Regulation UN No. 30 (Rev.3)

Tyres for passenger cars and their trailers

Consolidated up to

Suppl. 24 to 02

dated: 07.01.22

Status table
... Regulation a0c0
... 1. Scope a0c0
... 2. Definitions a0c0
... 3. Markings a0c0
... 4. Application for approval a0c0
... 5. Approval a0c0
... 6. Requirements a0c0
... 7. Modifications of the type of pneumatic tyre and extension of approval a0c0
... 8. Conformity of production a0c0
... 9. Penalties for non-conformity of production a0c0
... 10. Production definitively discontinued a0c0
... 11. Transitional provisions a0c0
... 12. Names and addresses of Technical Services responsible for conducting approval tests and of Administrative Departments a0c0
... Annexes a0c0
... 1. Communication concerning the approval or extension or refusal or withdrawal of approval or production definitely discontinued of a type of pneumatic tyre for motor vehicles pursuant to Regulation No. 30 a0c0
... 2. Example of the arrangement of the approval mark a0c0
... 3. Arrangement of tyre markings a0c0
... 4. Load-capacity indices a0c0
... 5. Tyre size designation and dimensions a0c0
... 6. Method of measuring pneumatic tyres a0c0
... 7. Procedure for load/speed performance tests a0c0
1. SCOPE a0c0
... This Regulation applies: a0c0
... This Regulation covers new pneumatic tyres[*] designed primarily for vehicles of categories M1, N1, O1 and O2. [1] [**] a4c0
[DEL][1] As defined in Annex 7 to the Consolidated Resolution on the Construction of Vehicles (R.E.3), (document TRANS/WP.29/78/Rev.1/Amend.2 as last amended by Amend.4). a4c0
[*] For the purpose of this regulation "tyres" means "pneumatic tyres" a4c0
[**] This Regulation defines requirements for tyres as a component. It does not limit their installation on any categories of vehicles. a2c0
... It does not apply to tyres designed for a0c0
1.1 [DEL]the equipment for vintage cars a4c0
1.2 [DEL]competitions. a4c0
2. DEFINITIONS a0c0
... For the purposes of this Regulation, a0c0
2.1. "Type of tyre" means tyres which do not differ in such essential characteristics as: a4c0
[DEL]

(a)The manufacturer's name;

 a4c0
[DEL] (b) Tyre-size designation; a4c0
[DEL] (c) Category of use ([DEL] normal tyre, snow tyre, special use tyre or temporary use tyre); a4c0
[DEL] (d) Structure (diagonal (bias-ply), bias-belted, radial (radial-ply), run flat tyre); a7c0
[DEL] (e) Speed category symbol; a4c0
[DEL] (f) Load-capacity index; a4c0
[DEL] (g) Tyre cross-section; a4c0
2.2. "Manufacturer" means the person or body who is responsible to the Type Approval Authority (TAA) for all aspects of the type-approval and for ensuring the conformity of production. a4c0
2.3. "Brand name/trademark" means the identification of the brand or trademark as defined by the tyre manufacturer and marked on the sidewall(s) of the tyre. The brand name/trademark may be the same as that of the manufacturer. a4c0
2.4. "Trade description/commercial name" means an identification of a range of tyres as given by the tyre manufacturer. It may coincide with the brand name/trademark. a4c0
2.5. "Normal tyre" means a tyre intended for normal on-road use. a4c0
2.6. "Snow tyre" means a tyre whose tread pattern, tread compound or structure is primarily designed to achieve in snow conditions a performance better than that of a normal tyre with regard to its ability to initiate or maintain vehicle motion. a4c0
2.7. "Special use tyre" means 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. a4c0
2.7.1 "Professional off-road tyre" is a special use tyre primarily used for service in severe off-road conditions. a4c0
2.8. "Temporary use spare tyre" means a tyre different from a tyre intended to be fitted to any vehicle for normal driving conditions but intended only for temporary use under restricted driving conditions; a7c0
2.8.1. "T-type temporary use spare tyre" means a type of temporary use spare tyre designed for use at inflation pressures higher than those established for standard and reinforced tyres; a7c0
2.9. "Structure" of a pneumatic tyre means the technical characteristics of the tyre's carcass. The following structures are distinguished in particular; a7c0
2.9.1.

"Diagonal" or "bias-ply" describes a tyre structure in which the ply cords extend to the beads and are laid at alternate angles of substantially less than 90° to the centre line of the tread;

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2.9.2.

"Bias-belted" describes a tyre structure [DEL] in which the 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 being restricted by a belt comprising one or more layers of substantially inextensible cord material;

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2.9.3.

"Radial" or "radial-ply" describes tyre structure in which the ply cords extend to the beads and are laid substantially at 90° to the centre line of the tread, the carcass being stabilized by an essentially inextensible circumferential belt;

