GRBP is invited to consider draft amendments submitted by the expert from ETRTO with the aim to clarify several definitions and to make editorial changes.
Documentation
GRBP/2025/10
UN R54: Proposal for Supplement 28 (ETRTO)
UN R54: Proposal for Supplement 28
Proposal to
1. Add a generic reference to the Consolidated Resolution on the Construction of Vehicles (R.E.3) in footnote 1
Make editorial corrections to the type of tyre and additional service description definitions
Clarify the definition of nominal rim diameter (in line with the proposal for amending UN R30)
Amend the definition of principal grooves (in line with the proposal for amending UN R30
Introduce a definition for tread depth (used in the requirements for special use and professional off-road tyres)
Introduce definition for free rolling tyre and front axle, and related revision of markings (ref. GRBP-80-03 and GRBP-80-26)
Clarify the Dmax requirement for snow tyres
Simplify rhz wording of the requirements for professional off-road tyres
Add an indication for whether a special use tyre is a professional off-road tyre to the communication form (in line with UN R30).