Only the original UN/ECE texts have legal effect under international public law. The status and date of entry into force of this Regulation should be checked in the latest version of the UN/ECE status document TRANS/WP.29/343, available at: https://unece.org/status-1958-agreement-and-annexed-regulations

Incorporating all valid text up to:

Supplement 1 to the original version of the Regulation – Date of entry into force: 11 January 2026

This document is meant purely as documentation tool. The authentic and legally binding texts are:

ECE/TRANS/WP.29/2024/75

ECE/TRANS/WP.29/2025/78 (as amended by paragraph 72 of the report ECE/TRANS/WP.29/1186)

CONTENTS

Regulation

1.

Scope

2.

Definitions

3.

Markings

4.

Application for approval

5.

Approval

6.

Specifications

7.

Modifications and extension of approval

8.

Conformity of production

9.

Penalties for non-conformity of production

10.

Production definitively discontinued

11.

Names and addresses of technical services responsible for conducting approval tests, of test laboratories, and of Type Approval Authorities

Annexes

1

Communication

Appendix 1 - Technical information document: retreaded tyres produced by using a pre-cured tread

Appendix 2 - Technical information document: retreaded tyres produced by using mould cure process

2

Arrangements of approval marks

Appendix 1 - Examples of a separate UN Regulation No 172 approval mark

Appendix 2 - Approval according to UN Regulation No 172 coincident with approval of UN Regulations Nos 108 or 109

Appendix 3 - Combinations of markings of approvals issued in accordance with UN Regulations Nos 108 or 109 and 172

1.   Scope

This Regulation applies to retreaded pneumatic tyres (1)  (2) of Classes C1, C2 and C3 produced by using pre-cured tread and/or mould cure process with regard to their snow performance and/or for C2 and C3 tyres with regard to their classification as traction tyre.

It does not, however, apply to the following tyres when retreaded either by using the pre-cured tread or the mould cure process:

1.1.1.

Tyres of category of use "temporary use tyres" as declared in UN Regulation No 108 for Class C1 tyres;

1.1.2.

Tyres having a nominal rim diameter code ≤ 10 (or ≤ 254 mm) or ≥ 25 (or ≥ 635 mm);

1.1.3.

Tyres designed for competitions;

1.1.4.

Tyres intended to be fitted to road vehicles of categories other than M, N and O (3);

1.1.5.

Tyres with a nominal speed category symbol less than 80 km/h (speed symbol F);

1.1.6.

Professional off-road tyres;

1.1.7.

Tyres fitted with additional devices to improve traction properties (e.g. studded tyres).

2.   Definitions

For the purpose of this Regulation, in addition to the definitions contained in Regulations Nos 108 and 109 and, with respect to the snow performance and the classification as traction tyre, in UN Regulation No 117, the following definitions apply.

2.1.

"Type of retreaded tyre" means retreaded tyres which do not differ in such essential characteristics as: (a) The supplier of the tread used for the retreading process; (b) The tyre class; (c) The tyre structure; (d) The category of use: normal or snow or special use; (e) Whether tyre for use in severe snow conditions or not; (f) For classes C2 and C3 tyres, whether traction tyre or not; (g) The tread pattern (see section 4.2.1. of this Regulation).

2.2.

"Supplier of the tread used for retreading process" means the person or body who is responsible to the Type Approval Authority for all aspects of the type-approval under this Regulation and for ensuring the conformity of production.

2.3.

"Tread used for retreading process" means either a pre-cured tread or the specification of the major features of the tread used for mould cure process.

2.4.

"Range of retreaded tyres" means a range of retreaded tyres as quoted in paragraph 2. of Appendix 1 or Appendix 2 to Annex 1 of this Regulation.

2.5.

"Retreader" means the person or body who is responsible to the Type Approval Authority for all aspects of the type-approval under UN Regulations Nos 108 and/or 109.

2.6.

"Tyre manufacturer" means the person or body who was responsible to the Type Approval Authority having granted the original type approval of new tyres and for ensuring the conformity of production under the applicable Regulation for new tyres (4).

2.7.

"Brand name/trademark" means the identification of the brand or trademark as defined by the supplier of the tread used for the retreading process.

