Regulation No. 54-00

Name:Regulation No. 54-00
Description:Tyres - Commercial Vehicles.
Official Title:Uniform Provisions Concerning the Approval of: Pneumatic Tyres for Commercial Vehicles and their Trailers.
Country:ECE - United Nations
Date of Issue:1983-06-30
Amendment Level:00 Series, Supplement 21
Number of Pages:47
Vehicle Types:Bus, Component, Heavy Truck, Light Truck, Trailer
Subject Categories:Steering, Wheels and Tyres
Available on InterRegs.NET

Our online subscription service, offering immediate access to our extensive library of global vehicle regulations, standards and legislation. A fully searchable, accurate, user-friendly resource for consolidated regulations that are updated quickly and frequently.

Tell me more | Already a subscriber

Available on SelectRegs.com

Our fast and easy means of purchasing up-to-date global vehicle and component standards and regulations on a pay-as-you-go basis. Pay securely by credit card and your documents are delivered directly and immediately to your computer as PDF files.

Tell me more | Go straight to site

Keywords:

tyre, tyres, approval, regulation, rim, speed, paragraph, diameter, load, width, type, means, annex, nominal, series, test, designation, symbol, amendments, category, section, outer, date, manufacturer, index, force, code, entry, supplement, diagonal, tread, radial, measuring, production, case, table, load-capacity, normal, description, single, approved, marking, shown, size, indices, number, equal, snow, service, pressure

Text Extract:

All InterRegs documents are formatted as PDF files and contain the full text, tables, diagrams and illustrations of the original as issued by the national government authority. We do not re-word, summarise, cut or interpret the regulatory documents. They are consolidated, published in English, and updated on a regular basis. The following text extract indicates the scope of the document, but does not represent the actual PDF content.

E/ECE/324
) Rev.1/Add.53/Rev.3/Amend.3
E/ECE/TRANS/505 )
February 22, 2017
STATUS OF UNITED NATIONS REGULATION
ECE 54
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF:
PNEUMATIC TYRES FOR COMMERCIAL VEHICLES AND THEIR TRAILERS
Incorporating:
Supplement 5 to the 00 series of amendments
Date of Entry into Force: 10.06.94
Supplement 6 to the 00 series of amendments
Date of Entry into Force: 18.04.95
Supplement 7 to the 00 series of amendments
Date of Entry into Force: 15.08.95
Supplement 8 to the 00 series of amendments
Date of Entry into Force: 26.12.96
Supplement 9 to the 00 series of amendments
Date of Entry into Force: 22.02.97
Corr. 1 to Revision 1 to the 00 series of amendments
Dated: 23.06.97
Supplement 10 to the 00 series of amendments
Date of Entry into Force: 24.05.98
Supplement 11 to the 00 series of amendments
Date of Entry into Force: 07.02.99
Supplement 12 to the 00 series of amendments
Date of Entry into Force: 29.12.00
Supplement 13 to the 00 series of amendments
Date of Entry into Force: 29.03.01
Supplement 14 to the 00 series of amendments
Date of Entry into Force: 21.02.02
Supplement 15 to the 00 series of amendments
Date of Entry into Force: 30.10.03
Corr. 1 to Revision 2 to the 00 series of amendments
Dated: 09.05.05
Corr. 1 to Supplement 15 to the 00 series of amendments
Dated: 23.06.04
Supplement 16 to the 00 series of amendments
Date of Entry into Force: 13.11.04
Supplement 17 to the 00 series of amendments
Date of Entry into Force: 17.03.10
Erratum to Revision 2 to the 00 series of amendments
Supplement 18 to the 00 series of amendments (Revision 3)
Date of Entry into Force: 27.01.13
Corr. 1 to Revision 3 to the 00 series of amendments
(Erratum by the Secretariat)
Dated: 18.12.13
Corr. 2 to Revision 3 to the 00 series of amendments
Dated: 25.06.14
Supplement 19 to the 00 series of amendments
Date of Entry into Force: 22.01.15
Supplement 20 to the 00 series of amendments
Date of Entry into Force: 20.01.16
Supplement 21 to the 00 series of amendments
Date of Entry into Force: 09.02.17

