30.3.2011   

EN

Official Journal of the European Union

L 84/46


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:

http://www.unece.org/trans/main/wp29/wp29wgs/wp29gen/wp29fdocstts.html

Regulation No 75 of the Economic Commission for Europe of the United Nations (UN/ECE) — Uniform provisions concerning the approval of pneumatic tyres for motor cycles and mopeds

Incorporating all valid text up to:

Supplement 13 to the Regulation in its original form — Date of entry into force: 24 October 2009

CONTENTS

REGULATION

1.

Scope

2.

Definitions

3.

Markings

4.

Application for approval

5.

Approval

6.

Requirements

7.

Modifications of the type of pneumatic tyre and extension of approval

8.

Conformity of production

9.

Penalties for non-conformity of production

10.

Production definitely discontinued

11.

Names and addresses of technical services responsible for conducting approval tests, and of administrative departments

ANNEXES

Annex 1 —

Communication concerning the approval or extension or refusal or withdraw of approval or production definitely discontinued of a type of pneumatic tyre for motor cycles and mopeds pursuant to Regulation No 75

Annex 2 —

Arrangement of the approval mark

Annex 3 —

Arrangement of tyre markings — Example of the markings to be borne by types of tyres placed on the market after the entry into force of this Regulation

Annex 4 —

Load capacity index/maximum mass correspondence

Annex 5 —

Tyre size designation and dimensions

Annex 6 —

Method of measuring pneumatic tyres

Annex 7 —

Procedure for load/speed performance tests

Annex 8 —

Tyre load capacities at various speeds

Annex 9 —

Test procedure for the dynamic growth of tyres

1.   SCOPE

This Regulation applies to new pneumatic tyres for vehicles of category L1, L2, L3, L4 and L5.

However, it does not apply to tyre types designed exclusively for the ‘off-road’ use, which are marked ‘NHS’ (Not for Highway Service) and to tyre types designed exclusively for competitions.

2.   DEFINITIONS

For the purpose of this Regulation:

2.1.

‘Type of pneumatic tyre’ means a category of pneumatic tyres which do not differ in such essential respects as:

2.1.1.

The manufacturer;

2.1.2.

Tyre size designation;

2.1.3.

Category of use (normal: for normal highway service; special: for special applications such as on-and off-the-road, snow, moped);

2.1.4.

Structure (diagonal or bias-ply, bias belted, radial);

2.1.5.

Speed category;

2.1.6.

Load capacity index;

2.1.7.

Tyre cross-section.

2.2.

‘Structure of a pneumatic tyre’ means the technical characteristics of the tyre’s carcass. The following structures of a pneumatic tyre are distinguished in particular:

2.2.1.

‘Diagonal’ or ‘bias ply’ describes a pneumatic tyre structure in which the ply cords extend to the beads and are laid at alternate angles substantially less than 90° to the centre line of the tread (1).

2.2.2.

‘Bias belted’ describes a pneumatic tyre structure of diagonal (bias-ply) type in which the carcass is restricted by a belt comprising two or more layers of substantially inextensible cord material laid at alternate angles close to those of the carcass.

2.2.3.

‘Radial’ describes a pneumatic tyre structure in which the ply cords extend to the beads and are laid substantially at 90° to the centreline of the tread, the carcass being stabilised by an essentially inextensible circumferential belt (1).

2.2.4.

‘Reinforced’ describes a pneumatic tyre structure in which the carcass is more resistant than that of the corresponding normal tyre.

2.3.

‘Bead’ means the part of a pneumatic tyre which is of such shape and structure as to fit the rim and hold the tyre on it (2).

2.4.

‘Cord’ means the strands forming the fabric of the plies in the pneumatic tyre (2).

2.5.

‘Ply’ means a layer of rubber-coated parallel cords (2).

2.6.

‘Carcass’ means that part of a pneumatic tyre other than the tread and the rubber side walls which, when inflated, bears the load (2).

2.7.

‘Tread’ means that part of a pneumatic tyre which comes into contact with the ground, protects the carcass against mechanical damage and contributes to ground adhesion (2).

2.8.

‘Side wall’ means the part of a pneumatic tyre between the tread and the area designed to be covered by the rim flange (2).

2.9.

‘Tread groove’ means the space between two adjacent ribs or blocks in the tread pattern (2).

2.10.

‘Principal groove’ means the wide grooves situated in the central zone of the tread.

2.11.

‘Section width (S)’ means the linear distance between the outsides of the side walls of an inflated pneumatic tyre, excluding elevations due to labelling (marking), decoration or protective bands or ribs (2).

2.12.

‘Overall width’ means the linear distance between the outsides of the side walls of an inflated pneumatic tyre, including labelling (marking), decoration and protective bands or ribs (2); in the case of tyres where the tread is wider than the section width, the overall width corresponds to the tread width.

2.13.

‘Section height (H)’ means a distance equal to half the difference between the outer diameter of the tyre and the nominal rim diameter (2).

2.14.

‘Nominal aspect ratio (Ra)’ means the centuple of the number obtained by dividing the number expressing the section height (H) by the number expressing the nominal section width (S1), both dimensions expressed in the same units.

2.15.

‘Outer diameter (D)’ means the overall diameter of an inflated new pneumatic tyre (2).

2.16.

‘Tyre-size designation’ is a designation showing:

2.16.1.

The nominal section width (S1) must be expressed in mm except in the case of types of tyre for which the size designation is shown in the first column of the tables in Annex 5 to this Regulation;

2.16.2.

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;

2.16.3.

A conventional number ‘d’ denoting the nominal diameter of the rim and corresponding to its diameter expressed either by code (numbers below 100) or in millimetres’ (numbers above 100).

2.16.3.1.

The values in millimetres of the symbol ‘d’ when indicated by a code are as follows:

(in mm)

Symbol ‘d’ indicated by one or two figures according to the nominal rim diameter

Value of ‘d’

4

102

5

127

6

152

7

178

8

203

9

229

10

254

11

279

12

305

13

330

14

356

15

381

16

406

17

432

18

457

19

483

20

508

21

533

22

559

23

584

2.17.

‘Nominal rim diameter (d)’ means the diameter of the rim on which a tyre is designed to be mounted (2).

2.18.

‘Rim’ means the support for a tyre-and-tube assembly, or for a tubeless tyre, on which the tyre beads are seated (2).

2.18.1.

‘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.

2.19.

‘Theoretical rim’ means the 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 the tyre.

2.20.

‘Measuring rim’ means the rim on which a tyre is required to be fitted for size measurements.

2.21.

‘Test rim’ means the rim on which a tyre is required to be fitted for testing.

