joint proposal of France / EC (GRRF-73-08) on wet grip testing provisions for Tyres of category C2 and C3. The expert from ETRTO introduced GRRF-73-18 and GRRF-73-21 in response to GRRF-73-08 with a proposal for limit values as well as transitional provisions. GRRF agreed to resume discussion on these issues on the basis of revised proposals tabled by ETRTO at its next session.