Proposal to amend the tyre dimension requirements. The current rules for calculating the dimensional limits are not consistent among the UN Regulations for tyres and within the Regulations themselves. Hence they lead to uncertainty in the correct calculation. The current proposal aims at unifying the calculation rules to those used in ISO 4000-1 and all major tyre standards, e.g. ETRTO, Tyre & Rim Association (T&RA), Japan Automobile Tyre Manufacturers Association (JATMA).
58. Agenda item 4.9.4., in ECE/TRANS/WP.29/2016/52, amend the title of the document to read: “Proposal for Supplement 21 to Regulation No. 54”, amend the title on page 2, to read: “Supplement 21 to Regulation No. 54 (Tyres for commercial vehicles and their trailers)”
36. The expert from ETRTO also introduced ECE/TRANS/WP.29/GRRF/2015/28 proposing to amend tyre dimensional requirements in Regulation No. 54. GRRF adopted this proposal.
37. GRRF requested the secretariat to submit both adopted proposals above to WP.29 and AC.1 for consideration at their June 2016 sessions, as Supplement 21 to Regulation No. 54.
| WP.29/2016/52 |