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UN R54 Supplement 23 (00 series) · UNECE Regulation No. 54 (ECE R54) — Uniform provisions concerning the approval of pneumatic tyres for commercial vehicles and their trailers.

UN R54 — Supplement 23 to the 00 series of amendments

Supplement 22 → 23

Adopted at the WP.29 175th sessionEntry into force 2018-12-29
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What changed
  • For tyres intended for dual mounting (twinning), paragraph 6.1.4.2. now gives width tolerances in a table: 2% or 4% for the tyres it lists.
  • Annex 5, Part II, Table B now has “Highway Tread” and “Traction Tread” columns and new notes 4, 5 and 6.
  • Annex 5, Part II, Tables C and E now list the sizes 16.00-20 and 24R20.5.
Why
  • The text did not refer correctly to the proper paragraphs after the renumbering needed for the introduction of new paragraphs.
  • The change to paragraph 6.1.4.2. aims to properly take into account the requirements for size designations in Annex 5.
  • The new notes to Table B answer a GRRF request to introduce the appropriate formulae in the Regulation instead of continuously updating Annex 5.

Q1What changed74 changes

Overall width of tyres for dual mounting (para. 6.1.4.2.)

Paragraph 6.1.4.2. now has a table for tyres intended for dual mounting (twinning). For these tyres listed in column A, the overall width may exceed the value of paragraph 6.1.1., taking into account the column B tolerances. Column B gives 2% for radial metric tyres with nominal section width exceeding 305 mm and aspect ratio higher than 60. It gives 4% for diagonal (bias-ply) metric tyres with nominal section width exceeding 305 mm. For radial and diagonal (bias-ply) tyres listed in Annex 5 Part 1 with section width exceeding 305 mm, it gives 2% and 4%. Different specific tolerances are listed in annex 5 Part II in footnotes of the relevant tables.

It may exceed that value by 4 per cent in case of radial-ply tyres and by 8 per cent in the case of diagonal (bias-ply) tyres. However, for tyres with nominal section width exceeding 305 mm intended for dual mounting (twinning), ) listed in column A of the following table, the overall width of the tyre may exceed the value determined pursuant to paragraph 6.1.1. above shall not be exceeded by more than 2 per cent for radial-ply tyres with nominal aspect ratio higher than 60, or 4 per cent for diagonal (bias-ply) tyrestaking into account the tolerances listed in column B; different specific tolerances are listed in annex 5 Part II in footnotes of the relevant tables. The respective limits shall be rounded to the nearest millimetre (mm).
A B radial metric tyres with nominal section width exceeding 305 mm and aspect ratio higher than 60 2% radial tyres listed in Annex 5 Part 1 with section width exceeding 305 mm 2% diagonal (bias-ply) metric tyres with nominal section width exceeding 305 mm 4% diagonal (bias-ply) tyres listed in Annex 5 Part 1 with section width exceeding 305 mm 4%

Annex 5, Part II, Table B: tread columns and notes 2, 4, 5 and 6

In Table B of Annex 5, Part II, the outer diameter columns now read “Highway Tread” and “Traction Tread” in place of “Normal” and “Snow”. New note 5 says that traction tread tyres are those bearing at least one of the following inscriptions. These are the inscription(s) defined in section 3.1.13., and the Alpine symbol (3PMSF) and the “TRACTION” inscription as defined in UN Regulation 117. New note 6 says that highway tread tyres are all tyres that are not Traction tread. Under note 2, the manufacturer must now declare the tread type selected for the application in section 9 of the Annex 1 communication form. New note 4 covers tyre size designations not included in the table: designation numbers, conversion from code to mm, rim width code and outer diameter.

