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UN R117 Supplement 4 (04 series) · UNECE Regulation No. 117 (ECE R117) — Uniform provisions concerning the approval of tyres with regard to rolling sound emissions and/or to adhesion on wet surfaces and/or to rolling resistance.

UN R117 — Supplement 4 to the 04 series of amendments

Supplement 3 → 4

Adopted at the WP.29 199th sessionEntry into force not yet known
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What changed
  • Paragraphs 1.3., 2.21., 3.1.1.1. and 5.7. to 5.10. on tyre abrasion are deleted. Annex 10, the procedure for determining the abrasion performance of tyres of class C1, is also deleted with all its appendices.
  • Annex 5, part (b), paragraph 1.1.1. now gives μpeak and BFC ranges for the wetted track by tyre class, SRTT and method.
  • Paragraph 2.18. now refers to F2872 – 25, F2871 – 25 and F3678 – 25 for the SRTT16C, SRTT19.5 and SRTT19.5 siped.
Why
  • It is proposed to move all provisions related to tyre abrasion into a separate UN Regulation.
  • The year references to the latest international standard specifications ASTM F2872-25, F2871-25 and F3678-25 are updated.
  • The expert from ETRTO proposed a correction to the 04 series of amendments (GRBP-82-27). This proposal covers paragraphs 1.1.1. and 1.1.1.1. of Annex 5, part (b).

Q1What changed769 changes

Abrasion provisions deleted (paras. 1.3., 2.21., 3.1.1.1., 5.7. to 5.10.; Annex 1, items 8.6. and 8.6.1.)

Paragraph 1.1. no longer says that the Regulation also applies to C1 tyres in new state with regard to their abrasion. Deleted paragraph 1.3. applied to class C1 tyres, except ice grip tyres and tyres having a nominal rim diameter code ≤ 13. For these tyres, approval had to be supplemented with information on the abrasion level according to paragraphs 5.7 to 5.9. The abrasion definitions in paragraph 2.21., paragraphs 3.1.1.1. and 5.7. to 5.10. and Annex 1 items 8.6. and 8.6.1. are also deleted. From 1 January 2027, paragraph 5.9. required the manufacturer to communicate the tyre abrasion level during the approval of new type of class C1 tyres. In paragraph 3.2.1., the list of performances for the details of the major features no longer includes tyre abrasion.

This Regulation applies to new pneumatic tyres of classes C1, C2 and C3 in new state with regard to their sound emissions, and rolling resistance, and in new and in worn state with regard to adhesion performance on wet surfaces (wet adhesion). It also applies to C1 tyres in new state with regards to their abrasion as defined in paragraph 1.3. of this UN Regulation. It does not, however, apply to:
In the case of class C1 tyres, except ice grip tyres and tyres having a nominal rim diameter code ≤ 13, approval shall be supplemented with information on the abrasion level according to paragraphs 5.7 to 5.9 of this Regulation.
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Annex 10 on the abrasion performance of class C1 tyres deleted

Annex 10, “Procedure for determining the abrasion performance of tyres of class C1”, is deleted with all its appendices. Deleted text includes test method (a) using vehicle on public open roads and test method (b) using indoor drum.

Procedure for determining the abrasion performance of tyres of class C1
Accelerations calculation
734 more changes in this group — open in Compare

ASTM standards for the SRTT16C, SRTT19.5 and SRTT19.5 siped (para. 2.18.)

Paragraph 2.18. now refers to F2872 – 25 for the SRTT16C, F2871 – 25 for the SRTT19.5 and F3678 – 25 for the SRTT19.5 siped. Before, these were F2872 – 19, F2871 – 23 and F3678 – 23. An SRTT is a tyre that is produced, controlled and stored in accordance with the standards of ASTM International.

F2872 – 19 25 for the size 225/75R16C and referred to as "SRTT16C";",
F2871 – 23 25 for the size 245/70R19.5 and referred to as "SRTT19.5";",
2 more changes in this group — open in Compare

Wetted track friction ranges by tyre class and SRTT (Annex 5, part (b), paras. 1.1.1. and 1.1.1.1.)

Under paragraph 1.1.1., the class of the candidate tyre and the method (trailer or vehicle) decide how the wetted track surface friction value is established. Its table gives μpeak ranges (trailer method) and BFC ranges (vehicle method) by tyre class and SRTT. For example, for C2 tyres and the SRTT16C, the ranges are 0.44 – 0.77 (trailer method) and 0.36 – 0.69 (vehicle method). Before, the text of paragraph 1.1.1. was “Standard Reference Test Tyre method”, and text on a method that uses the SRTT16 is deleted. In paragraph 1.1.1.1., “exceeds 4 per cent” becomes “is greater than 4 per cent” for the coefficient of variation CVµ. The µpeak,corr limits now read “greater than or equal to 0.65 and less than or equal to 0.90”, with the same values as before.