2.22.

‘Chunking’ means the breaking away of pieces of rubber from the tread.

2.23.

‘Cord separation’ means the parting of the cords from their rubber coating.

2.24.

‘Ply separation’ means the parting of adjacent plies.

2.25.

‘Tread separation’ means the pulling away of the tread from the carcass.

2.26.

‘Load capacity index’ means a figure associated with the maximum load a tyre can carry at the speed corresponding to its speed symbol according to the operating conditions specified by the tyre manufacturer. A list of those indices and of the corresponding loads is given in Annex 4 to this Regulation.

2.27.

‘Table of tyre load capacities at various speeds’ means the table in Annex 8 which shows, by reference to indices of load capacity and of capacity at nominal speed, load variations of a tyre if used at speeds other than that corresponding to the index of its nominal speed category.

2.28.

‘Speed category’ means:

2.28.1.

The speeds, expressed by the speed category symbol as shown in the table in paragraph 2.28.2.

2.28.2.

The speed categories are as shown in the table below:

(km/h)

Speed category symbol

Corresponding speed

B

50

F

80

G

90

J

100

K

110

L

120

M

130

N

140

P

150

Q

160

R

170

S

180

T

190

U

200

H

210

V

240

W

270

2.28.3.

Tyres suitable for maximum speeds in excess of 240 km/h are identified by means of letter codes ‘V’ or ‘Z’ (see paragraph 2.33.3) placed within the tyre size designation in front of the indications of the structure (see paragraph 3.1.3).

2.29.

‘Snow tyre’ means a tyre whose tread pattern and whose structure are primarily designed to ensure in mud and fresh or melting snow a performance better than that of an ordinary (road-type) tyre. The tread pattern of a snow tyre generally consists of groove (rib) and/or solid-block elements more widely spaced than on an ordinary (road-type) tyre.

2.30.

‘MST’ means ‘multiservice tyre’, suitable both on and off road.

2.31.

‘Moped tyre’ means a tyre designed for the equipment of mopeds (categories L1 and L2).

2.32.

‘Motor cycle tyre’ means a tyre designed primarily for the equipment of motor cycles (categories L3, L4 and L5). However, they may also equip mopeds (categories L1 and L2) and light trailers (category 01).

2.33.

‘Maximum load rating’ means the maximum mass the tyre is rated to carry.

2.33.1.

For speeds lower or equal to 130 km/h, the maximum load rating must not exceed the percentage of the value associated with the relevant load capacity index of the tyre as indicated in the table ‘Load capacity variation with speed’ (see paragraph 2.27) with reference to the speed category symbol of the tyre and the speed capability of the vehicle to which the tyre is fitted.

2.33.2.

For speeds above 130 km/h but not exceeding 210 km/h, the maximum load rating must not exceed the value of the mass associated with the load capacity index of the tyre.

2.33.3.

For speeds above 210 km/h but not exceeding 270 km/h, the maximum load rating must not exceed the percentage of the mass, associated with the load capacity index of the tyre, indicated in the table below with reference to the speed category symbol of the tyre and the maximum design speed of the vehicle to which the tyre is to be fitted:

Maximum speed km/h (5)

Maximum Load Rating (%)

Speed Category Symbol V

Speed Category Symbol W (4)

210

100

100

220

95

100

230

90

100

240

85

100

250

(80) (3)

95

260

(75) (3)

85

270

(70) (3)

75

2.33.4.

For speeds in excess of 270 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 270 km/h and the maximum speed permitted by the tyre manufacturer, a linear interpolation of the maximum load rating applies.

3.   MARKINGS

3.1.

Pneumatic tyres submitted for approval shall bear on at least one side wall the following markings:

3.1.1.

The trade name or mark;

3.1.2.

The tyre size designation as defined in paragraph 2.16 of this Regulation;

3.1.3.

An indication of the structure as follows:

3.1.3.1.

On diagonal (bias-ply) tyres, no marking, or the letter ‘D’,

3.1.3.2.

On bias-belted tyres, the letter ‘B’ placed in front of the rim-diameter marking, and in addition the words ‘BIAS-BELTED’ can be added,

3.1.3.3.

On radial-ply tyres, the letter ‘R’ placed in front of the rim-diameter marking, and, the word ‘RADIAL’ can be added.

3.1.4.

An indication of the tyre’s speed category by means of the symbol shown in paragraph 2.28.2 above;

3.1.5.

The load-capacity index as defined in paragraph 2.26 above;

3.1.6.

The word ‘TUBELESS’ if the tyre is designed for use without an inner tube;

3.1.7.

The word ‘REINFORCED’ or ‘REINF’ if the tyre is a reinforced tyre;

3.1.8.

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. This marking, may be affixed to one side wall only.

3.1.9.

The inscription of ‘M + S’ or ‘M.S’ or ‘M & S’ in the case of a snow tyre. The inscription ‘DP’ (I.E. Dual Purpose) is accepted as a permitted alternative.

3.1.10.

The inscription MST in the case of multiservice tyres.

3.1.11.

The inscription ‘MOPED’ (or alternatively ‘CYCLOMOTEUR’ or ‘CICLOMOTORE’) in the case of moped tyres.

3.1.12.

An identification of the tyre to rim fitment configuration, when it differs from the standard configuration, immediately after the rim diameter marking referred to in paragraph 2.16.3 of this Regulation.

In the case of tyres intended to be fitted to rims having a diameter equivalent to code 13 (330 mm) or above, this inscription shall be ‘M/C’. This requirement shall not apply to any tyre sizes listed in the tables of Annex 5 to this Regulation.

3.1.13.

Tyres suitable for speeds above 240 km/h must be marked with the appropriate letter code ‘V’ or ‘Z’, as applicable (see paragraph 2.33.3) in front of the indication of the structure (see paragraph 3.1.3).

3.1.14.

Tyres suitable for speeds above 240 km/h or (270 km/h respectively) must bear, within parenthesis, the marking of the load capacity index (see paragraph 3.1.5) applicable at a speed of 210 km/h (or 240 km/h respectively) and a reference speed category symbol (see paragraph 3.1.4) as follows:

‘V’ in case of tyres identified with the letter code ‘V’ within the size designation.

‘W’ in case of tyres identified with the letter code ‘Z’ within the size designation.

3.2.

Tyres shall provide adequate space for the approval mark, as shown in Annex 2 to this Regulation.

3.3.

Annex 3 to this Regulation gives an example of the tyre markings.

3.4.

The markings referred to in paragraph 3.1 and the approval mark prescribed in paragraph 5.4 of this Regulation shall be moulded on, to or into the tyres. They shall be clearly legible.