Tyre-size designation1 designation1,4 | Measuring rim width code | Nominal rim diameter d (mm) | Outer diameter D (mm)2 | | Section width S (mm)3 | | | Normal | Snow Highway Tread6 | Traction Tread5 | 9-15LT | 8.00 | 381 | 744 | 755 | 254 10-15LT | 8.00 | 381 | 773 | 783 | 264 11-15LT | 8.00 | 381 | 777 | 788 | 279 24x7.50-13LT | 6.00 | 330 | 597 | 604 | 191 27x8.50-14LT | 7.00 | 356 | 674 | 680 | 218 28x8.50-15LT | 7.00 | 381 | 699 | 705 | 218 29x9.50-15LT | 7.50 | 381 | 724 | 731 | 240 30x9.50-15LT | 7.50 | 381 | 750 | 756 | 240 31x10.50-15LT | 8.50 | 381 | 775 | 781 | 268 31x11.50-15LT | 9.00 | 381 | 775 | 781 | 290 31x12.50R15LT | 10.00 | 381 | 775 | 781 | 318 31x13.50-15LT | 11.00 | 381 | 775 | 781 | 345 31x15.50-15LT | 12.00 | 381 | 775 | 781 | 390 32x11.50-15LT | 9.00 | 381 | 801 | 807 | 290 33x9.50 R15LT | 7.50 | 381 | 826 | 832 | 240 33x10.50R15LT | 8.50 | 381 | 826 | 832 | 268 33x10.50R17LT | 8.50 | 432 | 826 | 832 | 268 33x10.50R18LT | 8.50 | 457 | 826 | 832 | 268 33x11.50R18LT | 9.00 | 457 | 826 | 832 | 290 33x11.50R20LT | 9.00 | 508 | 826 | 832 | 290 33x12.50-15LT | 10.00 | 381 | 826 | 832 | 318 33x12.50R17LT | 10.00 | 432 | 826 | 832 | 318 33x12.50R18LT | 10.00 | 457 | 826 | 832 | 318 33x12.50R20LT | 10.00 | 508 | 826 | 832 | 318 33x12.50R22LT | 10.00 | 559 | 826 | 832 | 318 33x13.50R15LT | 11.00 | 381 | 826 | 832 | 345 33x15.50R15LT | 12.00 | 381 | 826 | 832 | 390 34x10.50R17LT | 8.50 | 432 | 851 | 858 | 268 34x12.50R18LT | 10.00 | 457 | 851 | 858 | 318 35x11.50R17LT | 9.00 | 432 | 877 | 883 | 290 35x11.50R18LT | 9.00 | 457 | 877 | 883 | 290 35x11.50R20LT | 9.00 | 508 | 877 | 883 | 290 35x12.50-15LT | 10.00 | 381 | 877 | 883 | 318 35x12.50R17LT | 10.00 | 432 | 877 | 883 | 318 35x12.50R18LT | 10.00 | 457 | 877 | 883 | 318 35x12.50R20LT | 10.00 | 508 | 877 | 883 | 318 35x12.50R22LT | 10.00 | 559 | 877 | 883 | 318 35x13.50R15LT | 11.00 | 381 | 877 | 883 | 345 35x13.50R18LT | 11.00 | 457 | 877 | 883 | 345 35x13.50R20LT | 11.00 | 508 | 877 | 883 | 345 35x14.50R15LT | 12.00 | 381 | 877 | 883 | 372 36x13.50R18LT | 11.00 | 457 | 902 | 908 | 345 36x14.50R15LT | 12.00 | 381 | 902 | 908 | 372 36x14.50R17LT | 12.00 | 432 | 902 | 908 | 372 36x14.50R18LT | 12.00 | 457 | 902 | 908 | 372 36x15.50R15LT | 12.00 | 381 | 902 | 908 | 390 36x15.50R20LT | 12.50 | 508 | 902 | 908 | 395 37x11.50R20LT | 9.00 | 508 | 928 | 934 | 290 37x12.50-15LT | 10.00 | 381 | 928 | 934 | 318 37x12.50 