33. The expert from EC introduced ECE/TRANS/WP.29/GRRF/2011/12 improving the current wet grip test method. The expert from ETRTO proposed GRRF-69-23 improving the wording of the EC proposal. Furthermore, the expert from ETRTO presented in GRRF-71-10 scientific data supporting ECE/TRAN/WP.29/GRRF/2011/12. The expert from Germany questioned the use of references to private standards, such as standards of the American Society for Testing and Materials (ASTM), which are not publicly available. The GRRF Chair offered to seek guidance from WP.29 on this horizontal issue. GRRF adopted ECE/TRANS/WP.29/GRRF/2011/12 as amended in Annex IV and agreed to send it to WP.29 and AC.1 for consideration at their March 2012 sessions, as part of draft Supplement 1 to the 02 series of amendments of Regulation No. 117, subject to a final review by GRRF at its February 2012 session (see also para. 35).

34. GRRF followed with interest the presentation (GRRF-71-06) made by the expert on behalf of ISO on a new test method for wet grip for buses and truck developed by ISO. Further information can be provided by Messrs. G. Dimitri (georges.dimitri@fr.michelin.com) or A. Dryden (dryden@iso.org).

35. The expert from ETRTO presented ECE/TRANS/WP.29/GRRF/2011/30, GRRF-71-04 and GRRF-71-12 introducing a new method for defining C3 snow tyres. GRRF adopted ECE/TRANS/WP.29/GRRF/2011/30 as amended by Annex IV, and agreed to send it to WP.29 and AC.1, for consideration at their March 2012 sessions, as part of draft Supplement 1 to the 02 series of amendments of Regulation No. 117 (see also para. 33), subject to a final review by GRRF at its February 2012 session, as well as the review of the proposal by the Working Party on Noise (GRB).

36. Due to lack of time, GRRF agreed to consider, at its next session, ECE/TRANS/WP.29/GRRF/2011/29 and GRRF-71-11 on an alternative to define C2 snow tyres. Following the adoption of ECE/TRANS/WP.29/GRRF/2011/30, GRRF agreed to remove from the agenda GRRF-71-09 combining ECE/TRANS/WP.29/GRRF/2011/29 and ECE/TRANS/WP.29/GRRF/2011/30.

37. GRRF agreed to consider GRRF-71-29 with an official symbol at its next session.

38. The secretariat was requested to inform GRB about the outcome of the GRRF discussion on Regulation No. 117.

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.