GRBP/2025/15
UN R108: Proposal for a Supplement to the 01 series of amendments
UN R108: Proposal for a Supplement to the 01 series of amendments
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.
GRBP/2025/16
UN R109: Proposal for a Supplement to the 01 series of amendments
UN R109: Proposal for a Supplement to the 01 series of amendments
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.
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.