Presentation by ISO TC43/SC1/WG42

Text prepared by the experts of the Informal Working group on Measurement Uncertainties (IWB MU) in order to introduce a general guideline.

Text prepared by the Task Force on Tyre Pressure Monitoring System and Tyre Installation (TF TPMSTI) with the aim to implement the requirements for a Tyre Pressure Refill System (TPRS) and a Central Tyre Inflation System (CTIS)

Proposal for amendments to ECE/TRANS/WP.29/GRBP/2022/5

Propose a new scheme of approval for Retreaded snow tyres for use in severe snow conditions

Study to evaluate the potential and the feasibility of limit value reductions in type approval and the translation to real road traffic conditions

Purpose of study was to specify any potential improvement or deterioration of noise performance in light of the other parameters and to provide the necessary information regarding the possible additional tightening of the limits, without undermining the overall balance that has to take into account also other performances.

Proposal to clarify some prescriptions and correct some text inconsistencies

Proposal by the experts from the Informal Working Group on Additional Sound Emission Provisions (IWG ASEP) in order to amend Real Driving Additional Sound Emission Provisions (RD-ASEP) as a preliminary test procedure for the purpose of collecting experience on the complete new test and evaluation concept.

Proposal to change the date of compliance for category N1 or for vehicle types of category M1 derived from N1

Proposal to avoid placing requirements in the Definitions section and to facilitate the text by making use of the definition of “service description” that was introduced by Supplement 24.

TF TA will address the tyres abrasion performance by determining a standardized measurement method which will allow for the quantification of the microplastic emissions in the environment. At the same time, the TF TA will investigate the correlation between abrasion rate and durability and consider the inclusion of both abrasion rate and durability

Proposal to revise the limits for rolling resistance and wet grip, address tyres for vintage vehicles, and revise the definition for special-use C1 tyres.

Proposal to bring the latest ISO 10844 standard test surface into the Regulation.

Proposal to bring the latest ISO 10844 standard test surface into the Regulation.

Proposal to bring the latest ISO 10844 standard test surface into the Regulation.

Proposal from the Measurement Uncertainties informal group to introduce measures to reduce variability across assessments.

Proposal from the Studded Tyres task force to introduce provisions for C1 tyre ice-grip performance.

Proposal from the Worn Tyres working group to improve precision of the test procedures for measuring the wet adhesion of tyres in a worn state by using a moulded SRTT16 reference tyre (instead of a buffed tyre), to introduce new transitional provisions related to this change, to extend corrections already made to thee 02 series to the 03 series and make additional editorial corrections, and to define the range for tyre inflation vis-à-vis rim size to reduce uncertainties in measuring tread depth.

Proposal from the Worn Tyres working group to set the wet grip index threshold at 0.80 for class C1 tyres with a nominal aspect ratio equal to or less than 40, a section width equal to or higher than 235 mm and suitable for speeds equal to or greater than 300 km/h and for class C1 all terrain and special use tyres (see GRBP-75-27, slide 6). The proposal also introduces the k_worn factor in a new para. 3 in Annex 9 to address wet grip of C2 and C3 tyres in a worn state (see GRBP-75-26-Rev.1 for concept).

Proposal to address the definition of the radial structure (as a continuation to ECE/TRANS/WP.29/GRBP/2021/9), the definition of snow tyres, the requirements for special use tyres of class C1, the addition of an optional prefix for extra load tyres, a clarification of the description of the load/speed test for run flat tyres and extended mobility tyres (EMT) and editorial corrections.

Proposal to introduce a new definition of traction elements to characterize traction tyres.

Proposal to correct editorial mistakes in document GRBP/2021/17 that were not corrected by informal document GRBP74-31-Rev.1.

Proposal to introduce provisions to allow type approval of special use tyres that fulfil the requirements for snow performance as laid out in Annex 7. The respective marking related to the “Alpine” symbol has been considered for tyres complying with these requirements.

Proposal to introduce provisions to allow the type approval of special use tyres that fulfil the requirements for snow performance as laid out in Annex 7. The respective marking related to the “Alpine” symbol has been considered for those tyres complying with these requirements.

Proposal for a reference document.

Proposal to amend the provisions for a pause function for reversing warning systems with the aim to comply with the national environmental (noise) restrictions.

Proposal from the Worn Tyres working group to amend its previous formal proposal.

Previous name of this TF was TF-SL for Sound Limits

Proposal from the Worn Tyres working group to amend their earlier formal submission.

Proposal introduces a new definition for taxi tyres and establishes different threshold from other tyres.

Presentation of outcomes from a GRBP group of interested experts formed to consider contents of documents GRBP-73-21, GRBP/2021/16, and GRBP-75-14.