4.   APPLICATION FOR APPROVAL

4.1.

The application for approval of a type of pneumatic tyre shall be submitted by the holder of the trade name or mark or by his duly accredited representative. It shall specify:

4.1.1.

The tyre-size designation as defined in paragraph 2.16 of this Regulation;

4.1.2.

The trade name or mark;

4.1.3.

The category of use (normal, special, snow or moped);

4.1.4.

Structure: diagonal (bias ply), bias belted or radial;

4.1.5.

The speed category;

4.1.6.

The load-capacity index of the tyre;

4.1.7.

Whether the tyre is to be used with or without an inner tube;

4.1.8.

Whether the tyre is ‘normal’ or ‘reinforced’;

4.1.9.

The ply-rating number of tyres for motor cycle derivatives (see table 5 of Annex 5 to this Regulation) (6);

4.1.10.

The overall dimensions: overall section width, and overall diameter;

4.1.11.

The rims on which the tyre can be mounted;

4.1.12.

The measuring rim and test rim;

4.1.13.

The test and measurement pressures;

4.1.14.

The factor X referred to in paragraph 2.19 above;

4.1.15.

For tyres identified by means of letter code ‘V’ within the size designation and suitable for speeds over 240 km/h or for tyres identified by means of letter code ‘Z’ within the size designation and suitable for speeds over 270 km/h, the maximum speed permitted by the tyre manufacturer and the load carrying capacity allowed for that maximum speed.

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 1 year after the date of issue of the type approval.

4.3.

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.

5.   APPROVAL

5.1.

If the pneumatic 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.

5.2.

An approval number shall be assigned to each type approved. Its first two digits (at present 00 for the Regulation in its original form) 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 number so assigned shall not be assigned by the same Contracting Party to another type of pneumatic tyre.

5.3.

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

5.3.1.

For tyres suitable for speeds above 240 km/h, the maximum speed permitted and the relevant load rating are specified under item 10 of Annex 1.

5.4.

There shall be affixed conspicuously to every pneumatic 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:

5.4.1.

A circle surrounding the letter ‘E’ followed by the distinguishing number of the country which has granted approval (7);

5.4.2.

The number of this Regulation, followed by the letter ‘R’, a dash and the type approval number.

5.5.

The approval mark shall be clearly legible and be indelible.

5.6.

Annex 2 to this Regulation gives an example of the arrangement of the approval mark.

6.   REQUIREMENTS

6.1.   Dimensions of tyres

6.1.1.   Section width of a tyre

6.1.1.1.

The section width is obtained by means of the following formula:

S = S1 + K (A – A1)

where:

S

is the ‘section width’ expressed in millimetres and measured on the measuring rim;

S1

is the ‘nominal section width’ (in millimetres) as shown on the side wall of the tyre in the designation of the tyre as prescribed;

A

is the width (expressed in millimetres) of the measuring rim, as shown by the manufacturer in the descriptive note;

A1

is the width (expressed in millimetres) of the theoretical rim;

A1

shall be taken to equal S1 multiplied by the Factor X specified by the manufacturer;

K

shall be taken to equal 0,4.

6.1.1.2.

However, for types of tyres for which the size designation is shown in the first column of the tables in Annex 5 to this Regulation, the section width shall be allowed to be that given opposite the tyre designation in the tables.

6.1.2.   Outer diameter of a tyre

6.1.2.1.

The outer diameter of a tyre is obtained by means of the following formula:

D = d + 2H

where:

D

is the outer diameter expressed in millimetres;

d

is the conventional number defined in paragraph 2.16.3 above expressed in millimetres;

H

is the nominal section height in millimetres and is equal to:

H = S1 × 0,01 Ra

where:

S1

is the nominal section width (in millimetres); and

Ra

is the nominal aspect ratio;

all as shown on the side wall of the tyre in the tyre designation in conformity with the requirements of paragraph 3.4 above.

6.1.2.2.

However, for types of tyres for which the size designation is shown in the first column of the tables in Annex 5 to this Regulation, the outer diameter shall be allowed to be that given opposite the tyre designation in the tables.

6.1.3.   Method of measuring pneumatic tyres

The dimensions of pneumatic tyres shall be measured by the procedure described in Annex 6 to this Regulation.

6.1.4.   Tyre section-width specifications

6.1.4.1.

The overall width of a tyre may be less than the section width S determined pursuant to paragraph 6.1.1 above.

6.1.4.2.

It may exceed that value up to the value shown in Annex 5 or for sizes not included in Annex 5 by the following percentages:

6.1.4.2.1.

For normal and snow service:

(a)

rim diameter code 13 and above: + 10 per cent;

(b)

rim diameter codes up to 12 inclusive: + 8 per cent.

6.1.4.2.2.

For special service tyres which are suitable for limited road use and are marked MST: 25 per cent.

6.1.5.   Tyre outer-diameter specifications

6.1.5.1.

The outer diameter of a tyre must not be outside the values Dmin and Dmax specified in Annex 5.

6.1.5.2.

For sizes not listed in Annex 5 the outer diameter of a tyre must not be outside the values Dmin and Dmax obtained from the following formulae:

 

Dmin = d + (2H × a)

 

Dmax = d + (2H × b)

where:

H and d are as defined in paragraph 6.1.2.1 and a and b are as specified in paragraphs 6.1.5.2.1 and 6.1.5.2.2 respectively.

6.1.5.2.1.

For normal highway service tyres and snow tyres a

Rim diameter code 13 and above

:

0,97

Rim diameter codes up to 12 inclusive

:

0,93

For special service tyres

:

1,00;

6.1.5.2.2.

For normal highway service tyres b

Rim diameter code 13 and above

:

1,07

Rim diameter codes up to 12 inclusive

:

1,10

For snow tyres and special service tyres

:

1,12.

6.2.   Load/speed performance test

6.2.1.

The pneumatic tyre shall undergo a load/speed performance test carried out by the procedure described in Annex 7 to this Regulation.

6.2.1.1.

Where application is made for tyres identified by means of letter code ‘V’ within the size designation and suitable for speeds over 240 km/h or for tyres identified by means of letter code ‘Z’ within the size designation and suitable for speeds over 270 km/h (see paragraph 4.1.15), the above load/speed test is carried out on one tyre at the load and speed conditions marked within parenthesis on the tyre (see paragraph 3.1.14). Another load/speed test must be carried out on a second tyre of the same type at the load and speed conditions, if any, specified as maximum by the tyre manufacturer (see paragraph 4.1.15).

6.2.2.

A tyre which after undergoing the load/speed test does not exhibit any tread separation, ply separation, cord separation, chunking or broken cords shall be deemed to have passed the test.