R17LT | 10.00 | 432 | 928 | 934 | 318 37x12.50R18LT | 10.00 | 457 | 928 | 934 | 318 37x12.50R20LT | 10.00 | 508 | 928 | 934 | 318 37x12.50R22LT | 10.00 | 559 | 928 | 934 | 318 37x13.50R15LT | 11.00 | 381 | 928 | 934 | 345 37x13.50R17LT | 11.00 | 432 | 928 | 934 | 345 37x13.50R18LT | 11.00 | 457 | 928 | 934 | 345 37x13.50R20LT | 11.00 | 508 | 928 | 934 | 345 37x13.50R22LT | 11.00 | 559 | 928 | 934 | 345 37x13.50R24LT | 11.00 | 610 | 928 | 934 | 345 37x13.50R26LT | 11.00 | 660 | 928 | 934 | 345 37x14.50-15LT | 12.00 | 381 | 928 | 934 | 372 38x13.50R17LT | 11.00 | 432 | 953 | 959 | 345 38x13.50R20LT | 11.00 | 508 | 953 | 959 | 345 38x13.50R22LT | 11.00 | 559 | 953 | 959 | 345 38x13.50R24LT | 11.00 | 610 | 953 | 959 | 345 38x14.50R17LT | 12.00 | 432 | 953 | 959 | 372 38x14.50R18LT | 12.00 | 457 | 953 | 959 | 372 38x14.50R20LT | 12.00 | 508 | 953 | 959 | 372 38x15.50R15LT | 12.00 | 381 | 953 | 959 | 390 38x15.50R17LT | 12.00 | 432 | 953 | 959 | 390 38x15.50R18LT | 12.00 | 457 | 953 | 959 | 390 38x15.50R20LT | 12.00 | 508 | 953 | 959 | 390 39x13.50R17LT | 11.00 | 432 | 978 | 985 | 345 40x13.50R17LT | 11.00 | 432 | 1004 | 1010 | 345 40x13.50R20LT | 11.00 | 508 | 1004 | 1010 | 345 40x14.50R17LT | 12.00 | 432 | 1004 | 1010 | 372 40x14.50R18LT | 12.00 | 457 | 1004 | 1010 | 372 40x14.50R20LT | 12.00 | 508 | 1004 | 1010 | 372 40x15.50R20LT | 12.00 | 508 | 1004 | 1010 | 390 40x15.50R22LT | 12.00 | 559 | 1004 | 1010 | 390 40x15.50R24LT | 12.00 | 610 | 1004 | 1010 | 390 40x15.50R26LT | 12.50 | 660 | 1004 | 1010 | 395 42x14.50R17LT | 12.00 | 432 | 1055 | 1061 | 372 42x14.50R20LT | 12.00 | 508 | 1055 | 1061 | 372 8.00-16.5LT | 6.00 | 419 | 720 | 730 | 203 8.75-16.5LT | 6.75 | 419 | 748 | 759 | 222 9.50-16.5LT | 6.75 | 419 | 776 | 787 | 241 10-16.5LT | 8.25 | 419 | 762 | 773 | 264 12-16.5LT | 9.75 | 419 | 818 | 831 | 307 30x9.50-16.5LT | 7.50 | 419 | 750 | 761 | 240 31x10.50-16.5LT | 8.25 | 419 | 775 | 787 | 266 33x12.50-16.5LT | 9.75 | 419 | 826 | 838 | 315 35x12.50 R16.5LT | 10.00 | 419 | 877 | 883 | 318 37x12.50-16.5LT | 9.75 | 419 | 928 | 939 | 315 37x14.50-16.5LT | 11.25 | 419 | 928 | 939 | 365
2 Coefficient 'b' for the calculation of Dmax: 1.07. The manufacturer shall declare in section 9 of the communication form in Annex 1 (‘Any remarks’) the type of tread selected for the application.
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New sizes in Annex 5, Part II, Tables C and E

