GAR | WP.29/2025/68

Document Title	UN R30: Proposal for Supplement 27 to the 02 series of amendments
Reference Number	WP.29/2025/68
Date	9 Apr 2025
Summary	Proposal to: Update reference to ISO 4000-1:2024 (published in March 2024) Clarify the structure indication within the tyre size designation for run flat or self-supporting tyres suitable for speeds in excess of 240 km/h (inscription "ZRF") Clarify the nominal rim diameter. Amend the definition of principal grooves by eliminating the circular reference between this definition and the position of tread wear indicators. Introduce definition of tread depth (used in the requirements for special use and professional off-road tyres) Clarify the calculation of tyre section width Claify the D_max requirement for snow tyres.
Rulemaking Area(s)	UN R30 Pneumatic Tires
Regulatory Impact	02 series of amendments \| Supplement 27
Proposal Status	Adopted
Meeting(s)	WP.29 \| Session 196 \| 23-27 Jun 4.8.3. UN R30: Proposal for Supplement 27 to the 02 series of amendments
Related Documents
	GRBP/2025/9	UN R30: Proposal for Supplement 27 to the 02 series of amendments \| Superseded	change status?
	GRBP-81-05/Rev.1	UN R30: Proposal to supersede document GRBP/2025/9 \| Superseded	change status?
	GRBP/79	Report of the 81st (February 2025) GRBP working party session
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