REGULATION No. 54
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF
PNEUMATIC TYRES FOR COMMERCIAL VEHICLES AND THEIR TRAILERS
REGULATION
CONTENTS
1.
Scope
2.
Definitions
3.
Markings
4.
Application for approval
5.
Approval
6.
Specifications
7.
Modification and extension of approval of a tyre type
8.
Conformity of production
9.
Penalties for non-conformity of production
10.
Production definitively discontinued
11.
Names and addresses of Technical Services responsible for conducting approval tests, and of
Type Approval Authorities
ANNEXES
Annex 1
Annex 2
Annex 3
Annex 4
Annex 5
Communication
Arrangement of approval mark
Arrangement of tyre markings
List of symbols of load-capacity indices
Tyre-size designation and dimensions:
Part I
Part II
European tyres;
United States tyres
Annex 6
Annex 7
Method of dimension measurement for measuring tyres
Procedure for load/speed endurance tests
Appendix 1
Appendix 2
Endurance-test programme
Relation between the pressure index and the units of pressure
Annex 8
Annex 9
Variation in load-capacity with speed commercial vehicle tyres, – Radial and diagonal
Communication – Upgrade of Service Description for the purposes of retreading in
accordance with Regulation No. 109

2.5. Category of Use
2.5.1. "Normal tyre" means a tyre intended for normal, on road use;
2.5.2. "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.
2.5.3. "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;
2.2.5.1. "Professional off-road tyre" is a special use tyre primarily used for service in severe
off-road conditions;
2.6. "Structure" of a tyre means the technical characteristics of the tyre's carcass. A distinction
is made between the following structures in particular:
2.6.1. "Diagonal" or "bias-ply" describes a tyre structure in which the ply cords extend to the
beads and are laid at alternate angles substantially less than 90° to the centreline of the
tread;
2.6.2. "Radial" describes a 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 stabilized by an
essentially inextensible circumferential belt.
2.7. "Bead" means the part of a tyre which is of such shape and structure as to fit the rim and to
hold the tyre on it ;
2.8. "Cord" means the strands forming the fabric of the plies in the tyre ;
2.9. "Ply" means a layer of rubber-coated parallel cords ;
2.10. "Carcass" means that part of a tyre other than the tread and the rubber sidewalls which,
when inflated, bears the load ;
2.11. "Tread" means that part of a tyre which comes into contact with the ground, protects the
carcass against mechanical damage and contributes to ground adhesion ;
2.12. "Sidewall" means the part of a tyre between the tread and the area designed to be covered
by the rim flange ;
2.13. "Lower Sidewall" means the area included between the line of maximum section width of
the tyre and the area designed to be covered by the rim flange ;
2.13.1. However, in case of tyres identified by the "tyre to rim fitment configuration" (see
Paragraph 3.1.11.) Symbol "A", it means the area of the tyre which is seating on the rim.
2.14. "Tread Groove" means the space between two adjacent ribs and/or blocks in the tread
pattern ;

2.20.1.3.1. The values of the "d" symbols expressed in millimetres are shown below:
Nominal rim diameter code
("d" symbol)
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
24
25
14.5
16.5
17.5
19.5
20.5
22.5
24.5
26
28
30
Value of the "d" symbol
expressed in mm
203
229
254
279
305
330
356
381
406
432
457
483
508
533
559
610
635
368
419
445
495
521
572
622
660
711
762
2.20.1.4. An indication of the tyre to rim fitment configuration when it differs from the standard
configuration and is not already expressed by the Symbol "d" denoting the nominal rim
diameter code.
2.21. "Nominal rim diameter (d)" means the diameter of the rim on which a tyre is designed to
be mounted ;
2.22. "Rim" means the support for a tyre-and-tube assembly, or for a tubeless tyre, on which
support the tyre beads are seated ;
2.23. "Theoretical rim" means a 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 type;
2.24. "Measuring rim" means the rim on which a tyre must be fitted for dimensional
measurements;