6.2.3.

The outer diameter of the tyre, measured at least 6 hours after the load/speed performance test, must not differ by more than ± 3,5 per cent from the outer diameter as measured before the test.

6.2.4.

The overall width of the tyre measured at the end of the load/speed performance test must not exceed the value determined in paragraph 6.1.4.2.

6.3.   Dynamic growth of tyres

The tyres indicated in paragraph 1.1 of Annex 9 to this Regulation, which have passed the test for load/speed performance requirements in accordance with paragraph 6.2 above, shall be submitted to a dynamic growth test to be carried out in accordance with the procedure described in the said Annex.

7.   MODIFICATIONS OF THE TYPE OF PNEUMATIC TYRE AND EXTENSION OF APPROVAL

7.1.

Every modification of the type of pneumatic tyre shall be notified to the administrative department which approved the type of pneumatic tyre. The department may then either:

7.1.1.

Consider that the modifications made are unlikely to have an appreciable adverse effect and that in any case, the pneumatic tyre still complies with the requirements; or

7.1.2.

Require a further test report from the technical service responsible for conducting the tests.

7.1.3.

A modification of the tread pattern of a tyre is deemed as not necessitating a repetition of the test specified in paragraph 6.2.

7.1.4.

Extensions of approval for tyres suitable for speeds over 240 km/h for tyres identified by means of letter code ‘V’ within the size designation (or 270 km/h for tyres identified by means of letter code ‘Z’ within the size designation), aiming at certification for different maximum speeds and/or loads, are permitted provided that a new test report, related to the new maximum speed and load rating, is supplied by the technical service responsible for carrying out tests.

Such new load/speed capabilities must be specified in item 9 of Annex 1.

7.2.

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.

7.3.

The competent authority granting the extension of approval shall assign a series number to each communication form drawn up for such an extension.

8.   CONFORMITY OF PRODUCTION

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:

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.

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 once every 2 years.

9.   PENALTIES FOR NON-CONFORMITY OF PRODUCTION

9.1.

The approval granted in respect of a type of pneumatic 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.

9.2.

If a 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.

10.   PRODUCTION DEFINITELY DISCONTINUED

If the holder of an approval completely ceases to manufacture a type of pneumatic 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.

11.   NAMES AND ADDRESSES OF TECHNICAL SERVICES RESPONSIBLE FOR APPROVAL TESTS, AND OF ADMINISTRATIVE DEPARTMENTS

11.1.

The Parties to the Agreement which apply this Regulation shall communicate to the United Nations Secretariat the names and addresses of the technical services responsible for approval tests and of the administrative departments which grant approval and to which forms certifying approval, or extension, or refusal or withdrawal of approval, issued in other countries, are to be sent.

11.2.

The Parties to the Agreement which apply this Regulation may use laboratories of tyre manufacturers and may designate, as approved, test laboratories among those which are situated on their territory or on the territory of another Party to the Agreement, subject to a preliminary agreement to the procedure by the competent administrative department of the latter.

11.3.

Where a Party to the 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.


(1)  Applicable also to Regulation No 54.

(2)  See the explanatory figure in the Appendix.

(3)  Applicable only to tyres identified by means of letter code ‘V’ within the size designation and up to the maximum speed specified by the tyre manufacturer.

(4)  Applicable also to tyres identified by means of letter code ‘Z’ within the size designation.

(5)  For intermediate speeds linear interpolation of maximum load rating is allowed.

(6)  From the date of entry into force of Supplement 8 to this Regulation no new approvals for these tyres should be issued pursuant to Regulation No 75. These tyre sizes are now included in Regulation No 54.

(7)  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 Union (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), 56 for Montenegro, 57 (vacant) and 58 for Tunisia. 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.


Appendix

EXPLANATORY FIGURE

(See paragraph 2 of the Regulation)

Image


ANNEX 1

COMMUNICATION

(maximum format: A4 (210 x 297 mm))

Image


ANNEX 2

ARRANGEMENT OF THE APPROVAL MARK

Image


ANNEX 3

ARRANGEMENT OF TYRE MARKINGS

Example of the markings to be borne by types of tyres placed on the market after the entry into force of this Regulation

Image

These markings define a pneumatic tyre:

Having a nominal section width of 100,

Having a nominal aspect ratio of 80,

Having a bias-belted structure,

Having a nominal rim diameter of 457 mm, for which the code is l8,

Having a load capacity of 206 kg, corresponding to load index 53 in Annex 4 to this Regulation,

Of speed category S (maximum speed 180 km/h),

For fitting without an inner tube (‘tubeless’),

Snow tyre manufactured in the 25th week of the year 2003.

The positioning and order of the markings constituting the tyre designation shall be the following:

(a)

The size designation, comprising the nominal section width, the nominal aspect ratio, the type-of-structure symbol (where applicable) and the nominal rim diameter shall be grouped as shown in the above example: 100/80Bl8;

(b)

The load index and the speed-category symbol shall be placed together near the size designation. They may either follow it or be placed above or below it;

(c)

The markings ‘TUBELESS’ and ‘REINFORCED’ or ‘REINF’ and ‘M + S’ and ‘MST’ and/or ‘MOPED’ (or CYCLOMOTEUR or CICLOMOTORE) may be at a distance from the size designation symbol;

(d)

In case of tyres suitable for speeds above 240 km/h the letter code ‘V’ or ‘Z’ as applicable, must be marked in front of the marking of structure (e.g. 140/60ZR18). The reference load capacity index and speed category symbol must be marked within parenthesis as applicable (see paragraph 3.1.14).


ANNEX 4

LOAD CAPACITY INDEX/MAXIMUM MASS CORRESPONDENCE

A

=

Load capacity index

B

=

Maximum corresponding mass (kg)


A

B

16

71

17

73

18

75

19

77,5

20

80

21

82,5

22

85

23

87,5

24

90

25

92,5

26

95

27

97

28

100

29

103

30

106

31

109

32

112

33

115

34

118

35

121

36

125

37

128

38

132

39

136

40

140

41

145

42

150

43

155

44

160

45

165

46

170

47

175

48

180

49

185

50

190

51

195

52

200

53

206

54

212

55

218

56

224

57

230

58

236

59

243

60

250

61

257

62

265

63

272

64

280

65

290

66

300

67

307

68

315

69

325

70

335

71

345

72

355

73

365

74

375

75

387

76

400

77

412

78

425

79

437

80

450

81

462

82

475

83

487

84

500

85

515

86

530

87

545

88

560

89

580

90

600


ANNEX 5

TYRE SIZE DESIGNATION AND DIMENSIONS

Table 1

Tyres for motor cycles

Sizes with rim diameter code 12 and below

Tyre size

Measuring rim width

(Code)