Table C (code designated tyres mounted on 5° tapered or flat base rims) now lists the size 16.00-20. Table E (code designated tyres mounted on 15° tapered rims) now lists the size 24R20.5.

- - - - - - - - - - - - 16.00-20 11.25 508 1309 1320 - 438
- - - - - - - - 24R20.5 18.00 521 1369 - - 606

References to other paragraphs (paras. 3.4., 4.1.1. and other paragraphs)

Many references give other paragraph numbers: the tyre-size designation is now “as defined in paragraph 2.20.” in place of 2.17. The load-capacity indices are now “as defined in paragraph 2.30.” in place of 2.27. The “tyre to rim fitment configuration” is now “(see paragraph 3.1.12.)” in place of 3.1.11. Paragraph 3.4. now excepts the markings of paragraphs 3.1.1., 3.1.2. and 3.1.13. from location on at least one lower sidewall; before, it named 3.1.1. Paragraph 4.1.1. now reads “The tyre-size designation;” without “as defined in paragraph 2.19. of this Regulation”. In the endurance-test programme of Annex 7, note (1) on “Special-use” tyres now refers to item (c) of paragraph 2.1. in place of paragraph 2.1.3.

R is an indication of the structure of the tyre - see paragraph 3.1.33.1.4. of this Regulation
The tyre-size designation as defined in paragraph 2.172.20. of this Regulation shall be grouped as shown in the example above: 255/70 R 22.5 or 235-700 R 450A;
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Word “existing” in paras. 6.1.1.2. and 6.1.2.2.

Paragraphs 6.1.1.2. and 6.1.2.2. no longer have the word “existing” before “types of tyres”.

However, for the existing types of tyres whose designation is given in the first column of the tables in Annex 5 to this Regulation, the section width shall be deemed to be that given opposite the tyre designation in those tables.
However, for the existing types of tyres whose designation is given in the first column of the tables in Annex 5 to this Regulation, the outer diameter shall be deemed to be that given opposite the tyre designation in those tables.

Inflation pressure in Annex 3 and load-capacity indices in Annex 4

In Annex 3, the list of what the markings define now says “Requiring to be inflated to 800 kPa for load/speed endurance tests”, in place of 620 kPa. The PSI symbol is 90, as before. The table in Annex 4 now lists the load-capacity indices from 0 to 279 with a mass in kg for each index. Its column headings now read “LI” and “kg”.

Requiring to be inflated to 620 800 kPa for load/speed endurance tests, for which the PSI symbol is 90.
Load-capacity index Corresponding maximum mass to be carried (LI kg) 0 45 1 46.2 2 47.5 3 48.7 4 50 5 51.5 6 53 7 54.5 8 56 9 58 10 60 11 61.5 12 63 13 65 14 67 15 69 16 71 17 73 18 75 19 77.5 20 80 21 82.5 22 85 23 87.5 24 90 25 92.5 26 95 27 97.5 28 100 29 103 30 106 31 109 32 112 33 115 34 118 35 121 36 125 37 128 38 132 39 136 40 140 41 145 42 150 43 155 44 160 45 165 46 170 47 175 48 180 49 185 50 190 51 195 52 200 53 206 54 212 55 218 56 224 57 230 58 236 59 243 60 250 61 257 62 265 63 272 64 280 65 290 66 300 67 307 68 315 69 325 70 335 71 345 72 355 73 365 74 375 75 387 76 400 77 412 78 425 79 437 80 450 81 462 82 475 83 487 84 500 85 515 86 530 87 545 88 560 89 580 90 600 91 615 92 630 93 650 94 670 95 690 96 710 97 730 98 750 99 775 100 800 101 825 102 850 103 875 104 900 105 925 106 950 107 975 108 1 000 109 1 030 110 1 060 111 1 090 112 1 120 113 1 150 114 1 180 115 1 215 116 1 250 117 1 285 118 1 320 119 1 360 120 1 400 121 1 450 122 1 500 123 1 550 124 1 600 125 1 650 126 1 700 127 1 750 128 1 800 129 1 850 130 1 900 131 1 950 132 2 000 133 2 060 134 2 120 135 2 180 136 2 240 137 2 300 138 2 360 139 2 430 140 2 500 141 2 575 142 2 650 143 2 725 144 2 800 145 2 900 146 3 000 147 3 075 148 3 150 149 3 250 150 3 350 151 3 450 152 3 550 153 3 650 154 3 750 155 3 875 156 4 000 157 4 125 158 4 250 159 4 375 160 4 500 161 4 625 162 4 750 163 4 875 164 5 000 165 5 150 166 5 300 167 5 450 168 5 600 169 5 800 170 6 000 171 6 150 172 6 300 173 6 500 174 6 700 175 6 900 176 7 100 177 7 300 178 7 500 179 7 750 180 8 000 181 8 250 182 8 500 183 8 750 184 9 000 185 9 250 186 9 500 187 9 750 188 10 000 189 10 300 190 10 600 191 10 900 192 11 200 193 11 500 194 11 800 195 12 150 196 12 500 197 12 850 198 13 200 199 13 600 200 14 000 201 14 500 202 15 000 203 15 500 204 16 000 205 16 500 206 17 000 207 17 500 208 18 000 209 18 500 210 19 000 211 19 500 212 20 000 213 20 600 214 21 200 215 21 800 216 22 400 217 23 000 218 23 600 219 24 300 220 25 000 221 25 750 222 26 500 223 27 250 224 28 000 225 29 000 226 30 000 227 30 750 228 31 500 229 32 500 230 33 500 231 34 500 232 35 500 233 36 500 234 37 500 235 38 750 236 40 000 237 41 250 238 42 500 239 43 750 240 45 000 241 46 250 242 47 500 243 48 750 244 50 000 245 51 500 246 53 000 247 54 500 248 56 000 249 58 000 250 60 000 251 61 500 252 63 000 253 65 000 254 67 000 255 69 000 256 71 000 257 73 000 258 75 000 259 77 500 260 80 000 261 82 500 262 85 000 263 87 500 264 90 000 265 92 500 266 95 000 267 97 500 268 100 000 269 103 000 270 106 000 271 109 000 272 112 000 273 115 000 274 118 000 275 121 500 276 125 000 277 128 500 278 132 000 279 136 000

