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/2020/21
Origin: France
Date: 23 June 2020
Proposal Status: Formal GR review
Related Documents:
GRBP-72-22 | Radial definition proposal
GRBP-72-24 | UN R30: Proposal for amendments to document GRBP/2020/21
Working Party on Noise and Tyres | Session 72 | 7-9 Sep 2020

11. The expert from France proposed a new definition of “radial tyre” (ECE/TRANS/WP.29/GRBP/2020/21 and GRBP-72-22), which was amended by the expert from EC (GRBP-72-24). The expert from Japan held the view that the proposal was not sufficiently clear. The expert of ETRTO pointed out that his organization would need technical justification to support the proposal. The Chair invited all experts concerned to internally re-discuss the proposal and to submit an updated document to the next session.