UN R30 — Supplement 25 to the 02 series of amendments

Paragraph 2.9.3. now defines a “Radial” tyre structure. Its ply cords extend to the beads and are laid substantially at 90° to the centre line of the tread in a zone. This zone includes most of the side wall and is outside the bead and the belt. New paragraph 3.1.17. adds “ERS” to the required markings, for radial tyres whose ply cords are not substantially at 90° across the complete cross section. In Annex 3, new item (d) places the symbol “ERS” close to the tyre-size designation, and a new figure replaces the figure in paragraph 1. For radial tyres, paragraph 4.1.4.1. and Annex 1 item 4.3.1. now ask if the ply cords are substantially at 90° across the complete cross section.

Paragraph 2.25.3.2. no longer includes the optional word “RADIAL”, and new paragraph 3.1.15. now gives it as an optional marking on radial-ply tyres. Paragraph 2.25.3.3. no longer includes the words “BIAS-BELTED”, and new paragraph 3.1.16. now gives them as a marking on bias-belted tyres. On run flat or self-supporting tyres, the letters “RF” now replace the letter “F” in front of the rim diameter marking (for example, “235/45 RF 17”). Paragraph 2.25.3.4. now uses the term “speed-category symbol”.

The “Snow tyre” definition in paragraph 2.6. now says “in mud and/or snow conditions” in place of “in snow conditions”. It also says “initiate and control vehicle motion” in place of “initiate or maintain vehicle motion”, and “construction” in place of “structure”. Paragraph 3.1.6. now says that “M+S” or “M.S” or “M&S” means “Mud and Snow”.

To be categorized as a special use tyre, a tyre must still have the block tread pattern of paragraph 6.3.1. The tread depth must now be ≥ 9 mm and the void-to-fill ratio ≥ 30 per cent, in place of 11 mm and 35 per cent. In paragraph 6.3.2., a professional off-road tyre must now be a special use tyre. Its limits of 11 mm and 35 per cent stay the same. Item (c) of paragraph 6.3.2. now reads “a speed category ≤ 160 km/h” in place of “A maximum speed rating of ≤ Q”. New item 4.2.1. of Annex 1 asks, for special use tyres, whether the tyre is a professional off-road tyre.

New paragraph 2.25.8. adds the letters “HL” in front of the nominal section width of Extra Load tyres to the tyre-size designation, as an option. New paragraph 11.5. covers approvals first issued before the entry into force of Supplement 25 whose communication form says “HL” precedes the tyre-size designation. Contracting Parties must not refuse extensions of these approvals adding “HL” under paragraph 2.25.8. if their communication form says “HL” precedes the tyre-size designation. Paragraph 2.25.7. now ends with a semicolon in place of a full stop.

In the flat tyre running mode procedures of Annex 7, the test speed paragraphs 3.8.2. and 4.8.2. now have the numbers 3.6. and 4.6. The measurements of the deflected section heights Z1 and Z2 are now paragraphs 3.8.2., 3.8.4., 4.8.2. and 4.8.4. of the test particulars. Paragraphs 3.8.1. and 4.8.1. now say to accelerate the tyre-and-wheel assembly from zero speed to the constant test speed within 5 minutes. Paragraphs 3.8.3. and 4.8.3. now say to run it at the constant test speed and the constant test load for 60 minutes. Paragraphs 3.2. and 4.2. now give the inflation pressure as 250 kPa in place of 2.5 bar.

New paragraph 2.38. defines “Service description” as the association of the load-capacity index with a speed-category symbol (for example, “94H”). The former paragraphs 2.38. to 2.43. are now paragraphs 2.39. to 2.44. Several paragraphs now use the terms “load-capacity index” and “speed-category symbol”. Pressures in the changed paragraphs and tables are now given in kPa in place of bar, for example 170 kPa in place of 1.7 bar. Paragraph 2.10. now refers to ISO 4000-1:2021 in place of ISO 4000-1:2010.