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2.9.4. "Run flat tyre" or "Self supporting tyre" describes a [DEL]tyre structure provided with any technical solutions (for example, reinforced sidewalls, etc.) allowing the [DEL]tyre, mounted on the appropriate wheel and in the absence of any supplementary component, to supply the vehicle with the basic tyre functions, at least, at a speed of 80 km/h [DEL]and a distance of 80 km when operating in flat tyre running mode. a7c0
2.10. "Reinforced" or "Extra Load"means a tyre [DEL] designed to carry more load at a higher inflation pressure than the load carried by the corresponding standard version tyre at the standard inflation pressure as specified in ISO 4000-1:2010; a7c0
2.11. "Extended Mobility Tyre (EMT)" describes a tyre with a radial structure allowing the tyre, mounted on the appropriate wheel and in the absence of any supplementary component, to provide the vehicle with the basic tyre functions at a speed of 80 km/h and a distance of 80 km when operating in flat tyre running mode. a7c0
2.12. "Bead" means the part of a tyre which is of such shape and structure as to fit the rim and hold the tyre on it; [1] a7c0
2.13. "Cord" means the strands forming the fabric of the plies in the tyre; [2] a7c0
2.14. "Ply" means a layer of rubber-coated parallel cords; [2] a7c0
2.15. "Carcass" means that part of a tyre other than the tread and the rubber side walls which, when inflated, bears the load; [2] a7c0
2.16. "Tread" means that part of a tyre which comes into contact with the ground; [2] a7c0
2.17. "Side wall" means the part of a tyre between the tread and the bead; [2] a7c0
2.18. "Lower area of tyre" means the area included between the point of maximum section width of the tyre and the area designed to be covered by the edge of the rim; [2] a7c0
2.18.1. However, in case of tyres identified by the "tyre to rim fitment configuration" (see para. 3.1.10.) symbol "A" or "U", it means the area of the tyre which is seating on the rim. a7c0
2.19. "Tread pattern groove" means the space between two adjacent ribs or blocks in the tread pattern [2]; a7c0
2.20. "Section width" means the linear distance between the outsides of the side walls of an inflated tyre, excluding elevations due to labelling (marking), decoration or protective bands or ribs; [2] a7c0
2.21. "Overall width" means the linear distance between the outsides of the side walls of an inflated tyre, including labelling (marking), decoration and protective bands or ribs; [2] a7c0
2.22. "Section height" means a distance equal to half the difference between the outer diameter of the tyre and the nominal rim diameter; [2] a7c0
2.23. "Nominal aspect ratio (Ra)" means the centuple of the number obtained by dividing the number expressing the section height in mm by the number expressing the nominal section width in mm; a7c0
2.24. "Outer diameter" means the overall diameter of an inflated new tyre; [2] a7c0
[2] See explanatory figure. a0c0
2.25. "Tyre-size designation" is a designation showing:" a7c0
[DEL] [DEL] a7c0
2.25.1. the nominal section width. This width must be expressed in mm, except in the case of the types of tyre for which the size designation is shown in the first column of the tables in Annex 5 to this Regulation; a7c0
2.25.2. the nominal aspect ratio except in the case of certain types of tyre, for which the size designation is shown in the first column of the tables in Annex 5 to this Regulation, or, depending on the tyre design type, the nominal outer diameter expressed in mm; a7c0
2.25.3. An indication of the structure as follows: a7c0
2.25.3.1. On diagonal (bias-ply) tyres, no marking or the letter "D" placed in front of the rim diameter marking; a7c0
2.25.3.2. On radial-ply tyres, the letter "R" placed in front of the rim diameter marking, and, optionally, the word "RADIAL"; a7c0
2.25.3.3. On bias-belted tyres, the letter "B" placed in front of the rim diameter marking, and in addition the words "BIAS-BELTED"; a7c0
2.25.3.4. On radial ply tyres suitable for speeds in excess of 240 km/h but not exceeding 300 km/h (tyres marked with the speed symbol "W" or "Y" as part of the service description), the letter "R", placed before the rim diameter marking, may be replaced with the inscription "ZR"; on tyres suitable for speeds in excess of 300 km/h, the letter "R" placed in front of the rim diameter marking shall be replaced by the inscription "ZR"; a7c0
2.25.3.5. On "run flat" or "self supporting" tyres the letter "F" placed in front of the rim diameter marking." a7c0
2.25.4. a conventional number denoting the nominal rim diameter and corresponding to its diameter expressed either by codes (numbers below 100) or in millimetres (numbers above 100); a7c0
2.25.5. the letter "T" in front of the nominal section width in case of T-type temporary use spare tyres; a7c0
2.25.6. Optionally the letter "P" in front of the nominal section width; a7c0
2.25.7. an indication of the tyre to rim fitment configuration when it differs from the standard configuration. a7c0
2.26. "Nominal rim diameter" means the diameter of the rim on which a tyre is designed to be mounted; a7c0
2.26.1 The values of the nominal rim diameters for code-designated rims expressed in millimetres are shown below: a7c0
... a4c0
2.27. "Rim" means the support for a tyre-and-tube assembly, or for a tubeless tyre, on which the tyre beads are seated; 2/ a7c0
[2] See explanatory figure. a0c0
2.27.1. "Tyre to rim fitment configuration" means the type of rim to which the tyre is designed to be fitted. In the case of non-standard rims this will be identified by a symbol applied to the tyre, for example, "CT", "TR", "TD", "A" or "U". a7c0
2.28. "Theoretical rim" means the notional rim whose width would be equal to x times the nominal section width of a tyre. The value of x shall be specified by the manufacturer of that tyre; a7c0
2.29. "Measuring rim" means the rim on which a tyre is required to be fitted for size measurements; a7c0
2.30. "Test rim" means the rim on which a tyre is required to be fitted for testing; a7c0
2.31. "Chunking" means the breaking away of pieces of rubber from the tread; a7c0
2.32. "Cord separation" means the parting of the cords from their rubber coating; a7c0
2.33. "Ply separation" means the parting of adjacent plies; a7c0
2.34. "Tread separation" means the pulling away of the tread from the carcass; a7c0
2.35. "Tread-wear indicators" means the projections within the tread grooves designed to give a visual indication of the degree of wear of the tread; a7c0
2.36. "Load-capacity index" means a number associated to the reference mass a tyre can carry when operated in conformity with requirements governing utilization specified by the manufacturer. a7c0
2.37. "Speed category" means the maximum speed which the tyre can sustain, expressed by speed category symbol (see table below). a7c0
2.37.1. The categories of speed are those indicated in the table below: a7c0
... a0c0
2.38. Tread pattern grooves a7c0
2.38.1. "Principal grooves" means the wide circumferential grooves positioned in the central zone of the tyre tread, which have the tread-wear indicators located in the base. a7c0
2.38.2. "Secondary grooves" means the supplementary grooves of the tread pattern which may disappear in the course of the tyre's life. a7c0
2.39. "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. a7c0
2.40. "Maximum load rating" means the maximum mass the tyre is rated to carry; a7c0
2.40.1. for speed not exceeding 210 km/h the maximum load rating shall not exceed the value associated with the load capacity index of the tyre; a7c0
2.40.2. for speed higher than 210 km/h, but not exceeding 240 km/h, (tyres classified with speed category symbol "V") the maximum load rating shall not exceed the percentage of the value associated with the load capacity index of the tyre, indicated in the table below, with reference to the speed capability of the car to which the tyre is fitted. a7c0
... a0c0
... For intermediate maximum speeds linear interpolations of the maximum load rating are allowed. a0c0
2.40.3 For speeds higher than 240 km/h (tyres classified with speed category symbol "W") the maximum load rating shall not exceed the percentage of the value associated with the load capacity index of the tyre, indicated in the table below, with reference to the .speed capability of the car to which the tyre is fitted. a7c0
... a0c0
... For intermediate maximum speeds linear interpolations of the maximum load rating are allowed. a0c0
2.40.4. For speeds higher than 270 km/h (tyres classified with speed-category symbol "Y") the maximum load rating shall not exceed the percentage of the value associated with the load capacity index of the tyre, indicated in the table below, with reference to the speed capability of the car to which the tyre is fitted. a7c0
... a0c0
... For intermediate maximum speeds linear interpolations of the maximum load rating are allowed. a0c0
2.40.5. For speeds lower or equal to 60 km/h the maximum load rating must not exceed the percentage of mass, associated with the load capacity index of the tyre indicated in the table below with reference to the maximum design speed of the vehicle to which the tyre is to be fitted. a7c0
... a0c0
2.40.6. For speeds in excess of 300 km/h, the maximum load rating must not exceed the mass specified by the tyre manufacturer with reference to the speed capacity of the tyre. For intermediate speeds between 300 km/h and the maximum speed permitted by the tyre manufacturer, a linear interpolation of the maximum load rating applies. a7c0
2.41. "Flat tyre running mode" describes the state of the tyre, essentially maintaining its structural integrity, while operating at an inflation pressure between 0 and 70 kPa. a7c0
2.42. "Basic tyre functions" means the normal capability of an inflated tyre in supporting a given load up to a given speed and transmitting the driving, the steering and the braking forces to the ground on which it runs. a7c0
[DEL] [DEL] a7c0
2.43. "Deflected section height" is the difference between the deflected radius, measured from the centre of the rim to the surface of the drum, and one half the nominal rim diameter as defined in ISO 4000-1. a7c0
3. MARKINGS a0c0
3.1. [DEL] tyres submitted for approval shall bear on both side walls in the case of symmetrical tyres and at least on the outer side wall in the case of asymmetrical tyres: a4c0
3.1.1. The manufacturer's name or the Brand name/trademark; a4c0
3.1.2. The trade description/commercial name (see paragraph 2.4. of this Regulation). However, the trade description is not required when it coincides with the Brand name/trademark. a4c0
3.1.3. The tyre-size designation a4c0
[DEL] [DEL] a7c0
[DEL] [DEL] a7c0
[DEL] [DEL] a7c0
[DEL] [DEL] a7c0
[DEL] [DEL] a7c0
[DEL] [DEL] a7c0
3.1.4. The load-capacity index; a7c0
3.1.5. An indication of the tyre's speed category symbol a4c0
3.1.5.1. On tyres suitable for speeds in excess of 300 km/h, in addition to what is already defined in 2.24.3.4. the tyre shall be marked with a service description consisting of the speed symbol "Y" and the corresponding load index. The service description shall be marked within brackets, for example, "(95Y)". a7c0
3.1.6. The inscription M+S or M.S or M&S if the tyre is classified in the category of use "snow tyre" or if the tyre is classified in the category of use "special use tyre" when declared by the tyre manufacturer at paragraph 4.1.3. as complying also with the definition given in paragraph 2.6. a5c0
3.1.7. The inscription "ET" and/or "POR" if the tyre is classified in the category of use "Special use". In addition, they may also bear the inscription M+S or M.S or M&S.
ET means Extra Tread and POR means Professional Off Road. 		a5c0
3.1.8. The word "TUBELESS" if the tyre is designed for use without an inner tube; a7c0
3.1.9. The word "REINFORCED" or the words "EXTRA LOAD" if the tyre is a reinforced tyre; a7c0
3.1.10. The date of manufacture in the form of a group of four digits, the first two showing the week and the last two the year of manufacture. However, this marking which may be placed on one side wall only, shall not be mandatory, on any tyre submitted for approval, until two years after the date of entry into force of this Regulation. [3] a7c0
[3] Before 1 January 2000, the date of manufacture may be indicated by a group of three digits, the first two showing the week and the last one the year of manufacture. a0c0
3.1.11. In the case of tyres first approved after the entry into force of Supplement 13 to the 02 series of amendments to UN Regulation No. 30, the identification referred to in paragraph 2.25.7. shall be placed immediately after the rim diameter marking referred to in paragraph 2.25.4. a7c0
3.1.12. In the case of temporary use spare tyres, the words "TEMPORARY USE ONLY" in upper case characters at least 12.7 mm high. a7c0
3.1.12.1. In addition, in the case of "T" type temporary use spare tyres, the legend "INFLATE TO 420 kPa (60 psi)", the upper case characters being at least 12.7 mm high. a7c0
3.1.13. The symbol below if the tyre is a "run flat" or "self supporting" tyre, where "h" is at least 12 mm. a7c0
... a0c0
3.1.14.

