12. The expert from the Netherlands presented a study (GRB-62-09 and Add.1) on noise emission from the Original Equipment Manufacturer (OEM) tyres of a specific size which were found to be around 1 dB(A) lower than the one from replacement tyres of the same size. The expert, thus, proposed to further reduce the limit values for OEM tyres in the 02 series of amendments to Regulation No. 117 (GRB-62-11 and Add.1).

13. The expert from Switzerland expressed his support for the general direction of the Dutch proposal. The experts from Germany and EC were of the view that, at this stage, it would be premature to tighten the tyre noise limits of Regulation No. 117. The expert from France called for a holistic approach to this issue. The experts from ETRTO and OICA expressed doubts about the representativeness of the tyre sample used in the Dutch study. The expert from ETRTO also delivered comments on the proposal for amendments to Regulation No. 117 (GRB-62-17). Finally, GRB invited all experts to further study the Dutch proposal and decided to revert to this issue at the next session.

14. The expert from ETRTO introduced ECE/TRANS/WP.29/GRRF/2015/27 and ECE/TRANS/WP.29/GRRF/2015/32 which would be considered at the forthcoming session of the Working Party on Brakes and Running Gear (GRRF) (15-18 September 2015). GRB experts were invited to review these documents and to provide their colleagues in GRRF with comments, if any.

Documentation
GRB-62-09 | Statistics of tyre noise label values in Original Equipment Manufacturer (OEM) tyres (Netherlands and M+P)
GRB-62-09/Add.1 | Statistics of tyre noise label values in OEM tyres (presentation) (Netherlands)
GRB-62-11 | Proposal for amendments to the 02 series of amendments to Regulation 117 (Netherlands)
GRB-62-11/Add.1 | Proposal for amendments to the 02 series of amendments to Regulation 117 (presentation) (Netherlands)
GRB-62-17 | Comments on tyre noise performance and proposal for higher stringecy (ETRTO)
GRB/2015/9 | Proposal for a new Regulation concerning the approval of quiet road transport vehicles
GRRF/2015/27 | Proposal for amendment to Regulation No. 54 and Regulation No. 117 (ETRTO)
GRRF/2015/32 | Proposal for amendments to Regulation No. 117 (France)