2.8.

"Trade description/commercial name" means an identification of the tread used for the retreading process as given by the supplier. It may coincide with the brand name/trademark.

2.9.

Category of use:

2.9.1.

"Normal tyre" is a tyre intended for normal road use only.

2.9.2.

"Snow tyre" means a tyre whose major features including tread pattern are primarily designed to achieve in mud and/or snow conditions a performance better than that of a normal tyre with regard to its ability to initiate and control vehicle motion.

2.9.3

"Special use tyre" is a tyre intended for mixed use both on- and off-road or for other special duty. These tyres are primarily designed to initiate and maintain the vehicle in motion in off-road conditions.

2.10.

"Tyre for use in severe snow conditions" means a snow tyre or a special use tyre whose tread pattern, tread compound and construction are specifically designed to be used in severe snow conditions and that fulfils the requirements of paragraph 6.1. of this Regulation.

2.11.

"Traction tyre" means a tyre in class C2 or C3 bearing the inscription TRACTION and intended to be fitted primarily to the drive axle(s) of a vehicle to maximize force transmission in various circumstances and that fulfils the requirements of paragraph 6.2 of this Regulation.

2.12.

"Professional off-road tyre" is a special use tyre primarily used for service in severe off-road conditions.

2.13.

"Tyre class" means one of the following groupings:

2.13.1.

Class C1 tyres: new tyres conforming to UN Regulation No 30 or retreaded tyres produced in conformity with UN Regulation No 108, as applicable;

2.13.2.

Class C2 tyres: new tyres conforming to UN Regulation No 54 or retreaded tyres produced in conformity with UN Regulation No 109, as applicable, and identified by a load capacity index in single formation lower or equal to 121 and a speed category symbol higher or equal to "N";

2.13.3.

Class C3 tyres: new tyres conforming to UN Regulation No 54 or retreaded tyres produced in conformity with UN Regulation No 109, as applicable, and identified by: (a) A load capacity index in single formation higher or equal to 122 or; (b) A load capacity index in single formation lower or equal to 121 and a speed category symbol lower or equal to "M".

2.14.

"Tread depth" means the depth of the principal grooves.

2.15.

"Principal grooves" means the wide circumferential grooves positioned in the central zone of the tyre tread, which, in the case of passenger and light truck (commercial) tyres, have the treadwear indicators located in the base.

2.16.

"Void to fill ratio" means the ratio between the area of voids in a reference surface and the area of this reference surface calculated from the mould drawing.

3.   Markings

3.1.

Retreaded tyres in scope of this regulation shall display on both sidewalls in the case of symmetrical tyres and at least on the outer sidewall in the case of asymmetrical tyres:

3.1.1.

The "Alpine" symbol (3-peak-mountain with snowflake) described in Annex 7, Appendix 1 to UN Regulation No 117 and the inscription M+S or MS or M.S. or M & S, if the tyre is classified as tyre for use in severe snow conditions.

3.1.1.1.

In addition, in case a pre-cured tread is used for the retreading process, the inscription M+S or MS or M.S. or M & S and the "Alpine" symbol may be marked on the tread shoulder with the following minimum dimensions: (a) inscription M+S or MS or M.S. or M & S: minimum height of 4 mm (b) "Alpine" symbol: 10 mm base and 10 mm height.

3.1.2.

The inscription "TRACTION", with the minimum height of 4 mm, if the tyre is classified as traction tyre.

3.1.2.1.

In addition, in case a pre-cured tread is used for the retreading process, the inscription "TRACTION" may be marked on the tread shoulder with the minimum height of 4 mm.

3.2.

The markings referred to in paragraph 3.1. shall be clearly legible. They shall be raised above or sunk below the tyre surface or shall be permanently marked on the tyre surface.

3.3.

In the case of type of retreaded tyres produced by using pre-cured tread, the approval marking as shown in annex 2 to this Regulation shall be considered either as a label and put on a sticker of the pre-cured tread packaging or as a marking on the tread shoulder in order to ensure that the approval marking is affixed to the retreaded tyres approved pursuant this Regulation as required by paragraph 3.4.1. to UN Regulation No 108 or UN Regulation No 109.