Proposal from the informal group on sound Measurement Uncertainties to amend their previous formal proposal.

Proposal for the Measurement Uncertainties informal group to amend their previous formal submission (GRBP/2022/9/Rev.1).

Proposals for editorial corrections to the provisions for type approval of special use tyres that fulfil the requirements for snow performance

Proposal for editorial corrections

Proposal introduces provisions to allow the type approval of special use tyres that fulfil the requirements for snow performance as laid out in Annex 7. The respective marking related to the “Alpine” symbol has been considered for those tyres complying with these requirements.

Exchange of information on national and international requirements on noise levels

Exchange of information on national and international requirements on noise levels

Initiated by the Federal Ministry for Digital and Transport (BMDV), the Federal Motor Transport Authority (KBA) tested various passenger cars (M1) and motorcycles (L3e) with regard to their noise emissions in 2021

CATC Data Study and Measurement Methods Research

The UI feature is being developed. The IWG on DETA is consulting the subsidiary bodies of
WP.29 concerning the proposed “summary documents” aimed at storing information associated with a Unique Identifier.

Proposal introduces provisions to allow the type approval of special use tyres that fulfil the requirements for snow performance as laid out in Annex 7. The respective marking related to the “Alpine” symbol has been considered for those tyres complying with these requirements

Re-introduces the definition of traction tyre as this can be still used between the entry into force date of the 04 series of amendments and 7 July 2024 .

Editorial corrections and amends the transitional provisions

Updates the reference to latest version of ISO 10844:2021

Proposes the amendment to the transitional provisions aligning with other proposals

Proposal to complete the additional sound emission provisions’ table of the communication form in the 05 series of amendments to UN R41 to avoid oversight in data collection and entries.

Proposal from the Informal Working Groups on Measurement Uncertainties (IWG MU) and Additional Sound Emission Provisions (ASEP) and from the International Organization for Standardization (ISO) for editorial corrections and clarifications based on the 03 series of amendments to UN R51 up to Supplement 7.

Proposal for the Worn Tyres working group to complete the proposal for Supplement 1 to the 03 series of amendments to UN R117 (adopted by GRBP in September 2022 and submitted to the March 2023 WP.29 session) by adding a detailed reference (F3611-22) for the molded standard reference test tyre (SRTT16).

Proposal from the Worn Tyres working group to complete the proposal for the 04 series of amendments to UN R117 (adopted by GRBP in September 2022 and submitted to the March 2023 WP.29 session) by adding a detailed reference (F3611-22) for the molded standard reference test tyre (SRTT16).

Proposal to ensure that the test procedures for retreaded tyres are aligned with the text adopted by WP.29 per document WP.29/2021/8 for UN R117.

The existing transitional provisions do not address tyres produced in accordance with the applicable requirements and placed in distribution channels before 7 July 2026. Therefore, a new transitional provision is proposed based on the clause R.4 of part C – “Transitional provisions for replacement parts for vehicles in use” of the General Guidelines for United Nations Regulatory Procedures and Transitional Provisions in UN Regulations. It will clarify that new tyres manufactured before 7 July 2026 and approved according to the 02 or 03 series of amendment will be allowed to be sold and fitted on vehicles in use for additional period not exceeding 30 months from 7 July 2026.

Proposal to address the following:

1. “Special use” tyres with nominal rim diameters larger than those listed in the present table (rim diameters up to 42, section widths up to 750 mm and overall diameters over 2 meters) and with speed symbols F and above have been announced in the European market as original equipment of N3G “special purpose vehicles” (i.e., special high speed self-propelled vehicles for agricultural and forestry use, like wood choppers).

2. Existing multi-purpose tyres (MPT) (classified as “special use tyres” as per paragraphs 2.5.3. and 3.1.13.), already type approved since years, have a tread pattern with lugs or cleats in addition to those with blocks, as evidenced by the attached slide showing some examples. It is proposed to amend paragraph 6.3.1. by clarifying that lugs and cleats are possible shapes of the mentioned blocks.

3. Testing tyres with very large overall diameters, sometimes over 2 m, on a test drum with a diameter of 1.70 m ± 1 % would be unpracticable. For practical reasons most of those
tyres are regularly tested on drums with a diameter of 3 m or even larger. The proposal carries equivalence provisions from UN R106 to justify the equivalence of the test method as required by Annex 7 in point 4 “Equivalent test methods" and clarifies based on UN R117 the formula already used indirectly.

4. Some commercial vehicles are often used in the market at a reduced speed of 70 km/h with a load-capacity of the tyres increased as per load/speed combination defined in the table of Annex 8. The proposal would allow use of the speed category symbol E (but restrict it to “additional service description”) to provide this information.

