1 2 3 4 5 6 7 8 9 10
Document Title UN R75: Proposal for Supplement 21
Reference Number GRBP/2025/11
Date
4 Dec 2024
Summary Proposal to
  1. Add a generic reference to the Consolidated Resolution on the Construction of Vehicles (R.E.3) in footnote 5.
  2. 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
  3. 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
  4. 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
  5. Add provisions for the dimensional requirements of moped tyres
  6. Add a factor for the centrifugal radius of snow tyres and special-use tyres with a speed category above 210 km/h
  7. Give the footnotes in the main body of the regulation an unequivocal number to avoid confusion when referencing to a particular footnote
  8. 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").
Source(s) ETRTO
Rulemaking Area(s) UN R75 Motorcycle Tires
Proposal Status Superseded
Meeting(s)
Related Documents
GRBP-81-07/Rev.1 UN R75: Proposal to supersede document GRBP/2025/11 (superseded)
GRBP-81-13/Rev.1 Supporting material for ETRTO working documents
WP.29/2025/72 UN R75: Proposal for Supplement 21 (adopted)
Downloads
UNECE server .pdf format .docx format
GAR server .pdf format .docx format