3.3.1.

In the case of approval marking as shown in annex 2 to this Regulation is displayed on tread shoulder, the minimum height required for the dimension "a" is 8 mm and optionally, if the tread shoulder height is not sufficient, the circle surrounding the letter "E" followed by the distinguishing number of the country which has granted approval may be removed.

3.3.2.

The "Alpine" symbol (3-peak-mountain with snowflake) and the inscription M+S or MS or M.S. or M & S, if applicable, shall also be on the sticker unless already marked on the tread shoulder.

3.3.3.

The inscription "TRACTION", if applicable, shall be also on the sticker unless already marked on the tread shoulder.

3.4.

The approval mark prescribed in paragraph 5.4. of this Regulation shall be clearly legible. It shall be raised above or sunk below the tyre surface or shall be permanently marked on the tyre surface.

3.4.1.

Prior to approval tyres shall exhibit a free space sufficiently large to accommodate an approval mark as referred to in paragraph 5.4. and as shown in Annex 2 to this Regulation.

3.4.2

Following approval, the markings referred to in paragraph 5.4. and as shown in Annex 2 to this Regulation shall be affixed in the free space referred to in paragraph 3.4.1. This marking may be affixed to one sidewall only.

3.4.3.

In the case of type approval pursuant to this Regulation of a retreaded tyre produced by using a tread the supplier of which is the retreader himself granted by the same Type Approval Authority which granted to the retreading production unit the approval pursuant to Regulations Nos 108 or 109, the approval marks can be combined using sign “+” which indicates that the approval of the retreading production facility is complemented by an approval of the tyre type pursuant to this Regulation, as described in Annex 2, Appendix 3 of this Regulation.

4.   Application for approval

4.1.

The application for approval of a type of retreaded tyres shall be submitted by the supplier of the tread used for retreading process or by his duly accredited representative.

4.1.1.

The application referred to in paragraph 4.1. for approval of a type of retreaded tyres produced by using pre-cured tread of a certain pattern shall be drawn up in accordance with the model of the technical information document set out in Appendix 1 to Annex 1 of this Regulation.

4.1.2.

The application referred to in paragraph 4.1. for approval of a type of retreaded tyres produced by mould cure process shall be drawn up in accordance with the model of the technical information document set out in Appendix 2 to Annex 1 of this Regulation.

4.2.

The application for approval shall be accompanied by:

4.2.1.

Details of the major features of the tread pattern with respect to the effects on the snow grip performance of the range of tyre sizes listed as required by paragraph 2. of Appendix 1 or Appendix 2 to Annex 1 of this Regulation. This may be by means of descriptions supplemented by drawings and/or photographs which must be sufficient to allow the Type Approval Authority or Technical Service to determine whether any subsequent changes to the major features of the tread pattern will adversely affect the tyre performance. The effects of changes to minor details of the tread pattern on tyre performances will be evident and determined during checks on conformity of production;

4.3.

At the request of the Type Approval Authority, the applicant shall submit samples of tyres for the test or copies of test reports from the Technical Services, communicated as given in paragraph 12. of this Regulation.

4.4.

With regard to the application:

4.4.1.

in the case of retreaded tyre not covered by 4.4.2. testing may be confined to a representative tyre size of the type of retreaded tyre produced either by using a pre-cured tread or produced by mould cure process, whichever applicable, at the discretion of the Type Approval Authority.

4.4.1.1.

in the case of retreaded tyre produced by using a pre-cured tread or a mould cure process with a tread having the same major features including tread pattern, the supplier of the tread used for the retreading process may apply for an approval according to this Regulation covering a type of retreaded tyre produced by using both the mould cure process and the pre-cured tread.

4.4.2.

in the case of retreaded tyre produced by using either mould cure process or pre-cured tread with the same major features including tread pattern as a type of new tyre approved according to UN Regulation No 117 having fulfilled the requirements about minimum snow performance in severe snow conditions, the tyre manufacturer, as the supplier of the tread used for the retreading process, shall provide to the Type Approval Authority issuing the approval according to this Regulation a copy of the UN Regulation No 117 certificate(s).

