Transport Canada Transports Canada  
Safety and Security Sécurité et sûreté 
 
Road Safety  Sécurité routière 
   
Standards and Regulations Division  
 
 
TECHNICAL STANDARDS DOCUMENT 
No. 139, Revision 0 
 
 
New Radial Ply Tires 
for Motor  
Vehicles With a GVWR of  
4,536 kg or Less 
 
  
The text of this document is based  on Federal Motor Vehicle Safety 
Standard No. 139, New pneumatic radial tires for light vehicles , as 
published in the U.S. Code of Federal Regulations , Title 49, 
Part 571, revised as of October 1, 2009.  
 
 
Publication Date:  November 20, 2013 
Effective Date:  November 20, 2013 Mandatory Compliance Date:   May 20, 2014 
 
 
  
Motor Vehicle Standards, Research and Development Branch 
Road Safety and Motor Vehicle Regulation Directorate 
TRANSPORT CANADA 
Ottawa, Ontario 
K1A 0N5   
 Technical Standards Document 
Number 139, Revision 0 
New Radial Ply Tires for Motor Vehicles With  
a GVWR of 4 536 kg or Less 
(Ce document est aussi disponible en français.) 
Introduction 
As defined by section 12 of the Motor Vehicle Safety Act , a Technical Standards Document 
(TSD) is a document that reproduces an enactment of a foreign government (e.g. a Federal Motor Vehicle Safety Standard issued by the U.S. National Highway Traffic Safety 
Administration).  According to the Act, the Motor Vehicle Tire Safety Regulations  may alter 
or override some provisions contained in a TSD or specify additional requirements; 
consequently, it is advisable to read a TSD in conjunction with the Act and the Motor 
Vehicle Tire Safety Regulations .  As a guide, where the corresponding Regulation contains 
additional requirements, footnotes indicate the amending subsection number.  TSDs are revised from time to time in order to incorporate amendments made to the reference document, at which time a Notice of Revision is published in the Canada Gazette , 
Part I.  All TSDs are assigned a revision number, with “Revision 0” designating the original version. 
 
Identification of Changes 
In order to facilitate the incorporation of a TSD, certain non-technical changes may be made 
to the foreign enactment.  These may include the deletion of words, phrases, figures, or sections that do not apply under the Act or Regulations, the conversion of imperial to metric units, the deletion of superseded dates, and minor changes of an editorial nature.  Additions are underlined
, and provisions that do not apply are stroked through .  Where an entire section 
has been deleted, it is replaced by: “[CONTENT DELETED]”.  Changes are also made where there is a reporting requirement or reference in the foreign enactment that does not apply in Canada.  For example, the name and address of the United States Department of Transportation are replaced by those of the Department of Transport.  
Effective Date and Mandatory Compliance Date 
The effective date of a TSD is the date of publi cation of its incorporating regulation or of the 
notice of revision in the Canada Gazette , and the date as of which voluntary compliance is 
permitted.  The mandatory compliance date is the date upon which compliance with the requirements of the TSD is obligatory.  If the effective date and mandatory compliance date are different, manufacturers may follow the requirements that were in force before the effective date, or those of the TSD, until the mandatory compliance date.  In the case of an initial TSD, or when a TSD is revised and incorporated by reference by an amendment to the Regulations, the mandatory compliance date is as specified in the Regulations, and it may be the same as the effective date.  When a TSD is revised with no New Radial Ply Tires for   
Motor Vehicles With a GVWR of 4 536 kg or Less TSD No. 139, Revision 0  
Effective: November 20, 2013  ii corresponding changes to the incorporating Regulations, the mandatory compliance date is 
six months after the effective date. 
Official Version of Technical Standards Documents 
The PDF version is a replica of the TSD as published by the Department and is to be used for 
the purposes of legal interpretation and application.   
 
 
(Original signed by) 
  
Director, Motor Vehicle Standards, 
 Research and Development 
 for the Minister of Transport, 
Ottawa, Ontario New Radial Ply Tires for   
Motor Vehicles With a GVWR of 4 536 kg or Less TSD No. 139, Revision 0  
Effective: November 20, 2013  iii TABLE OF CONTENTS 
 
