UN R108: Proposal for Supplement 1 to the 01 series of amendments
Reference Number: WP.29/2025/73
Proposal to:
Correct the description of a tyre to exclude aspects outside the scope of UN R108
Align the snow tyre definition to UN R109 and 172
Clarify the definition of nominal rim diameter
Clarify the definition of principal grooves by eliminating the circular reference between this definition and the position of tread wear indicators
Introduce a definition for tread depth (used in the requirements for special use and professional off-road tyres)
Amend para. 4.1.5.3.2. to remove the retreaded reference to traction tyre classification because it is not applicable to tyre of class C1
Clarify the calculation of the tyre section width
Replace “XXX” with the UN Regulation No. 172 in the references to the approval of retreaded tyres with regard to their snow performance and/or classification as traction tyre.</li<
Correct an omission
Clarify the text of Annex 3: The positioning and order of the markings shall be as follows:….
This proposal (WP.29/2025/73), as amended by para. 72, was adopted by the World Forum. Thirty-three Contracting Parties out of the 54 applying UN R108 were present for the vote by AC.1. Thirty-three voted in favor with zero against and zero abstaining.