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GRBP will address editorial corrections and clarifications to the new 01 series of amendments to UN Regulations Nos. 108 and 109 that were submitted by the expert from ETRTO.
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GRBP/2025/15 | UN R108: Proposal for a Supplement to the 01 series of amendments
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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Document status: Superseded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
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View full document file for more information
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GRBP/2025/16 | UN R109: Proposal for a Supplement to the 01 series of amendments
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UN R109: Proposal for a Supplement to the 01 series of amendments
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Reference Number: GRBP/2025/16
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Proposal to: - Correct the description of a tyre to exclude aspects outside the scope of UN R109
- Clarify the definition of nominal rim diameter
- Clarify the definition of principal grooves in line with the proposal for UN R54
- Amend para. 6.4.4.2. to clarify that the UN R117 certificate may be used for obtaining the type approval under UN R172 of retreaded tyres classified as traction tyre
- Simplify the wording of the requirements for professional off-road tyres
- 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
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View full document file for more information
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GRBP-81-11/Rev.1 | UN R108: Proposal to supersede document GRBP/2025/15
GRBP-81-12/Rev.1 | UN R109: Proposal to supersede document GRBP/2025/16
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