Regulation No. 108-00

Name:Regulation No. 108-00
Description:Retreaded Tyres.
Official Title:Uniform Provisions Concerning the Approval of: the Production of Retreaded Pneumatic Tyres for Motor Vehicles and their Trailers.
Country:ECE - United Nations
Date of Issue:1998-11-03
Amendment Level:00 Series, Supplement 3 (Including Erratum)
Number of Pages:33
Vehicle Types:Car, Component, Light Truck, Trailer
Subject Categories:Steering, Wheels and Tyres
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Keywords:

tyre, tyres, approval, regulation, production, tread, retreaded, speed, material, paragraph, retreading, means, rim, annex, load, test, diameter, maximum, unit, number, damage, ply, width, nominal, symbol, carcass, case, requirements, outer, size, section, designation, date, sidewall, retreader, type, radial, prescribed, designed, casing, original, index, authority, measuring, shown, structure, mark, year, pressure, wear

Text Extract:

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E/ECE/324 )
E/ECE/TRANS/505 ) Rev.2/Add.107/Amend.3/Corr.1
November 23, 2010
STATUS OF UNITED NATIONS REGULATION
ECE 108-00
UNIFORM PROVISIONS CONCERNING THE APPROVAL FOR:
THE PRODUCTION OF RETREADED PNEUMATIC TYRES
FOR MOTOR VEHICLES AND THEIR TRAILERS
Incorporating:
00 series of amendments
Date of Entry into Force: 23.06.98
Supplement 1 to the 00 series of amendments
Date of Entry into Force: 30.10.03
Supplement 2 to the 00 series of amendments
Date of Entry into Force: 23.06.05
Corr. 2 to the 00 series of amendments
Dated: 09.04.08
Supplement 3 to the 00 series of amendments (Including Erratum)
Date of Entry into Force: 17.03.10

REGULATION NO. 108
UNIFORM PROVISIONS CONCERNING THE APPROVAL FOR THE PRODUCTION
OF RETREADED PNEUMATIC TYRES FOR MOTOR VEHICLES AND THEIR TRAILERS
CONTENTS
REGULATION
1. Scope
2. Definitions
3. Markings
4. Application for approval
5. Approval
6. Requirements
7. Specifications
8. Modifications to the approval
9. Conformity of production
10. Penalties for non-conformity of production
11. Production definitely discontinued
12. Names and addresses of technical services responsible for conducting approval tests, of test
laboratories, and of administrative departments
ANNEXES
Annex 1 - Communication concerning the approval or extension or refusal or withdrawal of approval or
production definitely discontinued of a retreading production unit pursuant to
Regulation No. 108
Annex 2 - Arrangement of the approval marks
Annex 3 - Arrangement of retread tyre markings
Annex 4 - List of load indices and corresponding load capacities
Annex 5 - Tyre size designation and dimensions
Annex 6 - Method of measuring pneumatic tyres
Annex 7 - Procedure for load/speed endurance tests
Annex 8 - Explanatory figure