Wording, punctuation and references to other documents

Many references now read “UN Regulation No.” in place of “Regulation No.”, for example “UN Regulation No. 109” in paragraph 5.7. The conformity of production procedures now refer to the Agreement, Schedule 1 (E/ECE/TRANS/505/Rev.3), in place of Appendix 2 (E/ECE/324-E/ECE/TRANS/505/Rev. 2). In two footnotes, “ECE/TRANS/WP.29/78/Rev.2” now reads “ECE/TRANS/WP.29/78/Rev.6”. Paragraph 6.1.5.3.3. now starts “For tyres of the category of use ‘snow tyre’” in place of “For snow tyres of the category of use ‘snow tyre’”. Other changes are in wording, capital letters, punctuation and number format, for example “0.97” in place of “.97” in paragraph 6.1.5.3.1. Some table cells in Annexes 5 and 8 that were blank now show “-”.

Tyre type designation:
concerningConcerning: Approval granted
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Q2Why it changed

Proposed by
Experts from the European Tyre and Rim Technical Organisation (ETRTO)
Working party
GRRF, 86th session (February 2018)

Reasons

  • The text did not refer correctly to the proper paragraphs after the renumbering needed for the introduction of new paragraphs. When paragraph 3.1. was separated into paragraphs 3.1.1. and 3.1.2., not all paragraphs referring to them were properly amended. The reference in paragraph 3.4. is included for consistency with Regulation No. 30. The reference in paragraph 4.1.1. is deleted to be consistent with Regulation No. 30 and to limit the renumbering problems in case of further amendments.

    Sources (5)
    “The current text does not refer correctly to the proper paragraphs after the renumbering has been needed due to the introduction of new paragraphs.”
    “By separating para. 3.1. into paras. 3.1.1. and 3.1.2., not all paragraphs referring to 3.1.1. and 3.1.2. were properly amended.”
    “The reference to para. 3.1.12. in para. 3.4. is included for consistency with Regulation No. 30.”
    “The deletion of the reference in para. 4.1.1. is proposed in order to be consistent with Regulation No. 30”
    “This would also limit the renumbering problems in case of further amendments”

  • The word “existing” is deleted in paragraphs 6.1.1.2. and 6.1.2.2. for consistency with all the other tyre UN Regulations.

