WP.29/2025/71
UN R54: Proposal for Supplement 28
Source(s)
Date
10 Apr 2025
Status
Adopted
Subject
Impact
Original text | Supplement 28
Meeting(s)

Proposal to

  1. 1. Add a generic reference to the Consolidated Resolution on the Construction of Vehicles (R.E.3) in footnote 1
  2. Make editorial corrections to the type of tyre and additional service description definitions
  3. Clarify the definition of nominal rim diameter (in line with the proposal for amending UN R30)
  4. Amend the definition of principal grooves (in line with the proposal for amending UN R30
  5. Introduce a definition for tread depth (used in the requirements for special use and professional off-road tyres)
  6. Introduce definition for free rolling tyre and front axle, and related revision of markings (ref. GRBP-80-03 and GRBP-80-26)
  7. Clarify the Dmax requirement for snow tyres
  8. Simplify rhz wording of the requirements for professional off-road tyres
  9. 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
GRBP/2025/10
UN R54: Proposal for Supplement 28 (Superseded)
GRBP-81-06/Rev.1
UN R54: Proposal to supersede document GRBP/2025/10 (Superseded)
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.

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