2.32. "Table load-capacity variation with speed" means:
The table, in Annex 8, showing as a function of the load-capacity indices and
nominal-speed-category symbols the load variations which a tyre can withstand when used
at speeds different from that conforming to its nominal-speed-category symbol. The load
variations do not apply in the case of the additional load capacity symbol and speed
category obtained when the provisions of Paragraph 6.2.5. are applied.
2.33. "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;
2.34. "Tyre Class" means one of the following groupings:
2.34.1. Class C2 tyres: Tyres identified by a load capacity index in single formation lower or equal
to 121 and a speed category symbol higher or equal to "N";
2.34.2. Class C3 tyres: Tyres identified by:
(a)
(b)
A load capacity index in single formation higher or equal to 122; or
A load capacity index in single formation lower or equal to 121 and a speed category
symbol lower or equal to "M".
3. MARKINGS
3.1. Tyres submitted for approval shall bear on both sidewalls in the case of symmetrical tyres
and at least on the outer sidewall in the case of asymmetrical tyres:
3.1.1. The manufacturer's name or the Brand name/trademark;
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.
3.1.3. The tyre-size designation as defined in Paragraph 2.17. of this Regulation;
3.1.4. An indication of the structure as follows:
3.1.4.1. On diagonal (bias-ply) tyres: no indication, or the Letter "D";
3.1.4.2. On radial-ply tyres: the Letter "R" placed in front of the rim-diameter marking and, optionally,
the word "RADIAL";
3.1.5. The speed-category symbol (or symbols);
3.1.5.1. An indication of the tyre's nominal speed category in the form of the symbol prescribed in
Paragraph 2.28.2. above;
3.1.5.2. An indication of a second speed category in cases where Paragraph 6.2.5. below is applied;
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 2.2.2.

3.1.15. The suffix "CP" after the rim diameter marking referred to in Paragraph 2.17.1.3, and, if
applicable, after the tyre to rim fitment configuration referred to in Paragraph 2.17.1.4. This
marking is mandatory in the case of tyres fitted on 5° drop centre rims, having a load
capacity index in single lower or equal to 121 and specifically designed for the equipment of
motor caravans.
3.1.16. The inscription "FRT" (Free Rolling Tyre) in case of tyres designed for the equipment of
trailer axles and axles of motor vehicles other than front steering and drive axles.
3.2. Tyres shall exhibit a free space sufficiently large to accommodate an approval mark as
shown in Annex 2 to this Regulation.
3.3. Annex 3 to this Regulation gives an example of an arrangement 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 and shall, except for the marking referred to in Paragraph 3.1.1. above, be
located on at least one lower sidewall.
3.4.1. However, for tyres identified by the "tyre to rim fitment configuration" (see
Paragraph 3.1.11.) Symbol "A", the markings may be placed anywhere on the sidewall of
the tyre.
4. APPLICATION FOR APPROVAL
4.1. The application for approval of a type of tyre with regard to this Regulation shall be
submitted by the tyre manufacturer or by his duly accredited representative. It shall specify:
4.1.1. The tyre-size designation as defined in Paragraph 2.19. of this Regulation;
4.1.2. The manufacturer's name;
4.1.2.1. The Brand name(s)/trademark(s);
4.1.2.2. The trade description(s)/commercial name(s);
4.1.3. Category of use (normal tyre, snow tyre, special use tyre);
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.
4.1.4. Structure: diagonal (bias ply) or radial;
4.1.5. The speed category;
4.1.6. The load-capacity indexes;
4.1.7. Whether the tyre is intended to be used with or without an inner tube;
4.1.8. The overall dimensions: overall section width and outer diameter;
4.1.9. The factor "x" referred to in Paragraph 2.20. above;

