UN R117 Supplement 18 (02 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 18 to the 02 series of amendments
Supplement 17 → 18
- What changed
- Paragraph 2.18. now refers to ASTM F2872 – 25 for SRTT16C, F2871 – 25 for SRTT19.5 and F3678 – 25 for SRTT19.5 siped.
- Notwithstanding paragraph 12.19., paragraph 12.21. now also requires Contracting Parties applying this Regulation to continue to accept existing type approvals of class C3 tyres. These are 02 series approvals first granted before 1 September 2028, based on the Annex 7 snow performance test with reference tyre SRTT19.5 or SRTT22.5.
- Why
- The proposal updates the year references to the latest ASTM standard specifications F2872-25, F2871-25 and F3678-25.
- For each of these three standards, the proposal states “no performance change”.
- The proposal asks to amend paragraph 12.21. by considering the acceptance of existing type approvals in addition to the grant of their extension.
Q1What changed7 changes
ASTM standards for SRTT16C, SRTT19.5 and SRTT19.5 siped (para. 2.18.)
Paragraph 2.18. defines an SRTT as a tyre produced, controlled and stored in accordance with the standards of ASTM International. Item (c) now refers to F2872 – 25, item (d) to F2871 – 25 and item (f) to F3678 – 25. Before this supplement, these items referred to F2872 – 19, F2871 – 23 and F3678 – 23. The tyre sizes and the SRTT names in these items stay the same. Items (a) and (c) to (f) now end with a semicolon instead of a comma. Item (g) now ends with a semicolon instead of a full stop.
Existing type approvals of class C3 tyres based on the Annex 7 snow performance test (para. 12.21.)
Notwithstanding paragraph 12.19., Contracting Parties applying this Regulation must now continue to accept existing type approval of class C3 tyres. They must also continue to grant extensions to it. This applies to approvals according to the 02 series of amendments first granted before 1 September 2028. These approvals are based on the snow performance test in Annex 7 with SRTT19.5 or SRTT22.5 as reference tyre. The words “to accept existing type approval and” are new in this supplement.
Q2Why it changed
- Proposed by
- Experts of ETRTO
- Working party
- GRBP, 83rd session (February 2026)
Reasons
Reasons given by the proposer: Experts of ETRTO, in informal document GRBP-83-43. GRBP adopted GRBP-83-43, after a small editorial correction during the session, and asked the secretariat to submit it to WP.29 and AC.1 (ECE/TRANS/WP.29/GRBP/83, para. 25).
The proposal updates the year references to the latest ASTM standard specifications F2872-25, F2871-25 and F3678-25.
Source
“The year references to the latest international standard specifications ASTM F2872-25, F2871-25 and F3678-25 are updated.”
For F2872 – 25 (SRTT16C), the proposal lists a periodic review, with updates required to match the wording of other most recent SRTT evolutions. F2871 – 25 (SRTT19.5) and F3678 – 25 (SRTT19.5 siped) add a paragraph on max load and pressure, as in other SRTT standards. F2871 – 25 also updates a cross reference to the recently created SRTT standard SRTT19.5 siped. For each of the three standards, the proposal states “no performance change”.
Sources (4)
“periodic review: updates required to match the wording of other most recent SRTT evolutions”
“addition of a paragraph regarding max load and pressure, as in other SRTT standards”
“updated cross reference to recently created SRTT standard SRTT19.5 siped”
“no performance change”
The proposal asks to amend paragraph 12.21. by considering the acceptance of existing type approvals in addition to the grant of their extension.
Source
“It is proposed to amend paragraph 12.21. by considering the acceptance of existing type approvals in addition to grant their extension.”
Document trail
- —ProposalGRBP-83-43Proposal by the experts of ETRTO
- —Working party adoptsECE/TRANS/WP.29/GRBP/83GRBP session report, para. 25
- 2026-04Sent to WP.29ECE/TRANS/WP.29/2026/167Text that GRBP adopted and sent to WP.29 and AC.1
- 2026-06-24WP.29 adoptsECE/TRANS/WP.29/1192Adopted at the 199th session (session report, para. 103)
- PendingIn forceDate not yet known
Q3Who is affected
Vehicle manufacturer
- No direct action for this role.
Component supplier
- Update your test documents that cite F2872 – 19, F2871 – 23 or F3678 – 23 for SRTT16C, SRTT19.5 or SRTT19.5 siped.
Technical service / Approval authority
- Make sure that SRTT16C, SRTT19.5 and SRTT19.5 siped used in tests follow F2872 – 25, F2871 – 25 and F3678 – 25.
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ⓘ This report gives advice only. It is not legal or type-approval advice.