The symbol below if the tyre is an EMT, where "h" is at least 12 mm.

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...

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3.2. Tyres shall provide adequate space for the approval mark, as shown in Annex 2 to this Regulation. a0c0
3.3. Annex 3 to this Regulation gives an example of the arrangement of the tyre markings. a0c0
3.4.

The markings referred to in paragraph 3.1. and the approval mark prescribed in paragraph 5.4. of this Regulation [DEL] shall be clearly legible and raised above or sunk below the tyre surface. [DEL]

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3.4.1.

The markings shall be situated in the lower area of the tyre on at least one of its sidewalls, except for the inscriptions mentioned in paragraphs 3.1.1., 3.1.2. and 3.1.12.
However, for tyres identified by the "tyre to rim fitment configuration" (see para. 2.27.1.), symbol "A" or "U", the markings may be placed anywhere on the outside sidewall of the tyre.

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3.4.2.

In the case that the date of manufacture is not moulded, it shall be applied not later than 24 hours after the tyre is removed from the mould.

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4. APPLICATION FOR APPROVAL a0c0
4.1. The application for approval of a type of [DEL] tyre with regard to this regulation shall be submitted by the tyre manufacturer or by his duly accredited representative. It shall specify: a4c0
4.1.1. The tyre-size designation; [DEL] a3c0
4.1.2.

The manufacturer's name;

 a4c0
4.1.2.1 The Brand name(s)/trademark(s); a4c0
4.1.2.2 The trade description(s)/commercial name(s) a4c0
4.1.3. The category of use normal tyre or snow tyre, or special use tyre, or for temporary use); a3c0
4.1.3.1 For the tyres belonging to the category of use "special use tyre" those which may bear the inscription M+S or M.S or M&S. a5c0
4.1.4. Structure: diagonal (bias ply), bias belted, radial, run flat tyre; a0c0
4.1.5. The speed category; a0c0
4.1.6. The load-capacity index of the tyre; a0c0
4.1.7. Whether the tyre is to be used with or without an inner tube; a0c0
4.1.8. Whether the tyre is "standard" or "reinforced" or "T-type temporary use spare tyre"; a0c0
4.1.9. Whether the tyre is an EMT; a7c0
4.1.10.

The ply-rating number of diagonal (bias-ply) tyres, except for T-type temporary use spare tyres;

