Proposal to modify the marking requirements to replace PSI with kilopascals (“kPa”). The intent is to harmonize the pressure indication and avoid confusion between UN Regulation No. 54 and US FMVSS 119 or FMVSS 139. The proposal would also change the measurement units for drum speed from min^-1 to km.h^-1 in alignment with the requirements with other tyre regulations and align the wording in Annex 7, Appendix 1 with the text of the Regulation.

Proposal to:
a) Align definitions and content with the other tyre regulations (UN Regulations Nos. 30, 117, 75 etc.);
b) Include a definition of “manufacturer” extracted from the resolution “R.E.3”;
c) Adopt a common definition and use of the terms “Manufacturer’s name”, “Brand name”, “Trademark”, “Trade description” and “Commercial name” and their links; and
d) Add information in the certificate to enable approval authorities to more easily understand the products the certificate addresses.

Proposal to add new tyre sizes to Annex 5 of UN R54.

The current text of UN R54 does not encompass the case where a tyre designed for a “special” application can also fulfil the definition of a “snow” tyre. This proposal would allow for such tyres to be marked with the inscription M+S, M.S, or M&S while remaining in the category of use “special”.

Proposal to clarify the provisions for the minimum heights of markings for tyres with nominal rim diameter codes ≥ 20 and nominal section width ≤ 235 and for tyres with nominal rim diameter codes < 20 and nominal section width > 235. In addition, the proposal aligns the table on minimum marking heights to correspond with the related figure by using lowercase letters to denote dimensions in both (currently, the figure uses lowercase, but the table uses uppercase).

The current text of UN R54 does not encompass the case where a tyre designed for a “special” application can also fulfil the definition of a “snow” tyre. This proposal would allow for such tyres to be marked with the inscription M+S, M.S, or M&S while remaining in the category of use “special”.