GAR | WP.29/2025/71

WP.29/2025/71

UN R54: Proposal for a Supplement 28

Source(s)

Date

10 Apr 2025

Status

Adopted

Subject

UN R54 CV Tires

Impact

Original text | Supplement 28

Meeting(s)

WP.29 | Session 196 | 23-27 Jun 2025

Agenda item 4.8.6. UN R54: Proposal for Supplement 28

Proposal to

Add a generic reference to the Consolidated Resolution on the Construction of Vehicles (R.E.3) in footnote 1
Make editorial corrections to the type of tyre and additional service description definitions
Clarify the definition of nominal rim diameter (in line with the proposal for amending UN R30)
Amend the definition of principal grooves (in line with the proposal for amending UN R30
Introduce a definition for tread depth (used in the requirements for special use and professional off-road tyres)
Introduce definition for free rolling tyre and front axle, and related revision of markings (ref. GRBP-80-03 and GRBP-80-26)
Clarify the D_max requirement for snow tyres
Simplify rhz wording of the requirements for professional off-road tyres
Add an indication for whether a special use tyre is a professional off-road tyre to the communication form (in line with UN R30).

Downloads

UNECE server

Related documents

Excerpts from session reports

GRBP | Session 81 | 18-21 Feb 2025

13. The expert from ETRTO introduced draft amendments to clarify several definitions and to make editorial changes (ECE/TRANS/WP.29/GRBP/2025/10). GRBP adopted these proposals, as amended by GRBP-81-06-Rev.1, and requested the secretariat to submit them for consideration and vote at the June 2025 sessions of WP.29 and AC.1 as draft Supplement 28 to UN Regulation No. 54.

WP.29 | Session 196 | 23-27 Jun 2025

71. The Chair of GRBP presented draft amendments under agenda item 4.8.1. The World Forum recommended their submission to AC.1 for voting.

72. WP.29 considered draft amendments under agenda items 4.8.2 to 4.8.13 and recommended their submission to AC.1 for voting, subject to the following editorial corrections: ECE/TRANS/WP.29/2025/68, ECE/TRANS/WP.29/2025/71, ECE/TRANS/WP.29/2025/72, paragraph 6.1.1.1., amend to read: “6.1.1.1. The section width S of a tyre fitted on the measuring rim shall be calculated by the following formula: , and rounded to the nearest millimetre, Where: S1 is the nominal section width in millimetres, as shown on the sidewall of the tyre in the tyre designation as prescribed; …” ECE/TRANS/WP.29/2025/72, Annex 5, Table 7, first column, rows MU90-15, MV90-15, MU85-16, MV85-15, delete “M/C”. ECE/TRANS/WP.29/2025/73, paragraph 2.22.1., the first sentence, amend to read: “When the nominal rim diameter (“d” symbol) is expressed by code, the values of the “d” symbol are as follows:…”. ECE/TRANS/WP.29/2025/76, paragraph 6.8., first sentence, delete “all of”. ECE/TRANS/WP.29/2025/77, paragraph 5.2.3.2.2., replace “… the Snow Grip Symbol for Studded Tyres1 as described in UN Regulation No.” with “… the Snow Grip Symbol for Studded Tyres1 as described in UN Regulation No. 164)”. Paragraph 5.2.5.2., first line, delete “a”. ECE/TRANS/WP.29/2025/78, paragraph 12.3, replace “… based on snow performance test described in Annex 7 to this Regulation…” with “… based on snow performance test described in Annex 7 to UN Regulation No. 117…”.

With 35 of the 55 Contracting Parties applying UN R54 present and voting, AC.1 adopted document WP.29/2025/71, as amended by para. 72 per the session report, by a vote of 35 in favor, 0 opposed, with 0 abstaining.