 a8c0
4.1.11. The overall dimensions: overall section width and outer diameter; a7c0
4.1.12. The rims on which the tyre can be mounted; a7c0
4.1.13. The measuring rim and test rim; a7c0
4.1.14. The test pressure where the manufacturer requests the application of Annex 7, paragraph 1.3. to this Regulation; a7c0
4.1.15. The factor x referred to in paragraph 2.28. above. a7c0
4.1.16. For tyres suitable for speeds in excess of 300 km/h, the maximum speed permitted by the tyre manufacturer and the load carrying capacity allowed for that maximum speed. The tyre manufacturer must also specify these values in the technical literature for the tyre type. a7c0
4.1.17. The identification of the bead retention rim contours specific for the "flat tyre running mode" of "run flat tyres". a7c0
4.2. The application for approval shall be accompanied (all in triplicate) by a sketch, or a representative photograph, which identify the tyre tread pattern and a sketch of the envelope of the inflated tyre mounted on the measuring rim, showing the relevant dimensions (see paragraphs 6.1.1. and 6.1.2.) of the type submitted for approval. It shall also be accompanied either by the test report issued by the approved Test Laboratory or by one or two samples of the tyre type, at the discretion of the Competent Authority. Drawings or photographs of the side wall and tread of the tyre shall be submitted once production has been established, no later than one year after the date of issue of the type approval. a0c0
4.3. The Competent Authority shall verify the existence of satisfactory arrangements for ensuring effective control of the conformity of production before type approval is granted. a0c0
4.4. Where a tyre manufacturer submits application for type approval for a range of tyres, it is not considered necessary to carry out a load/speed test on every type of tyre in the range. Worst case selection may be made at the discretion of the Approval Authority. a0c0
5. APPROVAL a0c0
5.1. If the[DEL] tyre submitted for approval in pursuance of this Regulation meets the requirements of paragraph 6 below, approval of that type of tyre shall be granted. a4c0
5.2. An approval number shall be assigned to each type approved. Its first two digits (at present 02) shall indicate the series of amendments incorporating the most recent major technical amendments made to the Regulation at the time of issue of the approval. The same Contracting Party shall not assign the same number to another tyre type covered by this Regulation. a0c0
5.3. Notice of approval or of extension or refusal or withdrawal of approval or production definitively discontinued of a type of [DEL]tyre pursuant to this Regulation shall be communicated to the Parties to the 1958 Agreement applying this Regulation, by means of a form conforming to the model in Annex 1 to this Regulation. a4c0
5.3.1. Where type approval is granted for a tyre type suitable for speeds over 300 km/h (see paragraph 4.1.15.), the relevant maximum speed (km/h) and the load carrying capacity (kg) allowed for the maximum speed shall be notified in clear in section 10 of the communication form (see Annex 1 of this Regulation); load carrying capacities for intermediate speeds higher than 300 km/h may also be specified. a0c0
5.4. There shall be affixed conspicuously to every [DEL] tyre conforming to a type of tyre approved under this Regulation, in the space referred to in paragraph 3.2. above and in addition to the markings prescribed in paragraph 3.1. above, an international approval mark consisting of: a4c0
5.4.1. A circle surrounding the letter "E" followed by the distinguishing number of the country which has granted approval; [4] a0c0
[4] 1 for Germany, 2 for France, 3 for Italy, 4 for the Netherlands, 5 for Sweden, 6 for Belgium, 7 for Hungary, 8 for the Czech Republic, 9 for Spain, 10 for Serbia, 11 for the United Kingdom, 12 for Austria, 13 for Luxembourg, 14 for Switzerland, 15 (vacant), 16 for Norway, 17 for Finland, 18 for Denmark, 19 for Romania, 20 for Poland, 21 for Portugal, 22 for the Russian Federation, 23 for Greece, 24 for Ireland, 25 for Croatia, 26 for Slovenia, 27 for Slovakia, 28 for Belarus, 29 for Estonia, 30 (vacant), 31 for Bosnia and Herzegovina, 32 for Latvia, 33 (vacant), 34 for Bulgaria, 35 (vacant), 36 for Lithuania, 37 for Turkey, 38 (vacant), 39 for Azerbaijan, 40 for The former Yugoslav Republic of Macedonia, 41 (vacant), 42 for the European Community (Approvals are granted by its Member States using their respective ECE symbol), 43 for Japan, 44 (vacant), 45 for Australia, 46 for Ukraine, 47 for South Africa, 48 for New Zealand, 49 for Cyprus, 50 for Malta, 51 for the Republic of Korea, 52 for Malaysia, 53 for Thailand, 54 and 55 (vacant) and 56 for Montenegro. Subsequent numbers shall be assigned to other countries in the chronological order in which they ratify or accede to the Agreement Concerning the Adoption of Uniform Technical Prescriptions for Wheeled Vehicles, Equipment and Parts which can be Fitted and/or be Used on Wheeled Vehicles and the Conditions for Reciprocal Recognition of Approvals Granted on the Basis of these Prescriptions, and the numbers thus assigned shall be communicated by the Secretary-General of the United Nations to the Contracting Parties to the Agreement. a0c0
5.4.2. An approval number. a0c0
5.5. The approval mark shall be clearly legible and be indelible. a0c0
5.6. Annex 2 to this Regulation gives an example of the arrangement of the approval mark. a0c0
6. REQUIREMENTS a0c0
6.1. Dimensions of tyres a0c0
6.1.1. Section width of a tyre a0c0
6.1.1.1. The section width shall be calculated by the following formula: a0c0
... S = S1 + K(A-A1), a0c0
... where: a0c0
... S is the "section width" rounded to the nearest millimetre and measured on the measuring rim; a4c0
... S1 is the "nominal section width" (in mm) as shown on the side wall of the tyre in the designation of the tyre as prescribed; a0c0
... A is the width (expressed in mm) of the measuring rim, as shown by the manufacturer in the descriptive note; [5] a0c0
[5] When the conventional number is given by codes, the value in mm is obtained by multiplying such number by 25.4. a0c0
... A1 is the width (expressed in mm) of the theoretical rim. a0c0
... A1 shall be taken to equal S1 multiplied by the factor x, as specified by the manufacturer, and K shall be taken to equal 0.4. a0c0
6.1.1.2. However, for the types of tyres for which the designation is given in the first column of the tables in Annex 5 to this Regulation, the section width shall be that given opposite the tyre designation in these tables. a0c0
6.1.1.3. However, for tyres identified by the "tyre to rim fitment configuration" (see para. 2.27.1.) symbol "A" or "U", K shall be taken equal to 0.6. a7c0
6.1.2. Outer diameter of a tyre a0c0
6.1.2.1. The outer diameter of a tyre shall be obtained by means of the following formula: a4c0
... D = d + 2H a0c0
... where: a0c0
... D is the outer diameter expressed in millimetres; a4c0
... d is the nominal rim diameter defined in paragraph 2.26. above, expressed in millimetres; a7c0
... H is the nominal section height rounded to the nearest millimetre and is equal to: a4c0
... H = 0.01 ⋅ S1 ⋅ Ra, where a0c0
... S1 is the nominal section width in millimetres (mm); a4c0
... Ra is the nominal aspect ratio, a0c0
... all as shown on the side wall of the tyre in the tyre-size designation in conformity with the requirements of paragraph 3.4. above. a0c0
6.1.2.2. However, for the types of tyres for which the designation is given in the first column of the tables of Annex 5 to this Regulation the outer diameter shall be that given opposite the "size" designation in these tables. a0c0
6.1.2.3. However, for tyres identified by the "tyre to rim fitment configuration" (see para. 2.27.1.) symbol "A" or "U", the outer diameter shall be that specified in the tyre size designation as shown on the sidewall of the tyre. a7c0
6.1.3. Method of measuring [DEL]tyres a4c0
... The dimensions of pneumatic tyres shall be measured by the procedure described in Annex 6 to this Regulation. a0c0
6.1.4. Tyre section width specifications a0c0
6.1.4.1. The overall width of a tyre may be less than the section width determined pursuant to paragraph 6.1.1. above. a0c0
6.1.4.2. It may exceed that value by the following percentages, whereby the limits shall be rounded to the nearest mm: a4c0
6.1.4.2.1.