Overall diameter

(mm)

Section width

(mm)

Maximum overall width

(mm)

 

 

D.min

D

D.max

 

 

2.50 – 8

 

328

338

352

 

 

2.50 – 9

 

354

364

378

 

 

2.50 – 10

1.50

379

389

403

65

70

2.50 – 12

 

430

440

451

 

 

2.75 – 8

 

338

348

363

 

 

2.75 – 9

1.75

364

374

383

71

77

2.75 – 10

 

389

399

408

 

 

2.75 – 12

 

440

450

462

 

 

3.00 – 4

 

241

251

264

 

 

3.00 – 5

 

266

276

291

 

 

3.00 – 6

 

291

301

314

 

 

3.00 – 7

 

317

327

342

 

 

3.00 – 8

2.10

352

362

378

80

86

3.00 – 9

 

378

388

401

 

 

3.00 – 10

 

403

413

422

 

 

3.00 – 12

 

454

464

473

 

 

3.25 – 8

 

362

372

386

 

 

3.25 – 9

 

388

398

412

 

 

3.25 – 10

2.50

414

424

441

88

95

3.25 – 12

 

465

475

492

 

 

3.50 – 4

 

264

274

291

 

 

3.50 – 5

 

289

299

316

 

 

3.50 – 6

 

314

324

341

 

 

3.50 – 7

2.50

340

350

367

92

99

3.50 – 8

 

376

386

397

 

 

3.50 – 9

 

402

412

430

 

 

3.50 – 10

 

427

437

448

 

 

3.50 – 12

 

478

488

506

 

 

4.00 – 5

 

314

326

346

 

 

4.00 – 6

 

339

351

368

 

 

4.00 – 7

2.50

365

377

394

105

113

4.00 – 8

 

401

415

427

 

 

4.00 – 10

 

452

466

478

 

 

4,00 – 12

 

505

517

538

 

 

4.50 – 6

 

364

376

398

 

 

4.50 – 7

 

390

402

424

 

 

4.50 – 8

 

430

442

464

 

 

4.50 – 9

3.00

456

468

490

120

130

4.50 – 10

 

481

493

515

 

 

4.50 – 12

 

532

544

568

 

 

5.00 – 8

 

453

465

481

 

 

5.00 – 10

3.50

504

516

532

134

145

5.00 – 12

 

555

567

583

 

 

6.00 – 6

4.00

424

436

464

 

 

6.00 – 7

 

450

462

490

154

166

6.00 – 8

 

494

506

534

 

 

6,00 – 9

 

520

532

562

 

 


Table 1a

Tyres for mopeds

Sizes with rim diameter code 12 and below

Tyre size

Measuring rim width

(Code)

Overall diameter

(mm)

Section width

(mm)

Maximum overall width

(mm) (1)

 

 

D.min

D

D.max (1)

 

 

2 – 12

1.35

413

417

426

55

59

2-1/2 – 12

1.50

425

431

441

62

67

2-1/2 – 8

1.75

339

345

356

70

76

2-1/2 – 9

1.75

365

371

382

70

76

2-3/4 – 9

1.75

375

381

393

73

79

3 – 10

2.10

412

418

431

84

91

3 – 12

2.10

463

469

482

84

91


Table 2

Tyres for motor cycles

Normal section size

Tyre size

Measuring rim width

(Code)

Overall diameter

(mm)

Section width

(mm)

Maximum overall width

(mm)

 

 

D.min

D

D.max (2)

D.max (3)

 

 (2)

 (3)

1 3/4 – 19

1.20

582

589

597

605

50

54

58

2 – 14

 

461

468

477

484

 

 

 

2 – 15

 

486

493

501

509

 

 

 

2 – 16

 

511

518

526

534

 

 

 

2 – 17

 

537

544

552

560

 

 

 

2 – 18

1.35

562

569

577

585

55

58

63

2 – 19

 

588

595

603

611

 

 

 

2 – 20

 

613

620

628

636

 

 

 

2 – 21

 

638

645

653

661

 

 

 

2 – 22

 

663

670

680

686

 

 

 

2 1/4 – 14

 

474

482

492

500

 

 

 

2 1/4 – 15

 

499

507

517

525

 

 

 

2 1/4 – 16

 

524

532

540

550

 

 

 

2 1/4 – 17

 

550

558

566

576

 

 

 

2 1/4 – 18

1.50

575

583

591

601

62

66

71

2 1/4 – 19

 

601

609

617

627

 

 

 

2 1/4 – 20

 

626

634

642

652

 

 

 

2 1/4 – 21

 

651

659

667

677

 

 

 

2 1/4 – 22

 

677

685

695

703

 

 

 

2 1/2 – 14

 

489

498

508

520

 

 

 

2 1/2 – 15

 

514

523

533

545

 

 

 

2 1/2 – 16

 

539

548

558

570

 

 

 

2 1/2 – 17

 

565

574

584

596

 

 

 

2 1/2 – 18

1.60

590

599

609

621

68

72

78

2 1/2 – 19

 

616

625

635

647

 

 

 

2 1/2 – 20

 

641

650

660

672

 

 

 

2 1/2 – 21

 

666

675

685

697

 

 

 

2 1/2 – 22

 

692

701

711

723

 

 

 

2 3/4 – 14

 

499

508

518

530

 

 

 

2 3/4 – 15

 

524

533

545

555

 

 

 

2 3/4 – 16

 

549

558

568

580

 

 

 

2 3/4 – 17

 

575

584

594

606

 

 

 

2 3/4 – 18

1.85

600

609

621

631

75

80

86

2 3/4 – 19

 

626

635

645

657

 

 

 

2 3/4 – 20

 

651

660

670

682

 

 

 

2 3/4 – 21

 

676

685

695

707

 

 

 

2 3/4 – 22

 

702

711

721

733

 

 

 

3 – 16

 

560

570

582

594

 

 

 

3 – 17

 

586

596

608

620

 

 

 

3 – 18

1.85

611

621

633

645

81

86

93

3 – 19

 

637

647

659

671

 

 

 

3 1/4 – 16

 

575

586

598

614

 

 

 

3 1/4 – 17

 

601

612

624

640

 

 

 

3 1/4 – 18

2.15

626

637

651

665

89

94

102

3 1/4 – 19

 

652

663

675

691

 

 

 


Table 3

Tyres for motor cycles

Normal section sizes

Tyre size

Measuring rim width

(Code)

Overall diameter

(mm)

Section width

(mm)

