UN R75: Proposal for Supplement 21
Document GRBP/2025/11
4 December 2024
Proposal to
- Add a generic reference to the Consolidated Resolution on the Construction of Vehicles (R.E.3) in footnote 5.
- align the categories of use to “normal tyre”, “snow tyre” and “specialuse tyre” in line with UN R30 and 54, to introduce a definition of “normal
tyre” and consequently make use of the terms “snow tyre” and “special-use tyre” that are already defined - reformat Annex 5, Table 7 to present the tyre-size designations in a consistent way and to provide explicitly that tyre-size designations from this table may also be used for tyres in bias-beltedvstructure
- Include the suffix “M/C” that is defined as mandatory for motor-cycle tyres with rim diameter code 13 and above in the figure illustrating the sidewall markings in Annex 3 and to present the markings in a clearer way
- Add provisions for the dimensional requirements of moped tyres
- Add a factor for the centrifugal radius of snow tyres and special-use tyres with a speed category above 210 km/h
- Give the footnotes in the main body of the regulation an unequivocal number to avoid confusion when referencing to a particular footnote
- Include several editorial corrections to increase the consistency of the text (e.g. consistent use of the terms defined in section 2, such as “tyre-size designation”, “load-capacity index”, “speed-category symbol”).
Status: Formal GR review