5.   Approval

5.1.

If the representative tyre size of the type of retreaded tyre submitted for approval pursuant to this Regulation meets the requirements of paragraph 6. below, approval of that type of retreaded tyre, shall be granted.

5.2.

An approval number according to Schedule 4 to Revision 3 of the 1958 Agreement shall be assigned to the type of retreaded tyre. The same Contracting Party may not assign the same number to another type of retreaded tyre.

5.2.1.

In the case of retreaded tyre produced by using a tread the supplier of which is the retreader himself, instead of granting the original type approval number pursuant to this regulation, upon the request of the retreader, the Type Approval Authority may grant the type approval number, which had been granted before to the retreading production unit pursuant to UN Regulations Nos 108 or 109 with the subsequent extension number.

5.3.

Notice of approval or extension of approval or refusal of approval of a type of retreaded tyre pursuant to this Regulation shall be communicated to the Parties to the Agreement, which apply this Regulation by means of a form conforming to the model in Annex 1 to the Regulation.

5.3.1.

With reference to paragraph 5.2.1. above, retreaders are entitled to submit an application for extension of type approval to the requirements of UN Regulations Nos 108 or 109 relevant to the retreading production unit. In that case, a copy of the relevant type approval communication(s), as issued by the relevant Type Approval Authority, shall be attached to the application for extension of approval. Extensions of approval shall only be granted by the Type Approval Authority which issued the original approval for the retreading production unit.

5.3.1.1.

When extension of approval is granted to incorporate into the communication form (see Annex 1 to this Regulation) certificates(s) of conformity to UN Regulations Nos 108 or 109, the specific type approval number shall be added to item 9. of Annex 1 "Communication form".

5.4.

In the space referred to in paragraph 3.4.2. and in accordance with the requirements of paragraph 3.4. above there shall be affixed to every retreaded tyre conforming to the type approved under this regulation, an international approval mark consisting of:

5.4.1.

A circle surrounding the letter "E" followed by the distinguishing number of the country which has granted approval (5); and

5.4.2.

The part of the approval number specified in paragraph 3, Section 3 of Schedule 4 to the Revision 3 of the 1958 Agreement, which shall be placed close to the circle prescribed in paragraph 5.4.1. above either above or below the "E" or to the left or right of that letter.

5.4.3.

In the case of type of retreaded tyre produced by using a pre-cured tread in accordance with the requirements of paragraph 3.3. above there shall be either printed on a sticker equipping to every pre-cured tread package or marked on the tread shoulder the international approval mark described at paragraphs 5.4.1. and 5.4.2. which has to be affixed to every retreaded tyre as required in paragraph 5.4.

5.5.

If the retreaded tyre approved pursuant to this Regulation is produced in a retreading production unit which conforms to an approval under UN Regulations Nos 108 or 109 that has the retreaded tyre as part of the range of tyres approved in and by the country which has granted approval under this Regulation, it is not needed to repeat the symbol prescribed in paragraph 5.4.1. above. In such a case the additional numbers and symbols of UN Regulations Nos 108 or 109 under which approval has been granted in the country which has granted approval under this Regulation shall be placed adjacent to the symbol prescribed in paragraph 5.4.1. above, as described in Annex 2, Appendix 2 of this Regulation.

5.6.

Annex 2 to this Regulation gives examples of arrangements of approval marks.

6.   Specifications

6.1.

Snow performance of tyres retreaded either with a pre-cured tread or by using mould cure process, when tested according to Annex 7 to UN Regulation No 117 (6), The retreaded tyre shall meet the minimum snow grip index value compared with the respective Standard Reference Test Tyre (SRTT) as follows: Class of tyre Snow grip index (brake on snow method) (1) Snow grip index (spin traction method) (2) Snow grip index (acceleration method) (3)   Ref.s =, SRTT16 Ref. = SRTT16C Ref. = SRTT16 Ref.s = SRTT19.5, SRTT22.5, SRTT19.5 siped, SRTT22.5 siped C1 1.07 No 1.10 No C2 No 1.02 1.10 No C3 No No No 1.25

6.2.