2.3.2. Snow tyre is a tyre whose tread pattern, or tread pattern and structure, is primarily
designed to ensure, in mud and fresh or melting snow, a performance better than that of a
normal tyre. The tread pattern of a snow tyre generally consists of groove (rib) and solid
block elements more widely spaced than on a normal tyre.
2.3.3. Temporary use spare tyre is a tyre different from that intended to be fitted to any vehicle
for normal driving conditions but intended only for temporary use under restricted driving
conditions.
2.3.4. "T" type temporary use spare tyre is a type of temporary use spare tyre designed for use
at inflation pressures higher than those established for standard and reinforced tyres.
2.4. "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.
2.5. "Cord" means the strands forming the fabric of the plies in the pneumatic-tyre.
2.6. "Ply" means a layer of "rubber" coated parallel cords.
2.7. "Belt" applies to a radial ply or bias belted tyre and means a layer or layers of material or
materials underneath the tread, laid substantially in the direction of the centre line of the
tread to restrict the carcass in a circumferential direction.
2.8. "Breaker" applies to a diagonal ply tyre and means an intermediate ply between the
carcass and tread.
2.9. "Chafer" means material in the bead area to protect the carcass against chafing or
abrasion by the wheel rim.
2.10. "Carcass" means that structural part of a pneumatic-tyre other than the tread and
outermost "rubber" of the sidewalls which, when inflated, supports the load.
2.11. "Tread" means that part of a pneumatic-tyre which is designed to come into contact with
the ground, protects the carcass against mechanical damage and contributes to ground
adhesion.
2.12. "Sidewall" means the part of a pneumatic tyre between the tread and the area designed to
be covered by the rim flange.
2.13. "Lower area of tyre" means the area included between the line of maximum section width
of the tyre and the area designed to be covered by the edge of the rim.
2.14. "Tread groove" means the space between the adjacent ribs or blocks in the tread pattern.
2.15. "Principal grooves" means the wide grooves situated in the central zone of the tread,
which cover approximately three-quarters of the breadth of the tread.
2.16. "Section width" means the linear distance between the outside of the sidewalls of an
inflated pneumatic-tyre, when fitted to the specified measuring rim, but excluding elevations
due to labelling (marking), decoration or protective bands or ribs.
2.17. "Overall width" means the linear distance between the outside of the sidewalls of an
inflated pneumatic-tyre, when fitted to the specified measuring rim, and including labelling
(marking), decoration or protective bands or ribs.

2.23. "Rim" means the support, either for a tyre-and-tube assembly or for a tubeless tyre, on
which the tyre beads are seated.
2.23.1. "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" or "A".
2.24. "Measuring rim" means the rim specified as a 'measuring rim width' or 'design rim width'
for a particular tyre size designation in any edition of one or more of the International Tyre
Standards.
2.25. "Test rim" means any rim specified as approved or recommended or permitted in one of
the International Tyre Standards for a tyre of that size designation and type.
2.26. "International Tyre Standard" means any one of the following standard documents:
(a)
The European Tyre and Rim Technical Organisation (ETRTO)
:
'Standards Manual'
(b)
The European Tyre and Rim Technical Organisation (ETRTO)
:
'Engineering Design Information - obsolete data'
(c)
The Tire and Rim Association Inc. (TRA)
:
'Year Book'
(d)
The Japan Automobile Tire Manufacturers Association (JATMA)
:
'Year Book'
(e)
The Tyre and Rim Association of Australia (TRAA)
:
'Standards Manual'
(f)
The Associaçiao Latino Americana de Pneus e Aros (ALAPA)
'Manual de Normas Technicas'
(g)
The Scandinavian Tyre and Rim Organisation (STRO)
:
'Data Book'
2.27. "Chunking" means the breaking away of pieces of rubber from the tread.
2.28. "Cord separation" means the parting of the cords from their rubber coating.
2.29. "Ply separation" means the parting of adjacent plies.
2.30. "Tread separation" means the pulling away of the tread from the carcass.

2.35.2. For speeds greater than 210 km/h but not exceeding 300 km/h, the maximum load rating
shall not exceed the percentage of the value associated with the load capacity index of the
tyre, given in the table below, with reference to the speed capability of the vehicle to which
the tyre is to be fitted.
Tyre speed symbol Maximum speed - km/h Maximum load rating - %
V 210
215
220
225
230
235
240
W 240
250
260
270
Y 270
280
290
300
100,0
98,5
97,0
95,5
94,0
92,5
91,0
100
95
90
85
100
95
90
85
For intermediate maximum speeds a linear interpolation of the maximum load rating is
permissible.
2.36. "Retreading production unit" means a site or group of localized sites where finished
retread tyres are produced.
2.37. "Retreading" means the generic term for reconditioning a used tyre by replacing the worn
tread with new material. It may also include renovation of the outermost sidewall surface. It
covers the following process methods:
2.37.1. "Top capping" - replacement of the tread.
2.37.2. "Re-capping" - replacement of the tread and with the new material extending over part of
the sidewall.
2.37.3. "Bead to bead" - replacement of the tread and renovation of the sidewall including all or
part of the lower area of the tyre.
2.38. "Casing" is the worn tyre comprising carcass and remaining tread and sidewall material.
2.39. "Buffing" is the process of removing old material from the casing to prepare the surface for
the new material.
2.40. "Repair" is the remedial work carried out to damaged casings within recognized limits.