Maximum overall width

(mm)

 

 

D.min

D

D.max (4)

D.max (5)

 

 (6)

 (7)

 (8)

2.00 – 14

 

460

466

478

 

 

 

 

 

2.00 – 15

 

485

491

503

 

 

 

 

 

2.00 – 16

 

510

516

528

 

 

 

 

 

2.00 – 17

1.20

536

542

554

 

52

57

60

65

2.00 – 18

 

561

567

579

 

 

 

 

 

2.00 – 19

 

587

593

605

 

 

 

 

 

2.25 – 14

 

474

480

492

496

 

 

 

 

2.25 – 15

 

499

505

517

521

 

 

 

 

2.25 – 16

 

524

530

542

546

 

 

 

 

2.25 – 17

1.60

550

556

568

572

61

67

70

75

2.25 – 18

 

575

581

593

597

 

 

 

 

2.25 – 19

 

601

607

619

623

 

 

 

 

2.50 – 14

 

486

492

506

508

 

 

 

 

2.50 – 15

 

511

517

531

533

 

 

 

 

2.50 – 16

 

536

542

556

558

 

 

 

 

2.50 – 17

1.60

562

568

582

584

65

72

75

79

2.50 – 18

 

587

593

607

609

 

 

 

 

2.50 – 19

 

613

619

633

635

 

 

 

 

2.50 – 21

 

663

669

683

685

 

 

 

 

2.75 – 14

 

505

512

524

530

 

 

 

 

2.75 – 15

 

530

537

549

555

 

 

 

 

2.75 – 16

 

555

562

574

580

 

 

 

 

2.75 – 17

1.85

581

588

600

606

75

83

86

91

2.75 – 18

 

606

613

625

631

 

 

 

 

2.75 – 19

 

632

639

651

657

 

 

 

 

2.75 – 21

 

682

689

701

707

 

 

 

 

3.00 – 14

 

519

526

540

546

 

 

 

 

3.00 – 15

 

546

551

565

571

 

 

 

 

3.00 – 16

 

569

576

590

596

 

 

 

 

3.00 – 17

1.85

595

602

616

622

80

88

92

97

3.00 – 18

 

618

627

641

647

 

 

 

 

3.00 – 19

 

644

653

667

673

 

 

 

 

3.00 – 21

 

694

703

717

723

 

 

 

 

3.00 – 23

 

747

754

768

774

 

 

 

 

3.25 – 14

 

531

538

552

560

 

 

 

 

3.25 – 15

 

556

563

577

585

 

 

 

 

3.25 – 16

 

581

588

602

610

 

 

 

 

3.25 – 17

2.15

607

614

628

636

89

98

102

108

3.25 – 18

 

630

639

653

661

 

 

 

 

3.25 – 19

 

656

665

679

687

 

 

 

 

3.25 – 21

 

708

715

729

737

 

 

 

 

3.50 – 14

 

539

548

564

572

 

 

 

 

3.50 – 15

 

564

573

589

597

 

 

 

 

3.50 – 16

 

591

598

614

622

 

 

 

 

3.50 – 17

2.15

617

624

640

648

93

102

107

113

3.50 – 18

 

640

649

665

673

 

 

 

 

3.50 – 19

 

666

675

691

699

 

 

 

 

3.50 – 21

 

716

725

741

749

 

 

 

 

3.75 – 16

 

601

610

626

634

 

 

 

 

3.75 – 17

 

627

636

652

660

 

 

 

 

3.75 – 18

2.15

652

661

677

685

99

109

114

121

3.75 – 19

 

678

687

703

711

 

 

 

 

4.00 – 16

 

611

620

638

646

 

 

 

 

4.00 – 17

 

637

646

664

672

 

 

 

 

4.00 – 18

2.50

662

671

689

697

108

119

124

130

4.00 – 19

 

688

697

715

723

 

 

 

 

4.25 – 16

 

623

632

650

660

 

 

 

 

4.25 – 17

 

649

658

676

686

 

 

 

 

4.25 – 18

2.50

674

683

701

711

112

123

129

137

4.25 – 19

 

700

709

727

737

 

 

 

 

4.50 – 16

 

631

640

658

668

 

 

 

 

4.50 – 17

 

657

666

684

694

 

 

 

 

4.50 – 18

2.75

684

691

709

719

123

135

141

142

4.50 – 19

 

707

717

734

745

 

 

 

 

5.00 – 16

 

657

666

686

698

 

 

 

 

5.00 – 17

 

683

692

710

724

 

 

 

 

5.00 – 18

3.00

708

717

735

749

129

142

148

157

5.00 – 19

 

734

743

761

775

 

 

 

 


Table 4

Tyres for motor cycles

Low section sizes

Tyre size

Measuring rim width

(Code)

Overall diameter

(mm)

Section width

(mm)

Maximum overall width

(mm)

 

 

D.min

D

D.max (9)

D.max (10)

 

 (11)

 (12)

 (13)

3.60 – 18

 

605

615

628

633

 

 

 

 

 

2.15

 

 

 

 

93

102

108

113

3.60 – 19

 

631

641

653

658

 

 

 

 

4.10 – 18

 

629

641

654

663

 

 

 

 

 

2.50

 

 

 

 

108

119

124

130

4.10 – 19

 

655

667

679

688

 

 

 

 

5.10 – 16

 

615

625

643

651

 

 

 

 

5.10 – 17

3.00

641

651

670

677

129

142

150

157

5.10 – 18

 

666

676

694

702

 

 

 

 

4.25/85 – 18

2.50

649

659

673

683

112

123

129

137

4.60 – 16

 

594

604

619

628

 

 

 

 

4.60 – 17

2.75

619

630

642

654

117

129

136

142

4.60 – 18

 

644

654

670

678

 

 

 

 

6.10 – 16

4.00

646

658

678

688

168

185

195

203


Table 5

Tyres for motor cycle derivatives  (14)

Tyre size

Measuring rim width

(Code)

Overall diameter

(mm)

Section width

(mm)

Maximum overall width

(mm)

 

 

D.min

D

D.max

 

 

3.00 – 8C

 

359

369

379

 

 

3.00 – 10C

2.10

410

420

430

80

86

3.00 – 12C

 

459

471

479

 

 

3.50 – 8C

 

376

386

401

 

 

3.50 – 10C

2.50

427

437

452

92

99

3.50 – 12C

 

478

488

503

 

 

4.00 – 8C

 

405

415

427

 

 

4.00 – 10C

3.00

456

466

478

108

117

4.00 – 12C

 

507

517

529

 

 

4.50 – 8C

 

429

439

453

 

 