5.6. Annex 2 to this Regulation gives an example of the arrangement of the approval mark.
5.7. Subsequent retreading in accordance with Regulation No. 109.
In the case where, during the course of production of a particular tyre type, the manufacturer
has obtained a new approval for that same tyre type to be marked with a service description
indicating a higher load index or different speed symbol than the earlier marking and where
the tyre manufacturer authorises the earlier tyre type to be retreaded and marked with the
later service description, the tyre manufacturer shall complete the Communication document
given in Annex 9 to this Regulation and shall submit this to the Type Approval Authority that
has granted the new approval. If the authorisation for upgrading only applies to tyres from a
particular manufacturing plant, or produced during particular production periods, the
information necessary to identify the tyres shall be stated on the Communication document.
The Type Approval Authority shall communicate this information to other Parties to the
Agreement which apply this Regulation and tyre manufacturers or Type Approval Authorities
shall release this information on the request of any retreading production unit that is
approved in accordance with Regulation No. 109.
6. SPECIFICATIONS
6.1. Dimensions of Tyres
6.1.1. Section Width of a Tyre
6.1.1.1. The section width shall be obtained by means of the following formula:
S = S + K(A - A ),
Where:
S
S
A
A
is the "section width" rounded to the nearest millimetre and measured on the
measuring rim;
is the "nominal section width" in millimetres, as shown on the sidewall of the tyre in
the tyre designation as prescribed;
is the width of the measuring rim in millimetres, as shown by the manufacturer in the
descriptive note; and
is the width of the theoretical rim in millimetres.
A shall be taken to equal S multiplied by the factor x as specified by the manufacturer, and
K shall be taken to equal 0.4.
6.1.1.2. However, for the existing types of tyres whose designation is given in the first column of the
tables in Annex 5 to this Regulation, the section width shall be deemed to be that given
opposite the tyre designation in those tables.
6.1.1.3. However, for tyres identified by the "tyre to rim fitment configuration" (see
Paragraph 3.1.11.) Symbol "A", K shall be taken to equal 0.6.

6.1.5. Tyre Outer Diameter Specifications
The outer diameter of a tyre must not be outside the values D
and D
obtained from the
following formulae:
D = d + 2 × H
D = d + 2 × H
Where:
H = H × a rounded to the nearest mm
H = H × b rounded to the nearest mm
and
6.1.5.1 For sizes listed in Annex 5 and for tyres identified by the "tyre to rim fitment configuration"
(see Paragraph 3.1.11.) Symbol "A", the nominal section height H is equal to:
H = 0.5 (D-d) rounded to the nearest mm – for references see Paragraph 6.1.2.1.
6.1.5.2 For other sizes, not listed in Annex 5
"H" and "d" are as defined in Paragraph 6.1.2.1.
6.1.5.3 Coefficients "a" and "b" are respectively:
6.1.5.3.1 Coefficient "a" = .97
6.1.5.3.2 Coefficient "b"
Radial
Diagonal
For normal use tyres
1.04
1.07
For special use tyres
1.06
1.09
6.1.5.3.3. For snow tyres the outer diameter shall not exceed the following value
D = 1.01 × D rounded to the nearest mm
Where D is the maximum outer diameter established in conformity with the above.
For tyres of the category of use "snow tyre" the outer diameter (D
conformity with the above may be exceeded by 1%.
) established in

7. MODIFICATION AND EXTENSION OF APPROVAL OF TYRE TYPE
7.1. Every modification of a tyre type shall be notified to the Type Approval Authority which
approved the tyre type. That Authority 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 tyre still meets the requirements; or
7.1.2. Require a further test report from the Technical Service responsible for carrying out the
tests.
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.
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.
7.4. The competent Type Approval 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.
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 Type Approval 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 two years.
9. PENALTIES FOR NON-CONFORMITY OF PRODUCTION
9.1. The approval granted in respect of a type of tyre pursuant to this Regulation may be
withdrawn if the requirement laid down in Paragraph 8.1. above is 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 which applies 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 DEFINITIVELY DISCONTINUED
If the holder of an approval completely ceases to manufacture a type of tyre approved in
accordance with this Regulation, he shall so inform the Type Approval Authority which
granted the approval. Upon receiving the relevant communication that Authority shall inform
thereof the other Parties to the 1958 Agreement applying this Regulation by means of
copies of the communication form conforming to the model in Annex 1 to this Regulation.

ANNEX 1
COMMUNICATION
(Maximum format: A4 (210 × 297mm) )
issued by: Name of administration
.........................................................
.........................................................
.........................................................
concerning:
Approval granted
Approval extended
Approval refused
Approval withdrawn
Production definitively discontinued
of a type of tyre for motor vehicles pursuant to Regulation No. 54
Approval No. .................................................. Extension No. ................................
1. Manufacturer's name and address: ...........................................................................................
2. Tyre type designation ..............................................................................................................
2.1. Brand name(s)/trademark(s): .....................................................................................................
2.2. Trade description(s)/ Commercial name(s)/ ..............................................................................
3. If applicable, name and address of manufacturer's representative ...........................................
...................................................................................................................................................
4. Summarised description:
4.1. Size of tyre: ................................................................................................................................
4.2. Category of use: normal/special/snow
4.3. Structure: diagonal (bias-ply)/radial
4.4. Tyre class: C2 / C3

ANNEX 2
ARRANGEMENT OF APPROVAL MARK
a = 12mm (min.)
The above approval mark affixed to a tyre shows that the type of tyre concerned has been approved in
the Netherlands (E 4) under approval number 002439. The first two digits of the approval number
indicate that the approval was granted in accordance with the requirements of Regulation No. 54 in its
original form.
Note: 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.