3.2.3.3. On bias belted tyres; the letter "B" placed in front of the rim diameter marking and in addition
the words "BIAS-BELTED".
3.2.4. The service description comprising:
3.2.4.1. An indication of the tyre's nominal load capacity in the form of the load index prescribed in
Paragraph 2.33.
3.2.4.2. An indication of the tyre's nominal speed capability in the form of the symbol prescribed in
Paragraph 2.34.
3.2.5. The word "TUBELESS" if the tyre is designed for use without an inner tube.
3.2.6. The inscription M+S or MS or M.S. or M & S in the case of a snow tyre
3.2.7. The date of retreading as follows:
3.2.7.1. Up to December 31, 1999; either as prescribed in Paragraph 3.2.7.2. or in the form of a
group of three digits, the first two showing the week number and the third, the year of the
decade of manufacture. The date code can cover a period of production from the week
indicated by the week number up to and including the week number plus three. For
example, the marking "253" could indicate a tyre which was retreaded in weeks 25, 26, 27
or 28 of the year 1993.
The date code may be marked on one sidewall only.
3.2.7.2. As from January 1, 2000; in the form of a group of four digits, the first two showing the
week number and the second two showing the year in which the tyre was retreaded. The
date code can cover a period of production from the week indicated by the week number up
to and including the week number plus three. For example, the marking "2503" could
indicate a tyre which was retreaded in weeks 25, 26, 27 or 28 of the year 2003.
The date code may be marked on one sidewall only.
3.2.8. The term "RETREAD" or "REMOULD" (after January 1, 1999 only the word "RETREAD"
shall be used). At the request of the retreader, the same term in other languages may also
be added.
3.2.9. No later than two years after the date of entry into force of this amendment, tyres
manufactured using the "bead to bead" process as defined in Paragraph 2.37.3, or any
process in which the sidewall material is renewed, shall have the identification referred to in
Paragraph 2.21.4 placed only immediately after the rim diameter marking referred to in
Paragraph 2.21.3.
3.3. Prior to approval tyres shall exhibit a free space sufficiently large to accommodate an
approval mark as referred to in Paragraph 5.8. and as shown in Annex 2 to this Regulation.
3.4. Following approval, the markings referred to in Paragraph 5.8. and as shown in Annex 2 to
this Regulation shall be affixed in the free space referred to in Paragraph 3.3. This marking
may be affixed to one sidewall only.
3.5. The markings referred to in Paragraph 3.2. and the approval mark prescribed in
Paragraphs 3.4. and 5.8. shall be clearly legible and shall be moulded on to or into the tyre
or shall be permanently marked on to the tyre.

5.3. The approval authority shall ensure that the procedures and operations documentation for
each production unit contains specifications, appropriate to the repair materials and
processes used, of the limits of repairable damage or penetrations to the tyre carcass,
whether such damage is existing or is caused during the processes of preparation for
retreading.
5.4. Before granting approval the authority must be satisfied that retreaded tyres conform to this
Regulation and that the tests prescribed in Paragraphs 6.7. and 6.8. have been successfully
carried out on at least 5 and not necessarily more than 20 samples of retreaded tyres
representative of the range of tyres produced by the retreading production unit.
5.5. In the case of each failure being recorded during tests, two further samples of the same
specification tyre shall be tested. If either or both of these second two samples fail, then a
final submission of two samples shall be tested.
If either or both of the final two samples fail, then the application for approval of the
retreading production unit shall be rejected.
5.6. If all the requirements of this Regulation are met, then approval shall be granted and an
approval number shall be assigned to each retreading production unit approved. The first
two digits of this number 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 approval number shall be preceded by "108R" signifying that the approval
applies to a tyre retreaded as prescribed in this Regulation. The same authority shall not
assign the same number to another production unit covered by this Regulation.
5.7. Notice of approval or of extension, refusal or withdrawal of approval or of production
definitely discontinued 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.
5.8. There shall be affixed conspicuously to every retreaded tyre conforming to this Regulation,
in the space referred to in Paragraph 3.3. and in addition to the markings prescribed in
Paragraph 3.2., an international approval mark consisting of:
5.8.1. A circle surrounding the letter "E" followed by the distinguishing number of the country which
granted approval ; and
5.8.2. An approval number as described in Paragraph 5.6.
5.9. Annex 2 to this Regulation gives an example of the arrangements of the approval mark.