4.50 – 10C

3.50

480

490

504

125

135

4.50 – 12C

 

531

541

555

 

 

5.00 – 8C

 

455

465

481

 

 

5.00 – 10C

3.50

506

516

532

134

145

5.00 – 12C

 

555

567

581

 

 


Table 6

Motor cycle tyres

Low pressure sizes

Tyre size

Measuring rim width

(Code)

Overall diameter

(mm)

Section width

(mm)

Maximum overall width

(mm)

 

 

D.min

D

D.max

 

 

5.4 – 10

 

474

481

487

 

 

5.4 – 12

 

525

532

547

 

 

5.4 – 14

4.00

575

582

598

135

143

5.4 – 16

 

626

633

649

 

 

6.7 – 10

 

532

541

561

 

 

6.7 – 12

5.00

583

592

612

170

180

6.7 – 14

 

633

642

662

 

 


Table 7

Motor cycle tyres

Sizes and dimensions of American tyres

Tyre size

Measuring rim width

(Code)

Overall diameter

(mm)

Section width

(mm)

Maximum overall width

(mm)

 

 

D.min

D

D.max

 

 

MH90 – 21

1.85

682

686

700

80

89

MJ90 – 18

2.15

620

625

640

 

 

 

 

 

 

 

89

99

MJ90 – 19

2.15

645

650

665

 

 

ML90 – 18

2.15

629

634

650

 

 

 

 

 

 

 

93

103

ML90 – 19

2.15

654

659

675

 

 

MM90 – 19

2.15

663

669

685

95

106

MN90 – 18

2.15

656

662

681

104

116

MP90 – 18

2.15

667

673

692

108

120

MR90 – 18

2.15

680

687

708

114

127

MS90 – 17

2.50

660

667

688

121

134

MT90 – 16

3.00

642

650

672

 

 

 

 

 

 

 

130

144

MT90 – 17

3.00

668

675

697

 

 

MU90 – 15M/C

3.50

634

642

665

 

 

 

 

 

 

 

142

158

MU90 – 16

3.50

659

667

690

 

 

MV90 – 15M/C

3.50

643

651

675

150

172

MP85 – 18

2.15

654

660

679

108

120

MR85 – 16

2.15

617

623

643

114

127

MS85 – 18

2.50

675

682

702

121

134

MT85 – 18

3.00

681

688

709

130

144

MU85 – 16M/C

3.50

650

658

681

142

158

MV85 – 15M/C

3.50

627

635

658

150

172


(1)  Normal road (highway) service.

(2)  Normal highway service.

(3)  Special service and snow tyres.

(4)  Tyres for normal highway service.

(5)  Tyres for special service and snow tyres.

(6)  Tyres for normal highway service up to speed category P inclusive.

(7)  Tyres for normal highway service above speed category P and snow tyres.

(8)  Tyres for special service.

(9)  Tyres for normal highway service.

(10)  Tyres for special service and snow tyres.

(11)  Tyres for normal highway service up to speed category P inclusive.

(12)  Tyres for normal highway service above speed category P and snow tyres.

(13)  Tyres for special service.

(14)  From the date of entry into force of Supplement 8 to this Regulation no new approvals for these tyres should be issued pursuant to Regulation No 75. These tyre sizes are now included in Regulation No 54, Annex 5, Part I, Table A.


ANNEX 6

METHOD OF MEASURING PNEUMATIC TYRES

1.

The tyre is mounted on the measuring rim specified by the manufacturer pursuant to paragraph 4.1.12 of this Regulation and is inflated to a pressure specified by the manufacturer.

As an alternative, inflation pressures could be specified as follows:

Tyre version

Speed category

Pressure

 

 

bar

kPa

Standard

F, G, J, K, L, M, N, P, Q, R, S

2,25

225

T, U, H, V, W

2,80

280

Reinforced

F to P

 

 

 

Q, R, S, T, U, H, V

3,30

330

Motorcycle Derivatives (1)

4PR

F to M

3,50

350

 

6PR

4,00

400

 

8PR

4,50

450

Moped

Standard

B

2,25

225

Reinforced

B

2,80

280

For other tyre versions, inflate to the pressure specified by the tyre manufacturer.

2.

The tyre fitted on its rim is conditioned to the ambient temperature of the laboratory for at least 24 hours.

3.

The pressure is readjusted to the value specified in paragraph 1 above.

4.

The overall width is measured by calliper at six equally-spaced points, account being taken of the thickness of the protective ribs or bands. The highest measurement so obtained is taken as the overall width.

5.

The outer diameter is determined by measuring the maximum circumference and dividing the figure so obtained by π (3,1416).


(1)  From the date of entry into force of Supplement 8 to this Regulation no new approvals for these tyres should be issued pursuant to Regulation No 75. These tyre sizes are now included in Regulation No 54.


ANNEX 7

PROCEDURE FOR LOAD/SPEED PERFORMANCE TESTS

1.   PREPARATION OF TYRE

1.1.

Mount a new tyre on the test rim specified by the manufacturer pursuant to paragraph 4.1.12 of this Regulation.

1.2.

Inflate the tyre to the appropriate pressure given in the following table:

Testing inflation pressure (bars)

Tyre size

Speed Category

Inflation pressure

bar

kPa

Standard

F, G, J, K

2,50

250

L, M, N, P

2,50

250

Q, R, S

3,00

300

T, U, H, V

3,50

350

Reinforced

F, G, J, K, L, M, N, P

3,30

330

Q, R, S, T, U, H, V

3,90

390

Motorcycle Derivatives (1)

4PR

F, G, J, K, L, M

3,70

370

6PR

4,50

450

8PR

5,20

520

Moped

Standard

B

2,50

250

Reinforced

B

3,00

300

For speeds above 240 km/h, the test pressure is 3,20 bar (320 kPa).

For other types of tyre, inflate to the pressure specified by the manufacturer.

1.3.

The manufacturer may request, giving reasons, the use of test-inflation pressures differing from those given under paragraph 1.2 above. In such a case the tyre shall be inflated to that pressure.

1.4.

Condition the tyre-and-wheel assembly at test room temperature for not less than 3 hours.

1.5.

Readjust the tyre pressure to that specified in paragraph 1.2 or 1.3 above.

2.   TEST PROCEDURE

2.1.

Mount the tyre-and-wheel assembly on the test axle and press it against the outer face of a smooth test drum of 1,70 m ± 1 per cent or 2,0 m ± 1 per cent in diameter.

2.2.

Apply to the test axle a load equal to 65 per cent of:

2.2.1.

The maximum load rating equated to the Load Capacity Index for tyres with speed symbols up to H inclusive;

2.2.2.