Standard Reference Test Tyre methodThe surface friction value for the wetted track shall be established by one or other of the following methods according to the class of the candidate tyre and the method (trailer or vehicle).
Tyre class SRTT Trailer method μpeak range Vehicle method BFC range C2, C3 SRTT16 0.65 – 0.90 - C2 SRTT16C 0.44 – 0.77 0.36 – 0.69 C3 SRTT19.5, SRTT22.5 0.51 – 0.67 0.35 – 0.61 C3 SRTT19.5 siped, SRTT22.5 siped 0.52 – 0.68 0.36 – 0.62
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Q2Why it changed

Proposed by
Task Force Tyre Abrasion; experts from the European Tyre and Rim Technical Organisation (ETRTO)
Working party
GRBP, 83rd session

Reasons

  • It is proposed to move all provisions related to tyre abrasion into a separate UN Regulation. ECE/TRANS/WP.29/GRBP/2025/27 is a proposal for a new UN Regulation on the approval of tyres with regard to abrasion performance.

    Sources (2)
    “It is proposed to move all provisions related to tyre abrasion into a separate UN Regulation (see ECE/TRANS/WP.29/GRBP/2025/27).”
    “Proposal for a new UN Regulation on the uniform provisions concerning the approval of tyres with regard to abrasion performance”

  • GRBP revised the Terms of Reference of the Task Force on Tyre Abrasion (TF TA) to introduce the establishment of a new UN Regulation.

    Source
    “GRBP noted the progress of the joint GRBP/GRPE Task Force on Tyre Abrasion (TF TA) (GRBP-82-33) and revised its Terms of Reference (GRBP-82-34-Rev.1) to introduce the establishment of a new UN Regulation”

  • The year references to the latest international standard specifications ASTM F2872-25, F2871-25 and F3678-25 are updated.

    Source
    “The year references to the latest international standard specifications ASTM F2872-25, F2871-25 and F3678-25 are updated.”

  • The expert from ETRTO proposed a correction to the 04 series of amendments to UN Regulation No. 117 (GRBP-82-27).

    Source
    “The expert from ETRTO proposed a correction to the 04 series of amendments to UN Regulation No. 117 (GRBP-82-27).”

  • Proposer's reason (informal document GRBP-83-48-Rev.1)

    Supplement 2 introduced new provisions for the track characterization and a new paragraph 1.1.1. in Annex 5, part (b). With document ECE/TRANS/WP.29/2025/76, an essential part of these provisions was accidentally deleted. The aim is to reinsert the text of Supplement 2 and to make the changes in paragraph 1.1.1.1. as they were intended originally.

    Submitted by Experts of ETRTO. Working party adoption: ECE/TRANS/WP.29/GRBP/83, para. 24.

    Sources (3)
    “Subsequently, by Supplement 2 (ECE/TRANS/WP.29/2024/65) new provisions for the track characterization and a new para 1.1.1. were introduced”
    “With document ECE/TRANS/WP.29/2025/76 an essential part of these provisions were accidentally deleted.”
    “The aim is to cure this accident by reinserting the text of Supplement 2 and implement the changes in para. 1.1.1.1. as they were intended originally.”

Document trail

  1. 2025-06ProposalECE/TRANS/WP.29/GRBP/2025/28Proposal by the Task Force Tyre Abrasion
  2. 2025-11ProposalECE/TRANS/WP.29/GRBP/2026/6Proposal by the experts from ETRTO
  3. —RevisedGRBP-83-48-Rev.1Consolidated proposal to replace GRBP/2025/28
  4. —Working party adoptsECE/TRANS/WP.29/GRBP/83GRBP session report, para. 24
  5. 2026-04Sent to WP.29ECE/TRANS/WP.29/2026/143Text that GRBP sent to WP.29 and AC.1
  6. 2026-06-24WP.29 adoptsECE/TRANS/WP.29/1192Adopted at the 199th session (session report, para. 103)
  7. PendingIn forceDate not yet known

Q3Who is affected

Vehicle manufacturer

  • No direct action for this role.

Component supplier

  • Update the details of the major features under paragraph 3.2.1.: tyre abrasion is no longer in the list.
  • Check that the SRTT16C, SRTT19.5 and SRTT19.5 siped are produced, controlled and stored to the new ASTM editions.

Technical service / Approval authority

  • Check wetted track friction against the Annex 5, paragraph 1.1.1. table for tyre class, SRTT and method (trailer or vehicle).

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ⓘ This report gives advice only. It is not legal or type-approval advice.

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