6.5. Preparation:
6.5.1. After buffing, and before the application of new material, each tyre shall be thoroughly
re-examined at least externally to ensure its continued suitability for retreading.
6.5.2. The entire surface to which new material is to be applied shall have been prepared without
overheating. The buffed surface texture shall not contain deep buffing lacerations or loose
material.
6.5.3. Where precured material is to be used the contours of the prepared area shall meet the
requirements of the material manufacturer.
6.5.4. Loose cord ends are not permissible.
6.5.5. Casing cords shall not be damaged during the preparation process.
6.5.6. Buffing damage to the belt of radial tyres shall be limited to localised damage to the
outermost layer only.
6.5.7. Buffing damage limits for diagonal ply tyres shall be as follows:
6.5.7.1. For two ply construction, there shall not be any damage to the carcass except for slight
localised buffing damage to the casing joint.
6.5.7.2. For two ply plus breaker construction of tubeless type tyres, there shall not be any damage
to the carcass or breaker.
6.5.7.3. For two ply plus breaker construction of tube type tyres, localised damage to the breaker is
permissible.
6.5.7.4. For four ply, or more, construction of tubeless type tyres, there shall not be any damage to
the carcass or breaker.
6.5.7.5. For four ply, or more, construction of tube type tyres, damage shall be limited to the
outermost ply in the crown area only.
6.5.8. Exposed steel parts shall be treated as soon as possible with appropriate material as
defined by the manufacturer of that appropriate material.
6.6. Retreading:
6.6.1. The retreader must ensure that either the manufacturer or the supplier of repair materials,
including patches, is responsible for the following:
(a)
(b)
(c)
defining method(s) of application and storage, if requested by the retreader, in the
national language of the country in which the materials are to be used;
defining limits of damage for which the materials are designed, if requested by the
retreader, in the national language of the country in which the materials are to be
used;
ensuring that reinforced patches for tyres, if correctly applied in carcass repairs, are
suitable for the purpose;

6.6.8.1.
For radial ply and bias belted tyres (mm):
1.5 ≤ (A+B) ≤ 5
(minimum 1.5 mm; maximum 5.0 mm)
A ≥ 1
(minimum 1.0 mm)
B ≥ 0.5
(minimum 0.5 mm)
P.D. =
Pattern depth
X
=
Buff line
A
=
Average thickness of new material under pattern
B
=
Minimum thickness of original material above belt after buffing
6.6.8.2. For diagonal (Bias-ply) tyres:
The thickness of original material above the breaker shall be ≥ 0.00 mm.
The average thickness of new material above the buffed casing line shall be ≥ 2.00 mm.
The combined thickness of original and new material beneath the base of the grooves of the
tread pattern shall be ≥ 2.00 and ≤ 5.00 mm.
6.6.9. The service description of a retreaded tyre shall not show either a higher speed symbol or a
higher load index than that of the original, first life, tyre.
6.6.10. The minimum speed capability of a retreaded tyre shall be 120 km/h ("L" speed symbol) and
the maximum shall be 300 km/h ("Y" speed symbol).
6.6.11. Tread wear indicators shall be incorporated as follows:
6.6.11.1. The retreaded pneumatic tyre shall include not less than six transverse rows of wear
indicators, approximately equi-spaced and situated in the principal grooves of the
tread. The tread wear indicators shall be such that they cannot be confused with the
material ridges between the ribs or blocks of the tread.