In diagonal (bias-ply) and bias-belted tyres: 6 per cent;

 a8c0
6.1.4.2.2. in radial ply, run flat tyres: 4 per cent; a0c0
6.1.4.2.3. in addition, if the tyre has special protective ribs (or bands), the figure as increased by the above tolerance may be exceeded by 8 mm. a0c0
6.1.4.2.4. However, for tyres identified by the "tyre to rim fitment configuration" (see para. 2.27.1) symbol "A" or "U", the overall width of the tyre, in the lower area of the tyre, equals the nominal width of the rim on which the tyre is mounted, as shown by the manufacturer in the descriptive note, increased by 20 mm. a7c0
6.1.5. Tyre outer-diameter specifications a0c0
... The outer-diameter of a tyre must not be outside the values Dmin and Dmax obtained from the following formulae: a0c0
... Dmin = d + (2H ⋅ a) a0c0
... Dmax = d + (2H ⋅ b) a0c0
... where: a0c0
... Hmin = H ⋅ a rounded to the nearest mm a4c0
... Hmax = H ⋅ b rounded to the nearest mm a4c0
... and a4c0
6.1.5.1. for sizes listed in Annex 5, and for tyres identified by the "tyre to rim fitment configuration" (see para. 2.27.1.) symbol "A" or "U", the nominal section height H is equal to: a7c0
...

H = 0.5 (D-d), rounded to the nearest mm - for references see paragraph 6.1.2.1.

 a4c0
6.1.5.2. for other sizes, not listed in Annex 5, "H" and "d" are as defined in paragraph 6.1.2.1, a0c0
6.1.5.3. Coefficients "a" and "b" are respectively: a0c0
6.1.5.3.1. Coefficient "a" = 0.97 a0c0
6.1.5.3.2.

a4c0
6.1.5.4.

For tyres of the category of use "snow tyre"

the outer diameter shall not exceed the following value
Dmax,snow = 1.01 • Dmax rounded to the nearest mm
where Dmax is the maximum outer diameter established in conformity with the above.

 a5c0
6.2. Load/speed performance test a0c0
6.2.1. The [DEL] tyre shall undergo a load/speed performance test carried out by the procedure described in Annex 7 to this Regulation. a4c0
6.2.1.1. Where application is made for tyres identified by means of letter code "ZR" within the size designation and suitable for speeds over 300 km/h (see paragraph 4.1.16.), the above load/speed test is carried out on one tyre at conditions appropriate for the load index marked on the tyre and the speed symbol "Y". Another load/speed test must be carried out on a second sample of the same tyre type according to paragraph 2.6. of Annex 7 corresponding to the load and speed conditions specified as maximum by the tyre manufacturer (see paragraph 4.1.16. of this Regulation).
The second test may be carried out on the same tyre sample if the tyre manufacturer agrees." 		a7c0
6.2.1.2. Where application is made for the type approval of a "run flat tyre" the above load speed test is carried out on one tyre, inflated as per paragraph 1.2. of Annex 7, at the load and speed conditions marked on the tyre (see paragraphs 3.1.5. and 3.1.8.). Another load/speed test must be carried out on a second sample of the same tyre type as specified in paragraph 3. of Annex 7. The second test may be carried out on the same sample if the manufacturer agrees. a7c0
6.2.1.3. Where application is made for the type approval of an EMT the above load speed test is carried out on one tyre, inflated as per paragraph 1.2. of Annex 7, at the load and speed conditions marked on the tyre (see paragraphs 3.1.5. and 3.1.8.). Another load/speed test must be carried out on a second sample of the same tyre type as specified in paragraph 4. of Annex 7. The second test may be carried out on the same sample if the manufacturer agrees. a7c0
6.2.2. A tyre which after undergoing the load/speed test as specified in paragraph 2. of Annex 7 does not exhibit any tread separation, ply separation, cord separation, chunking or broken cords shall be deemed to have passed the test. a3c0
6.2.2.1. However, a tyre marked with the speed symbol "Y" which, after undergoing the relevant test, exhibits superficial blistering of the tyre tread caused by the specific test equipment and conditions, is deemed to have passed the test. a0c0
6.2.2.2. If a "run flat [DEL]tyre" which, after undergoing the test as specified in paragraph 3. of Annex 7, does not exhibit a change in the deflected section height, compared to the deflected section height at the start of the test, higher than 20 per cent and retains the tread connected to the two sidewalls, it is deemed to have passed the test. a7c0
6.2.2.3. If an EMT which, after undergoing the test as specified in paragraph 4. of Annex 7, does not exhibit a change in the deflected section height, compared to the deflected section height at the start of the test, higher than 20 per cent and retains the tread connected to the two sidewalls, it is deemed to have passed the test. a7c0
6.2.3.

Except for tyres with radial structure or run flat tyres, the outer diameter of the tyre, measured six hours after the load/speed performance test as specified in paragraph 2. of Annex 7, must not differ by more than ±3.5 per cent from the outer diameter as measured before the test.

