UN Regulation No. 117
Tire Rolling Sound Emissions, Adhesion on Wet Surfaces, and Rolling Resistance

Series of Amendments, Supplements, and Corrigenda

Based upon a proposal from the ETRTO and the UK, this text was adopted by the Working Party on Noise (GRB) at its 57th session to update noise test-track requirements from ISO 19844:1994 to ISO 10844:2011 and incorporate transitional provisions to allow repaving of existing, non-compliant test tracks with the ISO 10844:2011 standards.

67. Agenda item 4.8.1, Regulation No. 117, document ECE/TRANS/WP.29/2013/55, add at the end:

Annex 4, the title, insert the reference to footnote ¹ and footnote ¹, to read:
“¹ The specifications for the test site reproduced in this annex are valid until the end of the period indicated in paragraph 12.9.”

Text as adopted by the Working Party on Brakes and Running Gear (GRRF) at its 74th session based upon a European Tyre and Rim Technical Organisation (ETRTO) proposal to amend the snow test method for C3 tyres in order to prescribe the wider of the possible speed ranges (document GRRF/2012/19). Please note that this proposal was adopted at the November 2013 (161st) WP.29 session as Supplement 5, having originally been proposed as Supplement 4 during the June session.

The proposal under agenda item 4.9.4 should be considered at the November 2013 session.

[Proposal adopted.]

Submission of the wet grip limit values for Class C3 tires as agreed to within the Working Party on Brakes and Running Gear (GRRF). These values were originally proposed in document WP.29/2013/66.

55. The World Forum considered the pending proposal for amendments to Regulation No. 117 listed under agenda item 4.12.3 (document ECE/TRANS/WP.29/2013/66) and recommended its submission to AC.1 for voting, subject to the correction of para. 47 below (see WP.29-162-05).

56. Page 1, the title, replace “Supplement 5” by “Supplement 6”. Page 2, paragraph 6.2.3, correct the wet grip index G for normal tyres other than traction tyres to read 0.80.

[The proposal was adopted as amended as “Supplement 6 to the 02 series of amendments to UN Regulation No. 117” by a vote of 36 in favor and none either opposed or abstaining.]

24. Recalling the purpose of ECE/TRANS/WP.29/2013/66, the Chair of GRRF stressed that WP.29 was expecting GRRF to conclude its deliberation about the wet grip limit values. The GRRF experts introduced their positions (GRRF-76-05, GRRF-76-07, GRRF-76-08, GRRF-76-11, GRRF-76-12, GRRF-76-26, GRRF-76-27, GRRF-76-28). The expert from the EC reported on the concerns expressed by the Directorate-General for Mobility and Transport of the European Commission (DG Move). GRRF confirmed the limit values proposed in para. 6.2.2. for Tyres of C2 category and agreed to amend the proposed limit values in para. 6.2.3. for Tyres of C3 category in ECE/TRANS/WP.29/2013/66. GRRF requested the secretariat to submit this amendment as reproduced in WP.29-162-05 to WP.29 and AC.1 for consideration at their March 2014 session.

24bis. The expert from the Russian Federation presented GRB-59-02 proposing a tyre rolling resistance test results evaluation using a mathematical algorithm, to be added as an alternative to the existing one in the text of the Regulation. He also presented the results of a validation study of the proposed algorithm for tyres of the C1 category performed in France, in cooperation with the Russian Federation (GRB-59-07 and GRB-59-08). GRRF noted that this proposal may be submitted by GRB to WP.29 as a supplement to UN Regulation No. 117. GRRF recommended further steps for a better understanding of the proposed method’s sensitivity, suggesting: (i) extending the validation study for tyres of categories C2 and C3 and (ii) verifying the application of the proposed alternative in the conditions of the conformity of production. The GRRF Chair invited the experts to provide their comments on the proposal to the GRB secretariat with a copy to the expert from the Russian Federation.

Proposal as approved by the GRB to introduce a “Deceleration Calculator” (dω/dt) for use in the UN R117 test procedures. This procedure was developed by Russia and validated by an ad hoc group (including NAMI, UTAC, and ETRTO). This proposal also includes clarifications concerning snow tire markings approved by the GRRF during its 78th session.

28. The Secretary presented ECE/TRANS/WP.29/2015/5 based on the proposals adopted by GRRF and the Working Party on Noise (GRB) and containing a correction introduced by the secretariat. GRRF endorsed the correction proposed (see para. 2.16.).