In order to be classified as a "traction tyre", a tyre retreaded either with a pre-cured tread or by using mould cure process is required to meet the below reported conditions. The tyre shall have a tread pattern with minimum two circumferential ribs, each containing a minimum of 30 block-like elements, separated by grooves and/or sipe elements the depth of which has to be minimum of one half of the tread depth. The use of an alternative option of a physical test will only apply at a later stage following a further amendment to the Regulation including a reference to an appropriate test methods and limit values.

6.3.

In order to be classified as "special use tyre" a tyre shall have a block tread pattern in which the blocks (7) are larger and more widely spaced than for normal tyres and have the following characteristics: (a) For C1 tyres: (i) a tread depth ≥ 9 mm and (ii) a void to fill ratio ≥ 30 per cent; (b) For C2 tyres: (i) a tread depth ≥ 11 mm and (ii) a void to fill ratio ≥ 35 per cent; (c) For C3 tyres: (i) a tread depth ≥ 16 mm and (ii) a void to fill ratio ≥ 35 per cent.

6.4.

In order to be classified as a 'professional off-road tyre', a special use tyre shall fulfil the following additional requirement: (a) For class C2 tyres, the maximum speed category shall be less than or equal to 160 km/h (speed category symbol Q). (b) For class C3 tyres, the maximum speed category shall be less than or equal to 110 km/h (speed category symbol K).

7.   Modifications and extension of approval

7.1.

Every modification of the type of retreaded tyre which may influence the performance characteristics approved in accordance with this Regulation, shall be notified to the Type Approval Authority which approved the type of retreaded tyre. That Authority may either:

7.1.1.

Consider that the modifications are unlikely to have any appreciable adverse effect on the performance characteristics approved and that the retreaded tyre produced either by using a pre-cured tread or by using mould cure process will comply with the requirements of this Regulation; or

7.1.2.

Require further samples to be submitted for test or further test reports from the designated Technical Service.

7.2.

Confirmation or refusal of approval, specifying the modifications, shall be communicated by the procedure given in paragraph 5.3. of this Regulation to the Parties to the Agreement which apply this Regulation.

7.3.

The Type Approval Authority granting the extension of approval shall assign a series number for such an extension which shall be shown on the communication form.

8.   Conformity of production

The conformity of production procedures shall comply with those set out in the Agreement, Appendix 1 (E/ECE/324-E/ECE/TRANS/505/Rev.3), with the following requirements:

8.1.

Any retreaded tyre approved under this Regulation shall be so manufactured as to conform to the performance characteristics of the type approved and satisfy the requirements of paragraph 6. above;

8.2.

The holder of the approval shall ensure that, at least the following number of retreaded tyres, representative of the approved type range being produced, is checked and tested as prescribed in this Regulation:

8.2.1.

In the case of type approval granted to retreaded tyres not covered by 8.2.2., at least one tyre once every four years in order to verify conformity of the performance of the tyres for use in severe snow conditions fulfilling paragraph 6.1.

8.2.2.

In the case of type approval granted to a retreaded tyres produced by using a tread with the same major features including tread pattern(s) as a new tyre type approved according to UN Regulation No 117, the conformity to the requirement given in paragraph 6. can be confirmed through the compliance statement obtained in conformity of paragraph 8 of UN Regulation No 117 by the manufacturer of the new type of tyre.

8.3.

The authority which has granted type approval may at any time verify the conformity control methods applied by the supplier of the tread used for the retreading process. In general, the conformity control methods should take into consideration the production volumes of the type of the pre-cured tread or of the retreaded tyre produced by using the mould process at each manufacturing facility. The normal frequency of these verifications shall be at least once every two years.

8.4.

Verification tests shall be carried out on random samples of retreaded tyres bearing the approval mark required by this Regulation taken from the series production.

The Type Approval Authority shall satisfy itself that all retreaded tyres falling within an approved type comply with the approval requirement.

8.4.1.

In the case of verification tests with regard to approvals in accordance with paragraph 6. of this Regulation, these shall be carried out using the same testing method (see Annex 7 of UN Regulation No 117) as that adopted for original approval as declared in item 8 of the communication form.