 a8c0
6.3. Tread-wear indicators a3c0
6.3.1 In order to be classified as a "special use tyre" a tyre shall have a block tread pattern in which the blocks are larger and more widely spaced than for normal tyres and have the following characteristics:
(a) A tread depth ≥ 11 mm
(b) A void-to-fill ratio ≥ 35 per cent 		a3c0
6.3.2 In order to be classified as a "professional off-road tyre", a tyre shall have all of the following characteristics:
(a) A tread depth ≥ 11 mm;
(b) A void-to-fill ratio ≥ 35 per cent;
(c) A maximum speed rating of ≤ Q. 		a3c0
6.3.3. Tread pattern of a tyre a3c0
6.3.3.1. The [DEL] tyre shall include not less than six transverse rows of wear indicators, approximately equally spaced and situated in the principal grooves of the tread. The tread-wear indicators shall be such that they cannot be confused with the rubber ridges between the ribs or blocks of the tread. a4c0
6.3.3.2. However, in the case of tyres of dimensions appropriate for mounting on rims of a nominal diameter of 12 or less, four rows of tread-wear indicators shall be accepted. a3c0
6.3.3.3. The tread-wear indicators must provide a means of indicating, with a tolerance of +0.60/-0.00 mm, when the tread grooves are no longer more than 1.6 mm deep. a3c0
6.3.3.4. The height of tread-wear indicators is determined by measuring the difference between the depth, from the tread's surface, to the top of the tread-wear indicator and to the bottom of the tread groove close to the slope at the base of the tread-wear indicator. a3c0
7. MODIFICATIONS OF THE TYPE OF [DEL] TYRE AND EXTENSION OF APPROVAL a4c0
7.1. Every modification of the type of pneumatic tyre shall be notified to the Administrative Department which approved the type of [DEL] tyre. The department may then either: a4c0
7.1.1. Consider that the modifications made are unlikely to have an appreciable adverse effect and that in any case, the [DEL] tyre still complies with the requirements; or a4c0
7.1.2. Require a further test report from the Technical Service responsible for conducting the tests. a0c0
7.2. A modification of the tread pattern of the tyre shall not be considered to necessitate a repetition of the tests prescribed in paragraph 6. of this Regulation. a0c0
7.3. Confirmation or refusal of approval, specifying the alterations, shall be communicated by the procedure specified in paragraph 5.3. above to the Parties to the Agreement which apply this Regulation. a0c0
7.4. The Competent Authority issuing the extension of approval shall assign a series number for such an extension and 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. a0c0
8. CONFORMITY OF PRODUCTION a0c0
... The conformity of production procedures shall comply with those set out in the Agreement, Appendix 2 (E/ECE/324-E/ECE/TRANS/505/Rev.2), with the following requirements: a0c0
8.1. Tyres approved under this Regulation shall be so manufactured as to conform to the type approved, by meeting the requirements set forth in paragraph 6. above. a0c0
8.2. The authority which has granted type approval may at any time verify the conformity control methods applied in each production facility. For each production facility, the normal frequency of these verifications shall be at least once every two years. a0c0
9. PENALTIES FOR NON-CONFORMITY OF PRODUCTION a0c0
9.1. The approval granted in respect of a type of [DEL] tyre pursuant to this Regulation may be withdrawn if the requirements laid down in paragraph 8.1. above are not complied with or if the tyres taken from the series have failed to pass the tests prescribed in that paragraph. a4c0
9.2. If a Contracting Party to the Agreement applying this Regulation withdraws an approval it has previously granted, it shall forthwith so notify the other Contracting Parties applying this Regulation by means of a communication form conforming to the model in Annex 1 to this Regulation. a0c0
10. PRODUCTION DEFINITIVELY DISCONTINUED a0c0
... If the holder of an approval completely ceases to manufacture a type of [DEL] tyre approved in accordance with this Regulation, he shall so inform the 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. a4c0
11. TRANSITIONAL PROVISIONS a0c0
11.1. Contracting Parties applying this Regulation shall not refuse to grant extensions of approval to preceding series of amendments, or supplement to series of amendments to this Regulation. a0c0
11.2. No Contracting Parties applying this Regulation shall refuse a tyre approved to the 01 series of amendments to this Regulation. a0c0
11.3. Tread-wear indicators: a0c0
11.3.1. As from the date of entry into force of Supplement 4 to the 02 series of amendments, Contracting Parties applying this Regulation may no longer issue approvals pursuant to Supplement 3 to the 02 series of amendments with respect to the requirements of paragraph 6.3.3. a0c0
11.4.

Until 3 months after the date of entry into force of Supplement 22 to the 02 series of amendments to this Regulation, Contracting Parties applying this Regulation may continue to grant and/or extend type approvals according to the 02 series of amendments to this Regulation, without taking into account the provisions of Supplement 22 to the 02 series of amendments to this Regulation.

