UN R30 Supplement 22 (02 series) · UNECE Regulation No. 30 (ECE R30) — Uniform provisions concerning the approval of pneumatic tyres for motor vehicles and their trailers.
UN R30 — Supplement 22 to the 02 series of amendments
Supplement 21 → 22
- What changed
- Paragraph 6.2.3. now starts with “Except for tyres with radial structure or run flat tyres”. The ±3.5 per cent limit for the outer diameter, measured six hours after the load/speed performance test, does not apply to these tyres.
- In paragraph 2.9.2., the “bias-belted” definition no longer says “of diagonal (bias-ply) type”, and the belt comprises “one or more layers” in place of “two or more”.
- New paragraph 11.4. applies until 3 months after the date of entry into force of Supplement 22. Until then, Contracting Parties applying this Regulation may continue to grant and/or extend type approvals according to the 02 series without Supplement 22.
- Why
- For radial and run flat tyres, the variation of outer diameter, measured six hours after the load/speed performance test, is far below ±3.5 per cent.
- One change aims to converge to consistent definitions across tyre UN Regulations.
- Even after the notification of a supplement's adoption, Type Approval Authorities and Technical Services may need further time to implement its requirements.
Q1What changed7 changes
Outer diameter after the load/speed performance test (para. 6.2.3.)
Paragraph 6.2.3. now starts with “Except for tyres with radial structure or run flat tyres”. For other tyres, the outer diameter measured six hours after the load/speed performance test must stay within ±3.5 per cent of the diameter before. The test is the one specified in paragraph 2. of Annex 7. Before this supplement, the paragraph had no exception.
Bias-belted tyres: definition and overall width (paras. 2.9.2. and 6.1.4.2.1.)
Paragraph 2.9.2. has a new definition of a “bias-belted” tyre structure. Its ply cords that extend to the beads are laid at alternate angles of substantially less than 90° to the centre line of the tread. The structure is restricted by a belt comprising one or more layers of substantially inextensible cord material. Before, it described a structure of diagonal (bias-ply) type in which the carcass was restricted by a belt comprising two or more layers. These layers were laid at alternate angles close to those of the carcass. Paragraph 6.1.4.2.1. now reads “In diagonal (bias-ply) and bias-belted tyres: 6 per cent”, and before it did not name bias-belted tyres.
Ply-rating number in the application for approval (para. 4.1.10.)
The application for approval must specify the ply-rating number of diagonal (bias-ply) tyres, except for T-type temporary use spare tyres. Before this supplement, paragraph 4.1.10. had no exception for T-type temporary use spare tyres.
Test room temperature (Annex 7, para. 3.2.)
In Annex 7, paragraph 3.2., the test room temperature for conditioning the tyre-and-wheel assembly is now 38 ºC ± 3 ºC. Before, the text read “38 ºC + 3 ºC”.
Paragraph 3.1.15. renumbered to 3.1.14.
Paragraph 3.1.15. is renumbered to 3.1.14. This paragraph gives the symbol for an EMT, where “h” is at least 12 mm.
Transitional provision for Supplement 22 (para. 11.4.)
New paragraph 11.4. applies until 3 months after the date of entry into force of Supplement 22. Until then, Contracting Parties applying this Regulation may continue to grant and/or extend type approvals according to the 02 series of amendments. They may do so without taking into account the provisions of Supplement 22.
Q2Why it changed
- Proposed by
- Experts from the European Tyre and Rim Technical Organisation (ETRTO)
- Working party
- GRBP, 71st session (January 2020)
Reasons
For radial and run flat tyres, the variation of outer diameter, measured six hours after the load/speed performance test, is far below ±3.5 per cent.
Source
“For radial and run flat tyres the variation of outer diameter of the tyre, measured six hours after the load/speed performance test as specified in paragraph 2 of Annex 7, is far below ±3.5 per cent”
One change aims to converge to consistent definitions across tyre UN Regulations, as presented in informal document GRRF-82-21. This is in line with the proposed amendment to UN Regulation No. 75.
Sources (2)
“The purpose of this change is to converge to consistent definitions across tyre UN Regulations as presented in Informal document GRRF-82-21”
“This is in line with the proposed amendment to UN Regulation No. 75.”
The reference to bias-belted tyres was added for correctness.
Source
“The reference to bias-belted tyres has been added for correctness.”
The ply-rating number is not relevant for T-type temporary use spare tyres. The reason is that all these tyres are tested at the same inflation pressure, independent of their construction.
Source
“The ply-rating number is not relevant for T-type temporary use spare tyres because all these tyres are tested at the same inflation pressure independent of their construction.”
The transitional provision in paragraph 11.4. would delay for three months the mandatory application of the supplement. The proposal addresses the gap between the entry into force of a supplement and the notification of its adoption to the Contracting Parties. Currently, during this period, a type approval cannot be granted pursuant to the new supplement in force, although it is mandatory. Even after the notification, the Type Approval Authorities and Technical Services may need further time to implement the requirements of the new supplement.
Sources (4)
“an accompanying transitional provision (paragraph 11.4.) that would delay for three months the mandatory application of the Supplement”
“addressing the gap between the effective date of entry into force and the date of notification of the adoption of the Supplement to the Contracting Parties”
“Currently, during this period, the type approval cannot be granted pursuant to the new Supplement in force, although it is mandatory.”
“Even after the notification of the adoption of the Supplement, the Type Approval Authorities and Technical Services may need further time to implement the requirements of the new Supplement.”
Document trail
- 2019-11ProposalECE/TRANS/WP.29/GRBP/2020/3Proposal by ETRTO
- —Amended in sessionGRBP-71-30ETRTO amendments to ECE/TRANS/WP.29/GRBP/2020/3 for the 71st GRBP session
- —Working party adoptsECE/TRANS/WP.29/GRBP/69Session report, para. 12 and Annex VI
- 2020-03Sent to WP.29ECE/TRANS/WP.29/2020/72Text that GRBP sent to WP.29 and AC.1
- 2020-06WP.29 adoptsAdopted at the 181st session
- 2021-01-03In forceC.N.21.2021.TREATIES-XI.B.16.30UN depositary notification
Q3Who is affected
Vehicle manufacturer
- No direct action for this role.
Component supplier
- Check that the structure stated in your application matches the new “bias-belted” definition (para. 2.9.2.).
- Update approval applications: for T-type temporary use spare tyres, the ply-rating number is not required (para. 4.1.10.).
Technical service / Approval authority
- Do not apply the outer diameter limit of paragraph 6.2.3. to tyres with radial structure or run flat tyres.
- Under Annex 7, paragraph 3.2., use a test room temperature of 38 ºC ± 3 ºC for conditioning the tyre-and-wheel assembly.
- Apply the 6 per cent overall width limit of paragraph 6.1.4.2.1. to bias-belted tyres too.
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ⓘ This report gives advice only. It is not legal or type-approval advice.