Capable of being fitted without inner tube: "TUBELESS"
Manufactured during the twenty-fifth week of the year 2003; and
Requiring to be inflated to 620 kPa for load/speed endurance tests, for which the
PSI symbol is 90.
2. In the particular case of tyres having a tyre to rim fitment configuration "A", the marking shall
be in the from of the following example:
235-700 R 450A
Where:
235 is the nominal section width in mm
700 is the outer diameter expressed in mm
R is an indication of the structure of the tyre - see Paragraph 3.1.3 of this Regulation
450 is the nominal diameter of the rim expressed in mm
A is the tyre to rim fitment configuration.
The marking of the load index, speed category symbol, date of manufacture and other
markings, shall be as given in Example above.
3. The positioning and order of the markings constituting the tyre designation shall be the
following:
(a)
(b)
(c)
(d)
The tyre-size designation as defined in Paragraph 2.17 of this Regulation shall be
grouped as shown in the example above: 255/70 R 22.5 or 235-700 R 450A;
The service description comprising the load index/indices and the speed symbol shall
be placed immediately after the tyre size designation as defined in Paragraph 2.17 of
this Regulation;
The symbol "TUBELESS" and "M+S" or "FRT" or "MPT" (and equivalents) may be at
a distance from the tyre size designation.
If Paragraph 6.2.5. of this Regulation is applied, the additional load-capacity indices
and speed-category symbol must be shown inside a circle near the nominal
load-capacity indices and speed-category-symbol appearing on the tyre sidewall.

Load-capacity index
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
Corresponding maximum
mass to be carried (kg)
800
825
850
875
900
925
950
975
1 000
1 030
1 060
1 090
1 120
1 150
1 180
1 215
1 250
1 285
1 320
1 360
1 400
1 450
1 500
1 550
1 600
1 650
1 700
1 750
1 800
1 850
1 900
1 950
2 000
2 060
2 120
2 180
2 240
2 300
2 360
2 430

Load-capacity index
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
Corresponding maximum
mass to be carried (kg)
8 000
8 250
8 500
8 750
9 000
9 250
9 500
9 750
10 000
10 300
10 600
10 900
11 200
11 500
11 800
12 150
12 500
12 850
13 200
13 600
14 000

Table A - (Cont'd)
Tyre Size
Designation
Std. series
8.25R15
8.25R16
8.25R17
8.25R20
9.00R15
9.00R16
9.00R20
10.00R15
10.00R20
10.00R22
11.00R16
11.00R20
11.00R22
11.00R24
12.00R20
12.00R22
12.00R24
13.00R20
14.00R20
14.00R24
16.00R20
80 Series
12/80 R 20
13/80 R 20
14/80 R 20
14/80 R 24
14.75/80 R 20
15.5/80 R 20
Measuring
Rim Width
Code
6.50
6.50
6.50
6.50
6.00
6.50
7.00
7.50
7.50
7.50
6.50
8.00
8.00
8.00
8.50
8.50
8.50
9.00
10.00
10.00
13.00
8.50
9.00
10.00
10.00
10.00
10.00
Wide Base Tyres for Multipurpose Trucks
Nominal Rim
Diameter
d (mm)
381
406
432
508
381
406
508
381
508
559
406
508
559
610
508
559
610
508
508
610
508
508
508
508
610
508
508
Outer Diameter
D (mm)
Section Width
S (mm)
Radial Diagonal Radial Diagonal
836
860
886
962
840
912
1018
918
1052
1102
980
1082
1132
1182
1122
1174
1226
1176
1238
1340
1370
1008
1048
1090
1192
1124
1158
836
860
895
970
840
900
1012
918
1050
1102
952
1080
1130
1180
1120
1174
1220
1170
1238
1340
1370