 a8c0
12. NAMES AND ADDRESSES OF TECHNICAL SERVICES RESPONSIBLE FOR CONDUCTING APPROVAL TESTS AND OF TYPE APPROVAL AUTHORITIES. a4c0
12.1. 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 the 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 definitively discontinued, issued in other countries, are to be sent. a4c0
12.2. The Contracting Parties to the 1958 Agreement which apply this regulation may designate laboratories of tyre manufacturers as approved test laboratories. a4c0
12.3. Where a Contracting Party to the 1958 Agreement applies paragraph 12.2. above, it may, if it so desires, be represented at the tests by one or more persons of its choice." a4c0
... Explanatory figure a0c0
... (see paragraph 2 of the Regulation) a0c0
... a0c0
A1  Annex 1 a0c0
A1  COMMUNICATION a0c0
A1  (maximum format: A4 (210 x 297 mm)) a0c0
A1  a0c0
A1 [1] Distinguishing number of the country which has granted/extended/refused/withdrawn approval (see approval provisions in the Regulation). a0c0
A1  concerning [2]: a0c0
A1  APPROVAL GRANTED a0c0
A1  APPROVAL EXTENDED a0c0
A1  APPROVAL REFUSED a0c0
A1  APPROVAL WITHDRAWN a0c0
A1  PRODUCTION DEFINITELY DISCONTINUED a0c0
A1  of a type of pneumatic tyre for motor vehicles pursuant to Regulation No. 30 a0c0
A1  Approval No. ..... Extension No. ..... a0c0
A1 1. Manufacturer's name and address: a4c0
A1 2. Tyre type designation: [3] a4c0
A1 2.1 Brand name(s)/trademark(s): a4c0
A1 2.2 Trade description(s)/ Commercial name(s): a4c0
A1 [DEL] [DEL] a4c0
A1 3. If applicable, name and address of manufacturer's representative: a4c0
A1 4. Summarized description: a4c0
A1 4.1 Tyre size designation: a4c0
A1 4.2 Category of use: normal/snow/special use/temporary use [2] a4c0
A1 4.3 Structure: diagonal/bias-belted/radial/run flat tyre [2] a4c0
A1 4.4 Speed category symbol: a4c0
A1 4.5 Load-capacity index: a4c0
A1 4.6 Extended Mobility Tyre: (Yes / No) [2] a7c0
A1 5. Technical Service and, where applicable, test laboratory approved a4c0
A1  for purposes of approval or of verification of conformity: a0c0
A1 6. Date of report issued by that service: a4c0
A1 7. Number of report issued by that service: a4c0
A1 8. Reason(s) of extension (if applicable): a4c0
A1 9. Any remarks: a4c0
A1 [DEL] [DEL] a4c0
A1 10. Place: a4c0
A1 11. Date: a4c0
A1 12. Signature: a4c0
A1 13. Annexed to this communication is a list of documents in the approval file deposited at the Administrative services having delivered the approval and which can be obtained upon request. a4c0
A1 [2] Strike out what does not apply. a0c0
A1 [3] A list of Brand name(s)/trademark(s) or Trade description(s)/ Commercial name(s) may be annexed to this communication a4c0
A2  Annex 2 a0c0
A2  EXAMPLE OF THE ARRANGEMENT OF THE APPROVAL MARK a0c0
A2  a0c0
A2  The above approval mark affixed to a [DEL]tyre shows that the type of tyre concerned has been approved in the Netherlands (E 4) under approval number 022439. a4c0
A2  Note: The first two digits of the approval number indicate that the approval was granted in accordance with the requirements of this Regulation as amended by the 02 series of amendments. a0c0
A2  The approval number must be placed close to the circle and either above or below the "E" or to left or right of that letter. The digits of the approval number must be on the same side of the "E" and face in the same direction. The use of Roman numerals as approval numbers should be avoided so as to prevent any confusion with other symbols. a0c0
A3  Annex 3 a0c0
A3  EARRANGEMENT OF TYRE MARKINGS a0c0
A3 1. Example of the markings to be borne by type of tyres placed on the market after the entry into force of this Regulation a0c0
A3  a3c0
A3  b = 6 mm (min.) a0c0
A3  c = 4 mm (min.) a0c0
A3  These markings define a [DEL] tyre: a4c0
A3  (a) having a nominal section width of 185; a0c0
A3  (b) having a nominal aspect ratio of 70; a0c0
A3  (c) of radial-ply structure (R); a0c0
A3  (d) having a nominal rim diameter of 14; a0c0
A3  (e) having a load capacity of 580 kg, corresponding to load index 89 in Annex 4 to this Regulation; a0c0
A3  (f) of speed category T (maximum speed 190 km/h); a0c0
A3  (g) for fitting without an inner tube ("tubeless"); a0c0
A3  (h) of "snow" type (M+S); a0c0
A3  (i) manufactured during the twenty-fifth week of the year 2003. a0c0
A3 2. In the particular case of tyres having a tyre to rim fitment configuration "A" or "U", the marking shall be in the form of the following example: a1c0
A3  185-560 R 400A, or 185-560 R 400U where: a1c0
A3  185 is the nominal section width in mm, a0c0
A3  560 is the outer diameter expressed in mm, a0c0
A3  R is an indication of the structure of the tyre see paragraph 2.25.3 of this Regulation, a7c0
A3  400 is the nominal diameter of the rim expressed in mm, a0c0
A3  A or U is the tyre to rim fitment configuration. a1c0
A3  The marking of the load index, speed category, date of manufacture and other markings, shall be as given in example 1 above. a0c0
A3 3. The positioning and order of the markings constituting the tyre designation shall be the following: a0c0
A3  (a) the size designation as defined in paragraph 2.25. of this Regulation shall be grouped as shown in the above examples: 185/70 R 14, P185/70 R 14, T185/70 R 14 and 185-560 R 400A or 185-560 R 400U; a7c0
A3  (b) the service description comprising the load index and the speed symbol shall be placed immediately after the tyre size designation as defined in paragraph 2.25. of this Regulation; a7c0
A3  (c) The symbols "TUBELESS", "REINFORCED", "M + S" and "ET" and "POR" may be at a distance from the size-designation. a3c0
A4  Annex 4 a0c0
A4  LOAD-CAPACITY INDICES a0c0
A4  a0c0
A5  Annex 5 a0c0
A5  TYRE SIZE DESIGNATION AND DIMENSIONS a0c0
A5  Table I. Tyres in Diagonal Construction (European tyres) a0c0
A5  a0c0
A5  a0c0
A5  Table II. Millimetric Series - Radial (European tyres) a0c0
A5  a0c0
A5  a0c0
A5 [1] Tolerance: see paragraphs 6.1.4. and 6.1.5. a0c0
A5 [2] The following size designations are accepted: 185-14/7.35-14 or 185-14 or 7.35-14 or 7.35-14/185-14. a0c0
A5  Table III. 45 Series - Radial on TR Metric 5A Rims a0c0
A5  a0c0
A6  Annex 6 a0c0
A6  METHOD OF MEASURING [DEL]PNEUMATIC TYRES a4c0
A6 1.1. Mount the tyre on the measuring rim specified by the manufacturer pursuant to paragraph 4.1.13. of this Regulation and inflate it to a pressure of 3 to 3.5 bar. a7c0
A6 1.2. Adjust the pressure as follows: a0c0
A6 1.2.1. in standard bias-belted tyres: to 1.7 bar; a0c0
A6 1.2.2. in diagonal (bias-ply) tyres: to: a0c0
A6  a0c0
A6 1.2.3. in standard radial tyres and in standard Run Flat tyres: to 1.8 bar; a7c0
A6 1.2.4. in reinforced radial tyres and in reinforced Run Flat tyres: to 2.2 bar; a7c0
A6 1.2.5. in T-tyre temporary use spare tyres: to 4.2. bar. a0c0
A6 2. Condition the tyre, mounted on its rim, at the ambient room temperature for not less than 24 hours, save as otherwise prescribed in paragraph 6.2.3. of this Regulation. a0c0
A6 3. Readjust the pressure to the level specified in paragraph 1.2. above. a0c0
A6 4. Measure the overall width by calliper at six equally-spaced points, taking the thickness of the protective ribs or bands into account. The highest measurement so obtained is taken as the overall width. a0c0
A6 5. Determine the outer diameter by measuring the maximum circumference and dividing the figure so obtained by π (3.1416). a0c0
A7  Annex 7 a0c0
A7  PROCEDURE FOR LOAD/SPEED PERFORMANCE TESTS a0c0
A7 1. Preparing the tyre a0c0
A7 1.1. Mount a new tyre on the test rim specified by the manufacturer pursuant to paragraph 4.1.13. of this Regulation. a7c0
A7 1.2. Inflate it to the appropriate pressure as given (in bar) in the table below: a0c0
A7  T-type temporary use spare tyres: to 4.2 bar. a0c0
A7  a7c0
A7 [1] The value of "3.2" in respect of Speed Category "Y" tyres was inadvertently omitted from Supplement 5 to the 02 series of amendments which entered into force on 8 January 1995 and may be considered as a Corrigendum to this Supplement and to have been effective from that same date. a0c0
A7 1.3. The manufacturer may request, giving reasons, the use of a test-inflation pressure differing from those given under paragraph 1.2. above. In such a case the tyre shall be inflated to that pressure. a0c0
A7 1.4. Condition the tyre-and-wheel assembly at test-room temperature for not less than three hours. a0c0
A7 1.5. Readjust the tyre pressure to that specified in paragraph 1.2. or 1.3. above. a0c0
A7 2. Carrying out the test a0c0
A7 2.1.

Mount the tyre-and-wheel assembly on a test axle and press it against the outer face of a smooth wheel 1.70 m ± 1 per cent or 2 m ± 1 per cent in diameter.

 a0c0
A7 2.2. Apply to the test axle a load equal to eighty per cent of: a4c0
A7 2.2.1. the maximum load rating equated to the Load Capacity Index for tyres with Speed Symbols L to H inclusive, a0c0
A7 2.2.2. The maximum load rating associated with a maximum speed of 240 km/h for tyres Speed Symbol "V" (see para. 2.40.2. of this Regulation). a7c0
A7 2.2.3. The maximum load rating associated with a maximum speed of 270 km/h for tyres with speed symbol "W" (see paragraph 2.40.3. of this Regulation). a7c0
A7 2.2.4. The maximum load rating associated with a maximum speed of 300 km/h for tyres with speed symbol "Y" (see paragraph 2.40.4. of this Regulation). a7c0
A7 2.3. Throughout the test the tyre pressure must not be corrected and the test load must be kept constant. a0c0
A7 2.4.

