Comments on tyre noise performance and proposal for higher stringecy
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ETRTO comments raising concerns over the validity of the Dutch dataset used to support the proposal for higher tyre-noise stringency.

Reference Number: GRB-62-17
Origin: ETRTO
Date: 24 August 2015
Related Documents:
GRB-60-08 | Tyre noise limits of EC/661/2009 and ECE R117: Evaluation based on sold tyres in the Netherlands
GRB-60-08/Add.1 | Shifts in tyre sound levels between 2007 and 2013 (Addendum)
GRB-60-12 | Shifts in tyre sound levels between 2007 and 2013
GRB-60-14/Rev.1 | Triple-A tyres – benefits for environment, noise, safety and economy
GRB-61-03 | Possible future tyre noise limits
GRB-61-03/Add.1 | Possible future tyre noise limits (presentation)
GRB-61-18 | ETRTO comments on GRB-60-08, GRB-60-12, GRB-60-14-Rev.1 and GRB-61-03
Discussion(s):
Working Party on Noise | Session 62 | 1-3 Sep 2015

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.