5. Considering that 32 km/h is already a floor value for the test-drum speed for diagonal tyres, ETRTO proposes not to apply to E speed category symbol tyres the linear decrease of
the test-drum speed in function of the decrease of the speed category symbol by keeping, for safety reasons, the same test-drum speed as for F speed category symbol tyres, i.e., 32 km/h).

6. In the case of additional service descriptions mentioned in paragraph 6.2.5.1., it is proposed not to perform the additional load/speed test because the load-capacity approximates with a negligeable difference the reduction or the increase in percentage of the nominal load/speed combination applicable to the nominal speed category symbol (see Annex 8).

7. Type approval applications for radial tyres with load capacity index greater or equal to 122 and without the additional marking “LT”, or “C” have been done in the past for the speed category symbol N for which the load/speed endurance test procedure is not described in Annex 7, Appendix 1. To type approve such tyres the test speed was separately defined by the different involved Type Approval Authorities. In order to harmonize the test procedure to be used for the type approval of such tyres, it is proposed to amend the Annex 7, Appendix 1 by introducing testing conditions in line with the rule applied for defining the test speed of radial tyres with load capacity index greater or equal to 122 (i.e. starting from 32 km/h set for F speed category symbol, the test speed is increased by 8 km/h respect to the one set for the previous speed category symbol).

8. The definition of “snow tyre” is amended to clarify that “snow tyres” are not only suitable for the use in snow conditions but also on mud and by replacing the term “maintain vehicle motion” (i.e. keeping the vehicle speed and direction of movement constant) by a more general concept of “controlling vehicle motion” (i.e. also being able to change the vehicle speed and direction of movement as intended).

9. It is proposed to explicitly allow other technical measurement solutions of the tyre overall width by removing the words “by caliper” which fix a technical limitation. The removal of this technical limitation would be advisable following the principle of not stopping the technical innovations.

10. Editorial corrections are introduced to ensure that the terms “load-capacity” and “speed category symbol” are used consistently throughout the text and to remove some typing mistakes present in the current text.

Proposal to explicitly allow other technical measurement solutions of the tyre overall width by removing the words “by calliper”, add the definition of “special tyre”, clarify the definition of “snow tyre”, to enable the case of a “special tyre” fulfilling the definition of a “snow” tyre, clarify application of the suffix “M/C”, and make editorial corrections and clarifications.

Proposal to delete obsolete footnotes concerning worn tyre wet grip and approvals under UN R117 coincident with approvals under UN R54. The 04 series of amendments to UN R117 introduces the requirements on adhesion of tyres in worn state on wet surfaces for tyres within the scope of UN R54.

Proposal to extend the scope of the speed category E to align with the technical evolution of agricultural and forestry vehicles.

The prescription given in paragraph 3.5.2., which will be implemented through document WP.29/2022/7/Rev.1 adopted by WP.29, contradicts the previously existing prescription in paragraph 3.2.9. This proposal aims to resolve the contradiction by amending paragraph 3.5.2. to introduce a reference to the prescriptions given in paragraph 3.2.9.

1. Proposal to amend the 04 and 05 series of UN R41 and the 02 series of UN R63 to allow use of the latest state of the art ISO 10844 test track.
2. ISO has updated the ISO 10844 standard to reduce track-to-track variability caused by differing interpretations and implementations of the technical requirements. The tyre/road contribution to the overall sound performance of a motorcycle is lower compared to cars.
3. The improvements from the ISO 10844:2014 to the 2021 version would not result in a need for updating the surface for L-category test tracks: Updating the ISO 10844 reference would have negligible impact on the measurement procedure and measurement results.
4. If however the ISO reference in the L-category noise regulations would be updated without maintaining the current ISO 10844:2014 as an option, IMMA sees a potential risk of tracks needing recertification, creating administrative burden with no practical benefit.
5. If later on, the tracks would need re-surfacing anyway (e.g. due to wear), then these can be built and certified according to ISO10844:2021. Because of the above, IMMA would like to allow certification with the tracks complying to either ISO10844:2014 or ISO10844:2021.
6. This proposal takes the opportunity to introduce proposals for additional corrections in R41/04 and R41/05 as specified below:
   • Supplement 9 to the 04 series of amendments to UN Regulation 41 introduced a new paragraph 12.4, needing to renumber the (former) paragraphs 12.4 to 12.9 (WP.29/2021/4). Due to this renumbering, the reference to paragraph 12.7 in Annex 6 footnote a, and Annex 7 paragraph 2.6 is no longer correct and should be replaced by a reference to paragraph 12.8.
   • With the introduction of the 05 series of amendments the Transitional Provisions were rewritten and footnote a of Annex 6 became obsolete.