7.
SPECIFICATIONS
7.1.
Tyres retreaded to comply with this Regulation shall conform to the following dimensions:
7.1.1.
Section Width:
7.1.1.1.
The section width shall be calculated by the following formula:
S = S + K (A − A )
where:
S:
is the actual section width in millimetres as measured on the test rim;
S :
is the value of the 'Design Section Width', referred to the measuring rim, as quoted in
the International Tyre Standard specified by the retreader for the tyre size in question;
A: is the width of the test rim in millimetres;
A :
is the width in millimetres of the measuring rim as quoted in the International Tyre
Standard specified by the retreader for the tyre size in question.
K: is a factor and shall be taken to equal 0.4.
7.1.2. Outer Diameter:
7.1.2.1. The theoretical outer diameter of a retreaded tyre shall be calculated by the following
formula:
D = d + 2H
where:
D: is the theoretical outer diameter in millimetres;
d: is the conventional number defined in Paragraph 2.21.3., in millimetres;
H: is nominal section height in millimetres and is equal to S multiplied by 0.01 Ra
where:
S :
Ra:
is the nominal section width in millimetres;
is the nominal aspect ratio
All of the above symbols are as quoted in the tyre size designation as shown on the sidewall
of the tyre in conformity with the requirements of Paragraph 3.2.2. and as defined in
Paragraph 2.21.
7.1.2.2. However, for tyres whose designation is given in the first column of the tables in Annex 5 to
ECE Regulation No. 30, the outer diameter shall be that given in those tables.

8. MODIFICATIONS TO THE APPROVAL
8.1. Every modification concerning a retreading production unit amending any of the information
given by the retreading production unit in the Application for Approval, see Paragraph 4,
shall be notified to the approval authority which approved the retreading production
unit. That authority may then either:
8.1.1. Consider that the modifications made are unlikely to have an appreciable adverse effect and
that in any case the retreading production unit still meets the requirements; or
8.1.2. Require a further investigation of the approval.
8.2. Confirmation of, or refusal of, approval, specifying the modifications., shall be
communicated by the procedure specified in Paragraph 5.7. to the Parties to the Agreement
which apply this Regulation.
9. 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.
9.1. The retreading production unit approved according to this Regulation shall conform to the
requirements set out in Paragraph 6.
9.2. The holder of the approval shall ensure that, during each year of production, and spread
throughout that year, at least the following number of tyres, representative of the range
being produced, is checked and tested as prescribed in this Regulation:
9.2.1. 0.01% of the total annual production but in any case not less than 5 and not necessarily
more than 20.
9.3. If the requirements of Paragraph 9.2. are carried out by or under the control of the approval
authority, the results may be used as part of, or instead of, those prescribed in
Paragraph 9.4.
9.4. The authority which has approved the retreading production unit may at any time verify the
conformity control methods applied in each production facility. For each production facility
the type approval authority shall take samples at random during each and every production
year and at least the following number of tyres, representative of the range being produced,
shall be checked and tested as prescribed in this Regulation:
9.4.1. 0.01% of the total annual production but in any case not less than 5 and not necessarily
more than 20.
9.5. The tests and checks of Paragraph 9.4. may replace those required in Paragraph 9.2.
10. PENALTIES FOR NON-CONFORMITY OF PRODUCTION
10.1. The approval granted in respect of a retreading production unit pursuant to this Regulation
may be withdrawn if the requirements of Paragraph 9 are not complied with or if the
retreading production unit or the retreaded tyres produced by that retreading production unit
have failed to meet the requirements prescribed in that paragraph.