230
230
230
230
249
246
258
275
275
275
279
286
286
286
313
313
313
336
370
370
446
305
326
350
350
370
384
234
234
234
234
249
252
256
275
275
275
272
291
291
291
312
312
312
342
375
375
446






7.50 R 18 MPT
10.5 R 18 MPT
10.5 R 20 MPT
12.5 R 18 MPT
12.5 R 20 MPT
14.5 R 20 MPT
14.5 R 24 MPT
5.50
9
9
11
11
11
11
457
457
508
457
508
508
610
885
905
955
990
1040
1095
1195
276
276
330
330
362
362
208
270
270
325
325
355
355

Table C
Tyres for Light Commercial Vehicles – Radial and Diagonal Constructions
Tyre Size
Designation
Measuring
Rim Width
Code
Nominal Rim
Diameter
d (mm)
Outer Diameter
D (mm)
Section Width
S (mm)
Radial Diagonal Radial Diagonal
Metric Designated
145 R 10 C
145 R 12 C
145 R 13 C
145 R 14 C
145 R 15 C
155 R 12 C
155 R 13 C
155 R 14 C
165 R 13 C
165 R 14 C
165 R 15 C
175 R 13 C
175 R 14 C
175 R 16 C
185 R 13 C
185 R 14 C
185 R 15 C
185 R 16 C
195 R 14 C
195 R 15 C
195 R 16 C
205 R 14 C
205 R 15 C
205 R 16 C
215 R 14 C
215 R 15 C
215 R 16 C
245 R 16 C
4.00
4.00
4.00
4.00
4.00
4.50
4.50
4.50
4.50
4.50
4.50
5.00
5.00
5.00
5.50
5.50
5.50
5.50
5.50
5.50
5.50
6.00
6.00
6.00
6.00
6.00
6.00
7.00
254
305
330
356
381
305
330
356
330
356
381
330
356
406
330
356
381
406
356
381
406
356
381
406
356
381
406
406
492
542
566
590
616
550
578
604
596
622
646
608
634
684
624
650
674
700
666
690
716
686
710
736
700
724
750
798



























798
147
147
147
147
147
157
157
157
167
167
167
178
178
178
188
188
188
188
198
198
198
208
208
208
218
218
218
248



























248
17 R 15 C
17 R 380 C
17 R 400 C
19 R 400 C
5.00
5.00
150mm
150mm
381
381
400
400
678
678
698
728




178
178
186
200




Code Designated
5.60 R 12 C
6.40 R 13 C
6.70 R 13 C
6.70 R 14 C
6.70 R 15 C
4.00
5.00
5.00
5.00
5.00
305
330
330
356
381
570
648
660
688
712
572
640
662
688
714
150
172
180
180
180
148
172
180
180
180

PART II
UNITED STATES TYRES
− Tolerances shown at the bottom of the tables apply in place of those shown in Paragraphs 6.1.4.2.
and 6.1.5.3.

Outer diameters are listed for the various categories of use: Normal, Snow, Special.
Table A
Tyres for Light Commercial Vehicles (LT Tyres) – Diagonal and Radial
Tyre size
designation
Measuring
rim width
code
Nominal rim
diameter d
(mm)
Outer diameter
D (mm) Section width
S (mm)
Normal Snow
6.00-16LT
6.50-16LT
6.70-16LT
7.00-13LT
7.00-14LT
7.00-15LT
7.00-16LT
7.10-15LT
7.50-15LT
7.50-16LT
8.25-16LT
9.00-16LT
4.50
4.50
5.00
5.00
5.00
5.50
5.50
5.00
6.00
6.00
6.50
6.50
406
406
406
330
356
381
406
381
381
406
406
406
732
755
722
647
670
752
778
738
782
808
859
890
743
767
733
658
681
763
788
749
794
819
869
903
173
182
191
187
187
202
202
199
220
220
241
257
G78-15LT
H78-15LT
L78-15LT
L78-16LT
6.00
6.00
6.50
6.50
381
381
381
406
711
727
749
775
722
739
760
786
212
222
236
236
7-14.5LT
8-14.5LT
9-14.5LT
7-17.5LT
8-17.5LT
6.00
6.00
7.00
5.25
5.25
368
368
368
445
445
677
707
711
758
788
769
799
185
203
241
189
199