Proposal for a new time measurement accuracy for instrumentation involved in the rolling resistance method (Annex 6 of the UN Regulation) and to restore transitional provisions incorrectly deleted by Supplement 6 to the 02 series of amendments. The proposal also updates the test-track references to the recently published ISO 10844:2014.

66. Agenda item 4.8.7, Regulation No. 117, ECE/TRANS/WP.29/2015/65, insert the following correction:
Annex 4, the title, footnote 1, shall read: “replace “paragraph 12.9” with “paragraph 12.8””

Proposal to:
a) Align definitions and content with the other tyre regulations (UN Regulations Nos. 30, 54, 75 etc.);
b) Include a definition of “manufacturer” extracted from the resolution “R.E.3”;
c) Adopt a common definition and use of the terms “Manufacturer’s name”, “Brand name”, “Trademark”, “Trade description” and “Commercial name” and their links; and
d) Add information in the certificate to enable approval authorities to more easily understand the products the certificate addresses.

Proposal to

1. correct a type in Annex 7- Appendix 2, Part 2, Paragraph 5 where the snow group index should read “1.00”, not “100” as appeared erroneously in the adopted text
2. correct the text where the word “tyres” was inadvertently omitted from Paragraph 2.1.
3. align the provisions of UN R117 regarding approval numbers and markings with the provisions of Schedule 4 to the revised 1958 Agreement.

Proposal for an amendment to complement the content of working document GRVA/2018/5. The proposal includes amendments to:

1. The Standard Reference Test Tyre (SRTT) denominations
2. Remove the discrimination between the two Class C3 tyres
3. Clarify that there are no C3 tyres in the scope of this UN Regulation “not marked with speed symbol”
4. Align Annex 6 with the most recent amendments made to standard ISO 28580
5. Define “standard deviation” as appropriate in the text
6. Clarify that, in the cases of C2 and C3 tyres, the “Reference (test) pressure” and the value “Pr” correspond to the indication of the inflation pressure which is always marked on the sidewall
7. Use “repeatable” instead of references to “reproducibility”
8. Update test report forms
9. Include the date on which the new proposed supplement of UN Regulation No. 117 will apply
10. Improve the description of the evaluation of the rolling sound emission test
Correct the figure in Annex 2, Appendix 2, and
11. Update cross references pursuant to paragraph renumbering.

Proposal to adapt the rolling-sound measurement procedures to accommodate special C2 tyres presenting a section width wider than 200 mm, aspect ratio lower than 55, rim diameter code lower than 15 and without any dual fitting indication (i.e. the front size 175/75R15 LT and the rear size 235/50R14 LT or the front size 175/75R15 LT and the rear size 265/50R14 LT).

1. Improve the reproducibility of the test method (in alignment with ISO 23671)
2. Include maximum load and pressure information per ASTM F2493-19
3. Update the test report templates accordingly
4. Remove the limitation for “moulded” markings
5. Transition from SRTT14 to SRTT16
6. Align track friction requirements for track characterization per the transition
7. Clarify vehicle selection provisions
8. Introduce transitional provisions

78. The World Forum considered draft amendments under agenda items 4.6.1 to 4.6.7. and recommended their submission to AC.1 for voting, subject to the following corrections of ECE/TRANS/WP.29/2021/8 under agenda item 4.6.6 (WP.29-183-06):
In paragraph 4.4.1., replace “markings” with “approval mark”.
In paragraph 9.1., delete from the proposal (i.e. keep the paragraph in its current form).

79. The Chair of GRBP presented draft amendment proposals contained in documents ECE/TRANS/WP.29/2021/3, ECE/TRANS/WP.29/2021/10 and Rev.1, ECE/TRANS/WP.29/2021/11 under agenda item 4.6.8 to 4.6.10., to amend UN Regulations Nos. 41, 141 and 142. The World Forum recommended their submission to AC.1 for voting.

Proposal to replace “markings” by “approval mark” in paragraph 4.4.1. to clearly specify the intended application of the provision (i.e., to the approval mark, not to all markings).

78. The World Forum considered draft amendments under agenda items 4.6.1 to 4.6.7. and recommended their submission to AC.1 for voting, subject to the following corrections of ECE/TRANS/WP.29/2021/8 under agenda item 4.6.6 (WP.29-183-06):
In paragraph 4.4.1., replace “markings” with “approval mark”.
In paragraph 9.1., delete from the proposal (i.e. keep the paragraph in its current form).

