UN R30: Proposal for a Supplement to the 02 series of amendments
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Proposal to expand and improve the current definition of a radial structure while ensuring the radial tyres key features (mechanical decoupling between the tread and the bead).

Reference Number: GRBP/2021/9
Origin: EC and France
Date: 29 June 2021
Proposal Status: Formal GR review
Related Documents:
GRBP-72-24 | UN R30: Proposal for amendments to document GRBP/2020/21
GRBP-74-07 | UN R30: Comments on the proposal for a supplement to the 02 series of amendments (ECE/TRANS/WP.29/GRBP/2021/9)
GRBP/2020/21 | UN R30: Proposal for a Supplement to the 02 series of amendments
GRBP/2021/10 | Proposal for amendments to UN Regulations No. 54, 75, 106, 108, 109
Discussion(s):
Working Party on Noise and Tyres | Session 74 | 15-17 Sep 2021

15. The experts from France and EC introduced an updated proposal for the new definition of “radial tyre” (ECE/TRANS/WP.29/GRBP/2021/9). The same definition was also proposed for UN Regulations Nos. 54, 75, 106, 108 and 109 ECE/TRANS/WP.29/GRBP/2021/10. The experts from Canada and the United States of America raised a number of questions on the proposal (GRBP-74-07) and pointed out that they had started consultations with the authors. GRBP invited the stakeholders, in liaison with ETRTO, to continue discussions and agreed to come back to the proposal at the next session.

16. The expert from ETRTO reported on their ongoing assessment (GRBP-75-22) of the new definition of “radial tyre” that had been proposed by the experts from France and EC at the previous session (ECE/TRANS/WP.29/GRBP/2021/9). GRBP looked forward to the outcome of the ETRTO activities and expected that a final proposal would be submitted to the next session. The experts from the Netherlands and Russian Federation pointed out that the radial tyre definition may not necessarily cover new types of tyre structures and that adding a new subgroup of tyres with their own definition should be considered as an alternative.

Working Party on Noise and Tyres | Session 75 | 8-11 Feb

15. The experts from France and EC introduced an updated proposal for the new definition of “radial tyre” (ECE/TRANS/WP.29/GRBP/2021/9). The same definition was also proposed for UN Regulations Nos. 54, 75, 106, 108 and 109 ECE/TRANS/WP.29/GRBP/2021/10. The experts from Canada and the United States of America raised a number of questions on the proposal (GRBP-74-07) and pointed out that they had started consultations with the authors. GRBP invited the stakeholders, in liaison with ETRTO, to continue discussions and agreed to come back to the proposal at the next session.

16. The expert from ETRTO reported on their ongoing assessment (GRBP-75-22) of the new definition of “radial tyre” that had been proposed by the experts from France and EC at the previous session (ECE/TRANS/WP.29/GRBP/2021/9). GRBP looked forward to the outcome of the ETRTO activities and expected that a final proposal would be submitted to the next session. The experts from the Netherlands and Russian Federation pointed out that the radial tyre definition may not necessarily cover new types of tyre structures and that adding a new subgroup of tyres with their own definition should be considered as an alternative.