Tyre-size
designation
Measuring
rim width
code
Table B - (Cont'd)
Nominal rim
diameter
d (mm)
Outer diameter
D (mm)
Section with
S (mm)
35×11.50R20LT
9.00
508
877
883
290
35×12.50-15LT
10.00
381
877
883
318
35×12.50R17LT
10.00
432
877
883
318
35×12.50R18LT
10.00
457
877
883
318
35×12.50R20LT
10.00
508
877
883
318
35×12.50R22LT
10.00
559
877
883
318
35×13.50R15LT
11.00
381
877
883
345
35×13.50R18LT
11.00
457
877
883
345
35×13.50R20LT
11.00
508
877
883
345
35×14.50R15LT
12.00
381
877
883
372
36×13.50R18LT
11.00
457
902
908
345
36×14.50R15LT
12.00
381
902
908
372
36×14.50R17LT
12.00
432
902
908
372
36×14.50R18LT
12.00
457
902
908
372
36×15.50R15LT
12.00
381
902
908
390
37×11.50R20LT
9.00
508
928
934
290
37×12.50-15LT
10.00
381
928
934
318
37×12.50R17LT
10.00
432
928
934
318
37×12.50R18LT
10.00
457
928
934
318
37×12.50R20LT
10.00
508
928
934
318
37×12.50R22LT
10.00
559
928
934
318
37×13.50R15LT
11.00
381
928
934
345
37×13.50R17LT
11.00
432
928
934
345
37×13.50R18LT
11.00
457
928
934
345
37×13.50R20LT
11.00
508
928
934
345
37×13.50R22LT
11.00
559
928
934
345
37×13.50R24LT
11.00
610
928
934
345
37×14.50-15LT
12.00
381
928
934
372
38×13.50R17LT
11.00
432
953
959
345
38×13.50R20LT
11.00
508
953
959
345
38×13.50R22LT
11.00
559
953
959
345
38×13.50R24LT
11.00
610
953
959
345
38×14.50R17LT
12.00
432
953
959
372

Table C
Code Designated Tyres Mounted on 5° Tapered or Flat Base Rims – Diagonal and Radial
Tyre size
designation
Measuring
rim width
code
Nominal rim
diameter d
(mm)
(a)
Outer diameter
D (mm) Section
width S
Normal
Snow (mm)
(b)
6.50-20
7.00-15TR
7.00-18
7.00-20
7.50-15TR
7.50-17
7.50-18
7.50-20
8.25-15TR
8.25-20
9.00-15TR
9.00-20
10.00-15TR
10.00-20
10.00-22
11.00-20
11.00-22
11.00-24
11.50-20
12.00-20
12.00-24
14.00-20
14.00-24
5
5.5
5.5
5.5
6
6
6
6
6.5
6.5
7
7
7.5
7.5
7.5
8
8
8
8
8.5
8.5
10
10
508
381
457
508
381
432
457
508
381
508
381
508
381
508
559
508
559
610
508
508
610
508
610
878
777
853
904
808
859
884
935
847
974
891
1019
927
1054
1104
1085
1135
1186
1085
1125
1226
1241
1343
855
982
904
1031
940
1067
1118
1099
1150
1201
1099
893
792
868
919
825
876
901
952
865
992
911
1038
946
1073
1123
1104
1155
1206
1104
1146
1247
1266
1368
184
199
199
199
215
215
215
215
236
236
259
259
278
278
278
293
293
293
296
315
315
375
375

Table E
Code Designated Tyres Mounted on 15° Tapered Rims – Diagonal and Radial
Tyre size
designation
Measuring
rim width
code
Nominal rim
diameter d
(mm)
Outer diameter
D (mm)
Section
Normal
width S
(mm)
(a)
(b)
Snow
8-19.5
8-22.5
9-22.5
10-22.5
11-22.5
11-24.5
12-22.5
12-24.5
12.5-22.5
12.5-24.5
6.00
6.00
6.75
7.50
8.25
8.25
9.00
9.00
9.00
9.00
495
572
572
572
572
622
572
622
572
622
859
935
974
1019
1054
1104
1085
1135
1085
1135
982
1031
1067
1118
1099
1150
1099
1150
876
952
992
1038
1073
1123
1104
1155
1104
1155
203
203
229
254
279
279
300
300
302
302
14-17.5
15-19.5
15-22.5
16.5-22.5
18-19.5
18-22.5
10.50
11.75
11.75
13.00
14.00
14.00
445
495
572
572
495
572
907
1005
1082
1128
1080
1158
921
1019
1095
1144
1096
1172
349 (-)
389 (-)
389 (-)
425 (-)
457 (-)
457 (-)