79. The Chair of GRBP presented draft amendment proposals contained in documents ECE/TRANS/WP.29/2021/3, ECE/TRANS/WP.29/2021/10 and Rev.1, ECE/TRANS/WP.29/2021/11 under agenda item 4.6.8 to 4.6.10., to amend UN Regulations Nos. 41, 141 and 142. The World Forum recommended their submission to AC.1 for voting.

Proposal to introduce provisions for ice grip tyres, clarify provisions on Conformity of Production, sample submissions, and testing methods, and to make editorial corrections and improvements.

Proposal to introduce a procedure and thresholds on wet grip performance for C1 tyres in worn state.

132. The Chair of GRBP presented the draft amendments to UN Regulation No. 117 on wet grip of worn tyres (agenda item 4.9.1). The representative of Japan supported these amendments, pointed out their importance for road safety and called for continuation of the work of GRBP on this matter, in particular improving the test methods.

Proposal to revise the limits for rolling resistance and wet grip, to address tyres for vintage vehicles, to revise the definition for special-use C1 tyres, and 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. 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), provisions to allow the type approval of special use tyres that fulfil the requirements for snow performance as laid out in Annex 7, and a new definition of traction elements to characterize traction tyres.

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, to bring the latest ISO 10844 standard test surface into the Regulation, and to make editorial corrections.

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, 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 the 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. The proposal introduces the tyre reference F3611-22 per document GRBP/2023/2 submitted to the January 2023 session of GRBP.

Proposal from the Measurement Uncertainties informal group to introduce measures to reduce variability in noise measurements.

23. The expert from IWG MU proposed measures to reduce variability (ECE/TRANS/WP.29/GRBP/2023/19 and GRBP-78-05). GRBP adopted the proposal, as laid down in GRBP-78-05, and requested the secretariat to submit it for consideration and vote at the June 2024 sessions of WP.29 and AC.1 as draft Supplement 2 to the 04 series of amendments to UN Regulation No. 117.

Proposal from the informal group on Measurement Uncertainties, superseding the proposal in document GRBP/2023/19.

23. The expert from IWG MU proposed measures to reduce variability (ECE/TRANS/WP.29/GRBP/2023/19 and GRBP-78-05). GRBP adopted the proposal, as laid down in GRBP-78-05, and requested the secretariat to submit it for consideration and vote at the June 2024 sessions of WP.29 and AC.1 as draft Supplement 2 to the 04 series of amendments to UN Regulation No. 117.

Proposal to complete the amendment proposal adopted at the seventy-eighth session of the Working Party on Noise and Tyres (informal document GRBP-78-05 replacing ECE/TRANS/WP.29/GRBP/2023/19).

Proposal from Task Force on Tyre Abrasion (TFTA) to introduce test methods to measure tyre abrasion.

Proposal to complete the amendment proposal adopted at the 78th GRBP session (informal document GRBP-78-05 replacing ECE/TRANS/WP.29/GRBP/2023/19).

Amendments from the Task Force on Tyre Abrasion (TFTA) to the proposal to introduce test methods to measure tyre abrasion.

Proposal to replace document ECE/TRANS/WP.29/GRBP/2024/06

Proposal to introduce a new temperature correction formula for the rolling sound emissions of tyres of classes C1 and C2, to remove the content of the now obsolete Annex 4 as well as all its references, to update references to standards, and to make editorial improvements for clarity and consistency across tyre regulations.

Proposal to improve the reproducibility of the snow grip test method by replacing the current reference tyres C3 SRTTs 19.5 and 22.5 with the new reference tyres C3 SRTTs 19.5 and 22.5 siped.

Proposal to replace document ECE/TRANS/WP.29/GRBP/2024/07

Proposal to improve the reproducibility of the snow grip test method by replacing the current reference tyres C3 SRTTs 19.5 and 22.5 with the new reference tyres C3 SRTTs 19.5 and 22.5 siped.

Proposal for editorial improvements and updates to ISO and ASTM standards references and to align with Supplement 2 to the 04 series of amendments, including a new temperature correction formula for the rolling sound emissions of tyres of classes C1 and C2 and to remove the content of the now obsolete Annex 4 as well as all its references.

Proposal to replace document ECE/TRANS/WP.29/GRBP/2024/09