31. GRRF reviewed ECE/TRANS/WP.29/2012/2 clarifying in Regulation No. 117 the current wet grip testing method and adding specific performance requirements for C3 snow tyres. GRRF agreed to go forward with the proposed agenda of the March 2012 session of WP.29, but to include some minor editorial corrections transmitted by the expert from ETRTO to the secretariat.

32. The expert from ETRTO recalled the purpose of GRRF-71-11 justifying the insertion of provisions for snow tyres of class C2 (ECE/TRANS/WP.29/GRRF/2011/29). GRRF adopted ECE/TRANS/WP.29/GRRF/2011/29 and agreed to submit it to WP.29 and AC.1, for consideration at their November 2012 sessions, as part (para. 25 above) of draft Supplement 2 to the 02 series of amendments to Regulation No. 117, subject to a final review by GRB and GRRF at their next sessions in September 2012.

33. The expert from France introduced ECE/TRANS/WP.29/GRRF/2012/5 proposing to amend the definition of the measuring rim for C1, C2 and C3 tyres. Following the discussion, the expert from France presented a revised proposal (GRRF-72-24) taking into account the comments received. GRRF adopted ECE/TRANS/WP.29/GRRF/2012/5 as reproduced in Annex VII and agreed to submit it to WP.29 and AC.1, for consideration at their November 2012 sessions, as a separate document for draft Supplement 2 to the 02 series of Amendments to Regulation No. 117, also subject to a final review by GRB and GRRF at their next sessions in September 2012.

34. The expert from ETRTO proposed to clarify the title of Regulation No. 117 and its Annex 1 (ECE/TRANS/WP.29/GRRF/2012/10). GRRF adopted the proposal and it was agreed to have a final review by GRB and GRRF at their next sessions in September 2012. The secretariat was requested to submit it to WP.29 and AC.1, for consideration at their November 2012 sessions, as part (paras. 25 and 32 above) of draft Supplement 2 to the 02 series of amendments to Regulation No. 117.

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.