The maximum load rating associated with a maximum speed of 240 km/h for tyres with speed symbol ‘V’ (see paragraph 2.33.3 of this Regulation);

2.2.3.

The maximum load rating associated with a maximum speed of 270 km/h for tyres with speed symbol ‘W’ (see paragraph 2.33.3);

2.2.4.

The maximum load rating associated with the maximum speed specified by the tyre manufacturer for tyres suitable for speeds above 240 km/h (or 270 km/h as applicable) (see paragraph 6.2.1.1).

2.2.5.

In case of moped tyres (speed category symbol B) the test load is 65 per cent on a 1,7 m diameter test drum and 67 per cent on a 2,0 m diameter test drum.

2.3.

The tyre pressure must not be corrected throughout the test and the test load must be kept constant.

2.4.

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

2.5.

The test shall be run without interruption, in accordance with the following:

2.5.1.

Twenty minutes is allowed to build up from zero to the initial test speed;

2.5.2.

Initial tests speed: 30 km/h less than the speed corresponding to the speed category symbol marked on the tyre (see paragraph 2.28.2 of this Regulation) if a 2,0 m diameter test drum is used, or 40 km/h less if a 1,7 m diameter test drum is used;

2.5.2.1.

The maximum speed to be considered for the second test in case of tyres suitable for speeds above 240 km/h for tyres identified by means of letter code ‘V’ within the size designation (or 270 km/h for tyres identified by means of letter code ‘Z’ within the size designation) is the maximum speed specified by the tyre manufacturer (see paragraph 4.1.15).

2.5.3.

Speed steps of 10 km/h;

2.5.4.

Test duration at each speed step: 10 minutes;

2.5.5.

Total duration of the test: 1 hour;

2.5.6.

Maximum test speed: the maximum rated speed of the type of tyre if the test is performed with a 2,0 m diameter test drum; maximum rated speed for the type of tyre less 10 km/h if the test is performed with a 1,7 m diameter test drum.

2.5.7.

In case of moped tyres (speed category symbol B), the test speed is 50 km/h, the build-up from 0 to 50 km/h is 10 minutes, the duration at the speed step is 30 minutes with a total duration of the test of 40 minutes.

2.6.

However, in case a second test is performed to assess the top performances of tyres suitable for speed above 240 km/h, the procedure shall be the following:

2.6.1.

Twenty minutes to build up from zero to the initial test speed;

2.6.2.

Twenty minutes at the initial test speed;

2.6.3.

Ten minutes to build up to the maximum test speed;

2.6.4.

Five minutes at the maximum test speed.

3.   EQUIVALENT TESTS

If a test other than that described above is used, its equivalence must be proved.


(1)  From the date of entry into force of Supplement 8 to this Regulation no new approvals for these tyres should be issued pursuant to Regulation No 75. These tyre sizes are now included in Regulation No 54.


ANNEX 8

TYRE LOAD CAPACITIES AT VARIOUS SPEEDS

Image


ANNEX 9

TEST PROCEDURE FOR THE DYNAMIC GROWTH OF TYRES

1.   SCOPE AND RANGE OF APPLICATION

1.1.   This testing procedure is applicable for tyres mentioned in paragraphs 3.4.1 and 4.1 below.

1.2.   It serves to determine the maximum tyre growth under the influence of centrifugal forces at the admissible maximum speed.

2.   DESCRIPTION OF TEST PROCEDURE

2.1.   The test axle and the rim must be controlled in order to assure a radial run-out less than ± 0,5 mm and a lateral run-out less than ± 0,5 mm, when measured at the bead seat of the wheel.

2.2.   Contour outline device

Any device (projecting grid, camera, spot lights and others) which permits the external contour of the tyre cross-section to be outlined distinctly, or to establish an enveloping curve, normal to the tyre equator, at the point of the maximum deformation of the tread.

The device should reduce to a minimum any distortion and assure a constant (known) ratio (K) between the plotted contour and the actual tyre dimensions.

The device shall permit reference of the tyre contour to the wheel axis.

2.3.   The deviation of the tyre tread peripheral speed, measured with a stroboscope, from the corresponding maximum speed of the tyre may not exceed ± 2 per cent.

2.4.   If another test procedure is applied, it must be proved to be equivalent to the present procedure.

3.   EXECUTION OF TEST

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

3.2.   The tyres to be tested shall have passed the load speed performance test according to Annex 7 to the Regulation, without showing any defect.

3.3.   The tyre to be tested shall be fitted to a wheel having a rim conforming to the applicable standard.

3.4.   The tyre inflation pressure (testing pressure) shall be adjusted to the values indicated in paragraph 3.4.1 below.

3.4.1.

Road tyres in bias and bias/belted construction.

Speed category

Tyre construction

Testing pressure

 

 

bar

kPA

P/Q/R/S

standard

2,5

250

T and above

standard

2,9

290

3.5.   The tyre/wheel assembly shall be stored at the temperature of the testing room for a period of at least 3 hours.

3.6.   After this conditioning storage period the inflation pressure shall be readjusted to the value indicated in paragraph 3.4.

3.7.   Mount the tyre and rim assembly on the test axle and ensure the assembly is freely rotating. The tyre can be rotated either by means of a drive motor acting on the tyre axis or by pressing it against a test drum.

3.8.   Accelerate the assembly without interruption to reach within five minutes the maximum speed capability of the tyre.

3.9.   Position the contour outline device and ascertain that it is perpendicular to the rotation of the test tyre tread.

3.10.   Check that the peripheral speed of the tread surface is within ± 2 per cent of the maximum speed capability for the tyre. Maintain the equipment at constant speed for at least five minutes and then portray the tyre cross-section in the area of maximum deformation, or check that the tyre does not exceed the enveloping curve.

4.   EVALUATION

4.1.   The limiting curve (enveloping curve) specified for the mounted tyre/wheel assembly shall be as in the example below):

Enveloping curve for centrifugal growth test

Image

In accordance with paragraphs 6.1.4 and 6.1.5 of the Regulation, the following limit values have been established for the enveloping curve:

Speed Category

H dyn (mm)

 

Category of Use:

Normal

Category of Use:

Snow and special

P/Q/R/S

H × 1,10

H × 1,15

T/U/H

H × 1,13

H × 1,18

Over 210 km/h

H × 1,16

4.1.1.

The main dimensions of the enveloping curve must be adjusted, if applicable, taking into account the constant ratio K (see paragraph 2.2 above).

4.2.   The contour of the tyre portrayed at the maximum speed shall not exceed the enveloping curve, with reference to the tyre axes.

4.3.   The tyre is not subjected to a further test.