8.5.

Production shall be deemed to conform to the requirements of this Regulation if the levels measured comply with the limits prescribed in paragraph 6. of this Regulation.

9.   Penalties for non-conformity of production

9.1.

The approval granted in respect of a type of retreaded tyre pursuant to this Regulation may be withdrawn if the requirements laid down in paragraph 8. above are not complied with.

9.2.

If a Party to the Agreement, which applies this Regulation, withdraws an approval, it has previously granted, it shall forthwith notify the other Contracting Parties applying this Regulation by means of a copy of the approval form conforming to the model in Annex 1 to this Regulation.

10.   Production definitively discontinued

If the holder of an approval completely ceases to manufacture a type of retreaded tyre approved in accordance with this Regulation, they shall so inform the Type Approval Authority, which granted the approval. Upon receiving the relevant communication that Authority shall inform thereof the other Parties to the 1958 Agreement applying this Regulation by means of a communication form conforming to the model in Annex 1 to this Regulation.

11.   Names and addresses of technical services responsible for conducting approval tests, of test laboratories, and of Type Approval Authorities.

11.1.

The Contracting Parties to the 1958 Agreement which apply this Regulation shall communicate to the United Nations Secretariat the names and addresses of the Technical Services responsible for conducting approval tests and, where applicable, of the approved test laboratories and of Type Approval Authorities which grant approval and to which forms certifying approval or extension of approval or refusal of approval or withdrawal of approval or production definitely discontinued, issued in other countries, are to be sent.

11.2.

The Contracting Parties to the 1958 Agreement which apply this Regulation may designate laboratories of supplier of the tread used for the retreading process as approved test laboratories.

11.3.

Where a Contracting Party to the 1958 Agreement applies paragraph 11.2. above, it may, if it so desires, be represented at the tests by one or more persons of its choice.

12.   Transitional provisions

12.1.

As from 1 September 2030, Contracting Parties applying this Regulation shall not grant type approvals based on snow performance tests as described in Annex 7 to UN Regulation No 117 using one of the two equivalent Standard Reference Test Tyres SRTT19.5 and SRTT22.5 as reference tyre.

12.2.

As from 1 September 2030, Contracting Parties applying this Regulation shall not be obliged to accept type approvals, first issued after 31 August 2030, based on snow performance tests as described in Annex 7 to UN Regulation No 117 using one of the two equivalent Standard Reference Test Tyres SRTT19.5 and SRTT22.5 as reference tyre.

12.3.

Notwithstanding paragraph 12.1, Contracting Parties applying this Regulation shall continue to grant extensions to existing type approvals of class C3 tyres according to this Regulation first granted before 1 September 2030, based on snow performance test described in Annex 7 to UN Regulation No 117 using either SRTT19.5 or SRTT22.5 as reference tyre. In case a new test has to be performed on a different representative tyre size for an extension to be granted after 1 September 2030, the SRTT19.5 siped and SRTT22.5 siped shall be used.

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(1)  For the purpose of this Regulation “tyres” means “pneumatic tyres”.

(2)  Retreaded tyres are refurbished tyres after retreading process.

(3)  As defined in the Consolidated Resolution on the Construction of Vehicles (R.E.3).

(4)  In this Regulation the type approval under UN Regulation No. 117 may be used as a reference for assessing the performance for the case of tread pattern as described in 8.2.2.

(5)  The distinguishing numbers of the Contracting Parties to the 1958 Agreement are reproduced in Annex 3 to the Consolidated Resolution on the Construction of Vehicles (R.E.3).

(6)  If a tread pattern can be applied by mould cure and pre-cure retread processes, the snow test may be performed with a representative tyre size retreaded with only one of the two possible processes and the snow performance test report can be used for both cases as long as the major features of the tread are technically identical.

(1)  See paragraph 3 of Annex 7 to UN Regulation No 117.

(2)  See paragraph 2 of Annex 7 to UN Regulation No 117.

(3)  See paragraph 4 of Annex 7 to UN Regulation No 117.

(7)  Blocks may be shaped as lugs and cleats.