Proposal to align the provisions for retreaded tyres with parallel proposals for UN R54 and UN R117 and to cover all the tread materials and to allow upgrading of the service description of a used casing subject to meeting conditions for traceability.
ECE/TRANS/WP.29/GRBP/72, paras. 18 and 19, based on ECE/TRANS/WP.29/GRBP/2021/18, ECE/TRANS/WP.29/GRBP/2021/16 as amended by Annex IV to the report and informal document WP.29-186-07.