ETRTO report on the study on the Dimensional Requirements for tyres with radial or run flat structure after having performed the load speed endurance test. ETRTO proposes to amend the UN Regulations No 30, 54 [and 75] by removing the requirements for tyres with radial and run flat structure.

Proposal to

1. Change the definition of the tyre size designation by including prefixes and suffixes as well as the code for the tyre structure
2. Clarify the use of sizes listed in Annex 5
3. Move the definition of “reinforced” into a paragraph that is not subordinated to the definition of “Structure of a tyre”
4. Correct references and typographical errors
5. Rearrange paragraphs and amendments in order to increase readability
6. Delete an unnecessary cross-reference to UN Regulation No. 54
7. Change the definition of “bias-belted”
8. Amend the definition of “snow tyres” by replacing “ordinary (road-type) tyres” (which is not defined) by “normal tyre”, removing the note that snow tyres generally have more widely spaced ribs or blocks
9. Include a general provision addressing the gap between the effective date of entry into force and the date of notification of the adoption of the Supplement to the Contracting Parties
10. Keep the restriction of measurement of overall diameter after load/speed test only to diagonal tyres (For radial the variation of outer diameter of the tyre, measured six hours after the load/speed performance test as specified in paragraph 2 of Annex 7, is far below ±3.5 per cent from the outer diameter as measured before the test.)
11. Remove use of the word “moulding”
12. Resolve conflicting provisions in Annex 2 concerning the minimum size of the approval mark
13. Clarify that mounting motorcycle tyres on motorcycle rims is the standard configuration and that “M/C” marking is optional for the sizes listed in Annex 5.