ANNEX 1
COMMUNICATION
(Maximum format: A4 (210 x 297 mm))
issued by:
Name of administration:
.....................................
.....................................
.....................................
Concerning:
APPROVAL GRANTED
APPROVAL EXTENDED
APPROVAL REFUSED
APPROVAL WITHDRAWN
PRODUCTION DEFINITELY DISCONTINUED
of a retreading production unit pursuant to Regulation No. 108.
Approval No......................................... Extension No. ................................
1. Retreader's name or trade mark: ....................................................................................................
2. Name and address of retreading production unit:...........................................................................
........................................................................................................................................................
3. If applicable, name and address of retreader's representative:......................................................
........................................................................................................................................................
4. Summarised description as in Paragraphs 4.1.3. and 4.1.4. of this Regulation: ............................
5. Technical service and, where applicable, test laboratory approved for purposes of approval or
verification of conformity: ................................................................................................................
6. Date of report issued by that service: .............................................................................................
7. Number of report issued by that service: ........................................................................................
8. Reason(s) of extension (if applicable):............................................................................................
9. Any remarks: ...................................................................................................................................

ANNEX 2
ARRANGEMENT OF APPROVAL MARK
The above approval mark affixed to a retreaded tyre shows that the retreading production unit concerned
has been approved in the Netherlands (E4) under approval number 108R002439, meeting the
requirements of this Regulation in its original form (00).
The approval number must be placed close to the circle and either above or below the "E" or 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.

400 is the nominal diameter of the rim expressed in mm
A is the tyre rim fitment configuration.
The marking of the load index, speed category date of manufacture and other markings,
shall be as given in the example above.
3. The positioning and order of
(a)
the size designation as defined in Paragraph 2.21 of this Regulation shall be grouped
as shown in the examples:
185/70 R 14 and 185-560 R 400A;
(b)
(c)
(d)
the service description comprising the load index and the speed symbol shall be
placed immediately after the tyre size designation as defined in Paragraph 2.21 of this
Regulation;
the symbols "TUBELESS", "REINFORCED", and "M + S" may be at a distance from
the size designation.
the word "RETREAD" may be at a distance from the size designation.

ANNEX 5
TYRE SIZE DESIGNATION AND DIMENSIONS
(IN ACCORDANCE WITH ECE REGULATION No. 30)
FOR THIS INFORMATION REFER TO ANNEX 5 OF ECE REGULATION NO. 30

ANNEX 7
PROCEDURE FOR LOAD/SPEED ENDURANCE TESTS
(IN PRINCIPLE IN ACCORDANCE WITH ANNEX 7 OF REGULATION No. 30)
1. PREPARING THE TYRE
1.1. Mount a retreaded tyre on the test rim specified by the retreader.
1.2. Inflate the tyre to the appropriate pressure as given (in bar) in the table below:
Speed
Category
Diagonal (bias-ply)
tyres
Radial Tyres
Bias-belted
tyres
Ply-rating
Standard
Reinforced
Standard
4
6
8
L, M, N
2.3
2.7
3.0
2.4


P, Q, R, S 2.6 3.0 3.3 2.6 3.0 2.6
T, U, H 2.8 3.2 3.5 2.8 3.2 2.8
V 3.0 3.4 3.7 3.0 3.4 −
W and Y 3.2 3.6
1.3. The retreading production unit may request, giving reasons, the use of a test inflation pressure
different from those given in Paragraph 1.2. of this annex. In this case the tyre shall be inflated
to the requested pressure.
1.4. Condition the tyre and wheel assembly at test-room temperature for not less than three hours.
1.5. Readjust the tyre pressure to that specified in Paragraph 1.2. or 1.3. of this annex.
2. TEST PROCEDURE
2.1. Mount the tyre and wheel assembly on a test axle and press it against the outer face of a
smooth surfaced power driven test drum either 1.70 m ± 1% or 2.00 m ± 1% diameter.
2.2. Apply to the test axle a load equal to 80% of:
2.2.1. The maximum load rating corresponding to the Load Index for tyres with Speed Symbols L to H
inclusive,
2.2.2. The maximum load rating associated with a maximum speed (see Paragraph 2.35.2. of this
Regulation) of:
– 240 km/h in the case of tyres of Speed Symbol "V",
– 270 km/h in the case of tyres of Speed Symbol "W",
– 300 km/h in the case of Speed Symbol "Y".
2.3. Throughout the test the tyre pressure must not be corrected and the test load must be kept
constant.

ANNEX 8
EXPLANATORY FIGURE
See Paragraph 2 of this Regulation
Retreaded Tyres.