Distr.

GENERAL

TRANS/WP.29/GRB/1999/6

6 July 1999

Original: ENGLISH

ECONOMIC COMMISSION FOR EUROPE

INLAND TRANSPORT COMMITTEE

Working Party on the Construction of Vehicles

Working Party on Noise (GRB)

(Thirty-first session, 16 and 17 September 1999,

agenda item 1.)

COMMENTS TO THE PROPOSAL FOR ADDITIONAL AMENDMENTS TO THE DRAFT REGULATION CONCERNING THE APPROVAL OF TYRES WITH REGARD TO ROLLING SOUND EMISSIONS

(Document TRANS/WP.29/GRB/1999/2)

Transmitted by the Expert from Japan

Note: The text reproduced below was prepared by the expert from Japan. It contains some comments concerning the proposal relating to wide section (single) tyres, presented by the expert from France (TRANS/WP.29/GRB/1999/2). It is based on the text of a document distributed without a symbol (informal document No. 3) during the thirtieth session (TRANS/WP.29/GRB/28, para. 11).

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Note:	This document is distributed to the Experts on Noise only.

GE.99-

A.	INTRODUCTION

The French proposal, contained in document TRANS/WP.29/GRB/1999/2, referring to wide section tyres, seems to be acceptable; however the following amendments are proposed.

B.	PROPOSAL

(ii)	Paragraph 2.5.1.,(document TRANS/WP.29/GRB/1999/2), the required load capacity index "LI > 121" should be deleted

(ii)	In order to take account of the noise level produced by tyres fitted on the front axle, the result of noise measurement should be reduced by [3] dBA. */

However, if the noise level produced by wide section (single) tyres and by the front axle tyres is lower than the noise limit, the deduction can be omitted.

C.	JUSTIFICATION

(i)	Wide section (single) tyres exist in Japan.

(ii)	To take account of the noise produced by tyres fitted on the
front axle.

*/ A proposal concerning the noise deduction value will be submitted at a later stage by Japan on the basis of research results.