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UN R108: Proposal for a Supplement to the 01 series of amendments
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Reference Number: GRBP/2025/15
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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.
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Submitted by:
ETRTO
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Meeting Sessions: 81st GRBP session (18-21
Feb 2025)
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Document date: 05 Dec 24
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Document status: Superseded
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Relevant to: UN Regulation No. 108 | Retreaded Tires for Motor Vehicles
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