ANNEX 7
PROCEDURE FOR LOAD/SPEED ENDURANCE TESTS
1. PREPARING THE TYRE
1.1. Mount a new tyre on the test rim specified by the manufacturer pursuant to
Paragraph 4.1.11. of this Regulation.
1.2. Use a new inner tube or combination of inner tube, valve and flap (as required) when testing
tyres with inner tubes.
1.3. Inflate the tyre to the pressure corresponding to the pressure specified by the manufacturer
pursuant to Paragraph 4.1.12. of this Regulation.
1.4. Condition the tyre-and-wheel assembly at test-room temperature for not less than 3h.
1.5. Readjust the tyre pressure to that specified in Paragraph 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 power-driven test drum 1.70 m ± 1% in diameter having a surface at least as wide
as the tyre tread.
2.2. Apply to the test axle a series of test loads expressed in per cent of the load indicated, in
Annex 4 to this Regulation, opposite the load index engraved on the sidewall of the tyre, in
accordance with the test programme below. Where the tyre has load-capacity indices for
both single and twinned utilisation, the reference load for single utilisation shall be taken as
the basis for the test loads.
2.2.1. In the case of tyres with a speed category above P, test procedures are as specified in
Paragraph 3.
2.2.2. For all other tyre types, the endurance test programme is shown in Appendix 1 to this
Annex.
2.3. The tyre pressure must not be corrected throughout the test and the test load must be kept
constant throughout each of the three test stages.
2.4. 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 manufacturer so agrees.
2.5. The endurance-test programme shall be carried out without interruption.

ANNEX 7 − APPENDIX 1
ENDURANCE-TEST PROGRAMME
Load index
Tyre speed
Category
Symbol
Test-drum speed
Radial-ply
km.h
Diagonal
(bias-ply)
km.h
Load placed on the wheel as a percentage
of the load corresponding to the load index
7h. 16h. 24h.
122 or more F
G
J
K
L
M
121 or less F
G
J
K
32
40
48
56
64
72
32
40
48
56
32
32
40
48


66%
84%
101%
32
40
48
56
L 64 56
70% 88% 106%
4h. 6h.
M
N
P
80
88
96
64


75%
75%
75%
97%
97%
97%
114%
114%
114%
Notes:
(1)
"Special-use" tyres (see Paragraph 2.1.3. of this Regulation) should be tested at a speed
equal to 85% of the speed prescribed for equivalent normal tyres.
(2) Tyres with Load Index of 122 or more, speed Categories N or P and the additional
marking "LT", or "C", referred to in Paragraph 3.1.13 of this Regulation, shall be tested
with the same programme as specified in the above table for tyres with Load Index 121
or less.

ANNEX 8
VARIATION OF LOAD CAPACITY WITH SPEED COMMERCIAL VEHICLES TYRES
RADIAL AND DIAGONAL
(see Paragraphs 2.27. and 2.29.)
Speed
(km/h)
Variation of load capacity (%)
All load indices
Load indices ≥ 122
Load indices ≤ 121
Speed category symbol
Speed category
symbol
Speed category symbol
F
G
J
K
L
M
L
M
N
P

4.2. Upgraded tyre: ................................................................................................................................
Approval No. pursuant to Regulation No. 54. ................................................................................
........................................................................................................................................................
Granted by: .....................................................................................................................................
........................................................................................................................................................
5. Authorised by (tyre manufacturer's representative):
5.1. Name (Block capitals): ...................................................................................................................
........................................................................................................................................................
5.2. Department: ....................................................................................................................................
........................................................................................................................................................
5.3. Signature: .......................................................................................................................................
........................................................................................................................................................
Tyres - Commercial Vehicles.