UN R124 Supplement 2 (00 series) · UNECE Regulation No. 124 (ECE R124) — Uniform provisions concerning the approval of wheels for passenger cars and their trailers.
UN R124 — Supplement 2 to the 00 series of amendments
Supplement 1 → 2
- What changed
- In the Annex 8 impact test, the acceptance criteria now name “total loss of inflation pressure due to tyre depressurization” instead of “any loss of inflation pressure”.
- Why
- The purpose is to align the acceptance criterion in the table in Annex 8, paragraph 3, with the negative rating criterion in paragraph 5 (c).
- The change clarifies that only a complete pressure decrease in the tyre due to its depressurization is a negative evaluation criterion in an impact test.
Q1What changed1 change
Acceptance criteria of the impact test (Annex 8, para. 3)
In the acceptance criteria of the Annex 8 impact test, “any loss of inflation pressure” now reads “total loss of inflation pressure due to tyre depressurization”. The words “within one minute of completing the test” stay the same.
Q2Why it changed
- Proposed by
- Experts from the Russian Federation
- Working party
- GRBP, 72nd session (September 2020)
Reasons
The purpose is to align the acceptance criterion in the table in Annex 8, paragraph 3, with the negative rating criterion in paragraph 5 (c). That criterion is total loss of inflation pressure within one minute.
Source
“The purpose of this change is to align the acceptance criterion listed in the table in Annex 8, paragraph 3, with the negative rating criterion listed in paragraph 5 (c): total loss of inflation pressure within one minute.”
The change clarifies that only a complete pressure decrease in the tyre due to its depressurization is a negative evaluation criterion in an impact test.
Source
“This change clarifies that only a complete decrease in the pressure in the tyre due to its depressurization is a negative evaluation criterion when conducting an impact test.”
Document trail
- 2020-06ProposalECE/TRANS/WP.29/GRBP/2020/8Proposal by the experts from the Russian Federation
- —Working party adoptsECE/TRANS/WP.29/GRBP/70Session report, para. 20
- 2020-12Sent to WP.29ECE/TRANS/WP.29/2021/9Text that GRBP sent to WP.29 and AC.1
- 2021-03WP.29 adoptsECE/TRANS/WP.29/1157Adopted at the 183rd session (session report, para. 137)
- 2021-09-30In forceC.N.342.2021.TREATIES-XI.B.16.124UN depositary notification
Q3Who is affected
Vehicle manufacturer
- No direct action for this role.
Component supplier
- No direct action for this role.
Technical service / Approval authority
- No direct action for this role.
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ⓘ This report gives advice only. It is not legal or type-approval advice.