During the test the temperature in the test-room must be maintained at between 20° and 30° or at a higher temperature if the manufacturer agrees.

 a0c0
A7 2.5. Carry the test through, without interruption in conformity with the following particulars: a0c0
A7 2.5.1. time taken to pass from zero speed to initial test speed: 10 minutes; a0c0
A7 2.5.2.

Initial test speed: prescribed maximum speed for the type of tyre (see paragraph 2.37.1. of this Regulation), less 40 km/h in the case of the smooth wheel having 1.70 m ± 1 per cent in diameter or less 30 km/h in the case of the smooth wheel having 2 m ± 1 per cent in diameter;

 a7c0
A7 2.5.3. successive speed increments: 10 km/h; a0c0
A7 2.5.4. duration of test at each speed step except the last: 10 minutes; a0c0
A7 2.5.5. duration of test at last speed step: 20 minutes; a0c0
A7 2.5.6.

maximum test speed: prescribed maximum speed for the type of tyre, less 10 km/h in the case of the smooth wheel having 1.7 m ± 1 per cent in diameter or equal to the prescribed maximum speed in the case of the smooth wheel having 2 m ± 1 per cent in diameter.

 a0c0
A7 2.5.7. however, for tyres suitable for maximum speed of 300 km/h (speed symbol "Y"), the duration of the test is 20 minutes at the initial test speed step and 10 minutes at the last speed step. a0c0
A7 2.6. The procedure for the second test (see paragraph 6.2.1.1.), to assess the performance of a tyre suitable for speeds in excess of 300 km/h, shall be as follows: a0c0
A7 2.6.1. Apply to the test axle a load equal to 80 per cent of the maximum load rating associated with the maximum speed specified by the tyre manufacturer (see paragraph 4.1.16. of this Regulation). a7c0
A7 2.6.2. The test shall be run without interruptions in accordance with the following: a0c0
A7 2.6.2.1. Ten minutes to build up from zero to the maximum test speed for the second test. a4c0
A7 2.6.2.2. Five minutes at the maximum test speed for the second test. a4c0
A7 2.6.2.3.

Maximum test speed for the second test: maximum speed specified by the tyre manufacturer (see paragraph 4.1.15. of this Regulation), less 10 km/h in the case of the smooth wheel having 1.7 m ± 1 per cent in diameter or equal to the maximum speed specified by the tyre manufacturer in the case of the smooth wheel having 2 m ± 1 per cent in diameter.

 a4c0
A7 3. Procedure to assess the "flat tyre running mode" of "run flat tyre" a7c0
A7 3.1. Mount a new tyre on a test rim corresponding to the following specifications: a7c0
A7  (a) Measuring rim width, according to ISO 4000-1; a7c0
A7  (b) Contour with hump (round or flat) on both rim sides, according to ISO 4000-2. a7c0
A7 3.2.

[DEL] Inflate the tyre to an inflation pressure of 2.5 bar and condition the tyre-and-wheel assembly at a test room temperature of 38 ºC ± 3 ºC for not less than three hours.

 a10c0
A7 3.3. Remove the valve insert and wait until the tyre deflates completely. a0c0
A7 3.4.

Mount the tyre-and-wheel assembly to a test axle and press it against the outer surface of a smooth wheel 1.70 m ± 1 per cent or 2.0 m ± 1 per cent in diameter.

 a0c0
A7 3.5. Apply to the test axle a load equal to 65 per cent of the maximum load rating corresponding to the load capacity index of the tyre. a0c0
A7 3.6. At the start of the test, measure the deflected section height (Z1). a0c0
A7 3.7.

During the test the temperature of the test room must be maintained at 38 °C ± 3 °C.
The temperature sensor shall be at a distance not less than 0.15 m and not more than 1.00 m from the tyre sidewall.

 a10c0
A7 3.8. Carry the test through, without interruption in conformity with the following particulars: a0c0
A7 3.8.1. time taken to pass from zero speed to constant test speed: 5 minutes a0c0
A7 3.8.2.

test speed: 80 km/h in case of 2.0 m ± 1 per cent drum diameter, or 75 km/h in case of 1.7 m ± 1 per cent drum diameter

 a7c0
A7 3.8.3. duration of test at the test speed: 60 minutes a0c0
A7 3.9. At the end of the test, measure the deflected section height (Z2). a0c0
A7 3.9.1. Calculate the change in per cent of the deflected section height compared to the deflected section height at the start of the test as ((Z1 - Z2) / Z1) x 100. a0c0
A7 4. Procedure to assess the "flat tyre running mode" of "extended mobility tyres" a7c0
A7 4.1 Mount a new tyre on a test rim corresponding to the following specifications: a7c0
A7  (a) Measuring rim width, according to ISO 4000-1 a7c0
A7  (b) Contour with hump (round or flat) on both rim sides, according to ISO 4000-2. a7c0
A7 4.2

[DEL] Inflate it to an inflation pressure of 2.5 bar and condition the tyre-and-wheel assembly at a test room temperature of 25 ºC ± 3 ºC for not less than three hours.

 a10c0
A7 4.3 Remove the valve insert and wait until the tyre deflates completely. a7c0
A7 4.4

Mount the tyre-and-wheel assembly to a test axle and press it against the outer surface of a smooth wheel 1.70 m ± 1 per cent or 2.0 m ± 1 per cent in diameter.

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A7 4.5 Apply to the test axle a load equal to 60 per cent of the maximum load rating corresponding to the load capacity index of the tyre. a7c0
A7 4.6 At the start of the test, measure the deflected section height (Z1). a7c0
A7 4.7

During the test the temperature of the test room must be maintained at 25°C ± 3°C.
The temperature sensor shall be at a distance not less than 0.15 m and not more than 1.00 m from the tyre sidewall.

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A7 4.8 Carry the test through, without interruption in conformity with the following particulars: a7c0
A7 4.8.1. Time taken to pass from zero speed to constant test speed: 5 minutes a7c0
A7 4.8.2.

Test speed: 80 km/h in case of 2.0 m ± 1 per cent drum diameter, or 75 km/h in case of 1.7 m ± 1 per cent drum diameter

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A7 4.8.3. Duration of test at the test speed: 60 minutes a7c0
A7 4.9. At the end of the test, measure the deflected section height (Z2). a7c0
A7 4.9.1.

Calculate the change in per cent of the deflected section height compared to the deflected section height at the start of the test as ((Z1 - Z2) / Z1) x 100.

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A7 5. Equivalent test methods a7c0
A7  If a method other than that described in paragraphs 2. and/or 3., and/or 4. above is used, its equivalence must be demonstrated. a7c0