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UN R108: Proposal for Supplement 1 to the 01 series of amendments

Document WP.29/2025/73

10 April 2025

196th WP.29 session (23-27 Jun)

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:….

Status: Adopted by WP.29

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Previous Documents, Discussions, and Outcomes

196th WP.29 session (23-27 Jun)

4.8.8. UN R108: Proposal for Supplement 1 to the 01 series of amendments

81st GRBP session (18-21 Feb)

6. (d) UN Regulations on Retreaded Tyres

80th GRBP session (17-20 Sep 2024)

6. (b) UN Regulations on Retreaded Tyres

24. The expert from ETRTO proposed a correction to the 01 series of amendments to UN Regulation No. 108 (Retreaded tyres for passenger cars and their trailers) (ECE/TRANS/WP.29/GRBP/2024/24). GRBP adopted the correction as a Supplement to both the 00 and 01 series of amendments but agreed to postpone its submission to WP.29 and AC.1 in view of another forthcoming amendment proposal to the same UN Regulation which would be submitted by ETRTO to the next session.

Reference Number:	WP.29/1186
Meeting Session(s):	196th WP.29 session (23-27 Jun)
Document date:	11 Jul 25

Reference Number:	ADS-12-03/Rev.1
Meeting Session(s):	12th ADS session (7-11 Jul)
Document date:	11 Jul 25
Regarding:	Automated Driving
View full document file for more information

Reference Number:	RDASEP-07-02/Rev.1
Submitted by:	ICCT
Meeting Session(s):	7th RDASEP session (10 Jul)
Document date:	11 Jul 25
Regarding:	UN R51 Vehicle Noise

Reference Number:	RDASEP-06-03/Rev.1
Meeting Session(s):	6th RDASEP session (8 Apr)
Document date:	11 Jul 25
Regarding:	UN R51 Vehicle Noise

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