    Source
    “The deletion of the word "existing" into paras. 6.1.1.2. and 6.1.2.2. is proposed for consistency with all the other tyre UN Regulations.”

  • The change to paragraph 6.1.4.2. aims to properly take into account the requirements for size designations in Annex 5, in addition to the existing text. As a guideline, the Maximum Overall Width has been taken from ETRTO and the Tyre and Rim Association (TRA).

    Sources (2)
    “The amendment of paragraph 6.1.4.2. is aimed to properly take into account the requirements for size designations in Annex 5 in addition to what already expressed.”
    “As a guideline the Maximum Overall Width has been taken from ETRTO and Tyre and Rim Association (TRA).”

  • The new notes to Annex 5, Part II, Table B answer a request of the Working Party on Brakes and Running Gear (GRRF) to ETRTO. GRRF asked ETRTO to introduce the appropriate formulae in the Regulation instead of continuously updating Annex 5. The sizes added to Tables C and E are needed because they are old sizes that do not follow the guidelines/formulae for high flotation tyres.

    Sources (3)
    “The addition of the footnotes to Annex 5, Part II, Table B is the answer to the request by the Working Party on Brakes and Running Gear (GRRF) to ETRTO”
    “to introduce the appropriate formulae in the Regulation instead of continuously updating Annex 5.”
    “The addition of the sizes in Annex 5, Part II, Tables C and E are needed because they are old sizes that do not follow the guidelines/formulae applicable for high flotation tyres.”

  • Proposer's reason (informal document GRRF-86-26)

    The amendment of a footnote in Annex 5 is proposed to avoid misunderstandings with the definition of “category of use”.

    Submitted by Experts from ETRTO. Working party adoption: ECE/TRANS/WP.29/GRRF/86, para. 30.

    Source
    “It is proposed to amend a footnote in Annex 5 to avoid misunderstandings with the definition of “category of use”.”
    GRRF-86-26II. Justification

Document trail

  1. 2017-12ProposalECE/TRANS/WP.29/GRRF/2018/5Proposal by ETRTO
  2. 2017-12ProposalECE/TRANS/WP.29/GRRF/2018/11ETRTO consolidated text of UN Regulation No. 54, including ECE/TRANS/WP.29/GRRF/2018/5
  3. —Amended in sessionGRRF-86-23ETRTO amendments to ECE/TRANS/WP.29/GRRF/2018/5 and ECE/TRANS/WP.29/GRRF/2018/11 for the 86th GRRF session
  4. —Amended in sessionGRRF-86-26ETRTO amendments to ECE/TRANS/WP.29/GRRF/2018/5 and ECE/TRANS/WP.29/GRRF/2018/11 for the 86th GRRF session
  5. —Working party adoptsECE/TRANS/WP.29/GRRF/86Session report, para. 30
  6. 2018-04Sent to WP.29ECE/TRANS/WP.29/2018/55Text that GRRF sent to WP.29 and AC.1
  7. 2018-06WP.29 adoptsECE/TRANS/WP.29/1139Adopted at the 175th session (session report, para. 118)
  8. 2018-12-29In forceC.N.617.2018.TREATIES-XI.B.16.54UN depositary notification

Q3Who is affected

Vehicle manufacturer

  • No direct action for this role.

Component supplier

  • For Annex 5 Part II Table B sizes, give the selected tread type in section 9 of the communication form.

Technical service / Approval authority

  • For twinning tyres in column A of paragraph 6.1.4.2., apply column B tolerances unless Annex 5 Part II footnotes differ.
  • For tyre-size designations not included in Annex 5, Part II, Table B, use the note 4 rules and formulas.
  • Check 16.00-20 and 24R20.5 tyres against the dimensions now listed in Annex 5, Part II, Tables C and E.

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