GAR | WP.29/2025/71

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Document Title	UN R54: Proposal for Supplement 28
Reference Number	WP.29/2025/71
Date	10 Apr 2025
Summary	Proposal to 1. 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).
Rulemaking Area(s)	UN R54 CV Tires
Regulatory Impact	Original text \| Supplement 28
Proposal Status	Adopted
Meeting(s)	WP.29 \| Session 196 \| 23-27 Jun 4.8.6. UN R54: Proposal for Supplement 28
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	GRBP/2025/10	UN R54: Proposal for Supplement 28 (superseded)
	GRBP-81-06/Rev.1	UN R54: Proposal to supersede document GRBP/2025/10 (superseded)
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