Technical Standards Document 
Number 139, Revision 0 
 
NEW RADIAL PLY TIRES FOR MOTOR VEHICLES  
WITH A GVWR OF 4 536 KG OR LESS 
 
Introduction _______________________________________________________________ i  
S1.  Scope and purpose ______________________________________________________1  
S2.  Application and incorporation by reference __________________________________1  
S3.  Definitions _____________________________________________________________1  
S4.  Tire and rim matching information _________________________________________4  
S5.  General requirements ____________________________________________________4  
S5.1  Size and constructi on ________________________________________________________ 4  
S5.2  Performan ce requiremen ts ____________________________________________________ 4  
S5.3  Test sample ________________________________________________________________ 4  
S5.4  Treadwea r indica tors ________________________________________________________ 5  
S5.5 Tire ma rkings _______________________________________________________________ 5  
S6.  Test procedures, conditions and performance requirements _____________________7  
S6.1  Tire di mensions _____________________________________________________________ 7  
S6.2  High speed  performa nce ______________________________________________________ 9  
S6.3  Tire endurance ____________________________________________________________ 10  
S6.4  Low inflation pressure perfor mance ___________________________________________ 12  
S6.5  Tire strength ______________________________________________________________ 13  
S6.6  Tubeless tire bead  unseating resistan ce _________________________________________ 14  
S7.  Phase-in schedule for tire markings _______________________________________14  
   
 Technical Standards Document 
Number 139, Revision 0 
NEW RADIAL PLY TIRES FOR MOTOR VEHICLES  
WITH A GVWR OF 4 536 KG OR LESS 
The text of this document is based on Federal Motor Vehicle Safety 
Standard No. 139, New pneumatic radial tires for light vehicles , as 
published in the U.S. Code of Federal Regulations , Title 49, Part 571, 
revised as of October 1, 2009.  
S1.  Scope and purpose 
This Technical Standards Document (TSD)  standard  specifies tire dimensions, test 
requirements, labeling requirements, and defines tire load ratings. 
S2.  Application and incorporation by reference 
[CONTENT DELETED]  For applicability, please see subsection 5(1) of the Motor Vehicle 
Tire Safety Regulations . 
S3.  Definitions 
1 Bead means the part of the tire that is made of steel wires, wrapped or reinforced by ply 
cords and that is shaped to fit the rim.   (Talon) 
Bead separation means a breakdown of the bond between components in the bead.  
(Séparation du talon) 
1 Bias ply tire means a pneumatic tire in which the ply cords that extend to the beads are laid 
at alternate angles substantially less than 90  degrees to the centerline of the tread.   (Pneu à 
carcasse diagonale) 
Carcass  means the tire structure, except tread and sidewall rubber which, when inflated, 
bears the load.  (Carcasse) 
Chunking means the breaking away of pieces of the tread or sidewall.  (Arrachement) 
Cord  means the strands forming the plies in the tire.  (Câblé) 
Cord separation means the parting of cords from adjacent rubber compounds.  (Séparation 
de câblés) 
                                                 
1  Please see subsection 1(1) of the Motor Vehicle Tire Safety Regulations  (MVTSR) for the applicable 
definition.  New Radial Ply Tires for   
Motor Vehicles With a GVWR of 4 536 kg or Less TSD No. 139, Revision 0  
Effective: November 20, 2013   2 Cracking means any parting within the tread, sidewall, or innerliner of the tire extending to 
cord material.  (Fissuration) 
Extra load tire means a tire designed to operate at higher loads and higher inflation pressure 
than the corresponding standard tire.  (Pneu à charge supplémentaire) 
Groove means the space between two adjacent tread ribs.  (Sillon)  
Innerliner means the layer(s) forming the inside surface of a tubeless tire that contains the 
inflating medium within the tire.  (Calandrage intérieur) 
Innerliner separation means the parting of the innerliner from cord material in the carcass.  
(Séparation du calandrage intérieur) 
2 Light-truck tire or LT tire  Light truck (LT) tire  means a tire designated by its 
manufacturer as primarily intended for use on lightweight trucks or multipurpose passenger 
vehicles.   (Pneu pour camion léger)  
3 Load rating means the maximum load that a tire is rated to carry for a given inflation 
pressure.   (Charge nominale) 
3 Maximum load rating means the load rating for a tire at the maximum permissible 
inflation pressure for that tire.   (Limite de charge nominale) 
3 Maximum permissible inflation pressure means the maximum cold inflation pressure to 
which a tire may be inflated.   (Pression maximale permise de gonflage) 
Measuring rim means the rim on which a tire is fitted for physical dimension requirements.  
(Jante de mesure)  
Open splice means any parting at any junction of tread, sidewall, or innerliner that extends 
to cord material.  (Séparation de soudure) 
Outer diameter means the overall diameter of an inflated new tire.  (Diamètre extérieur)  
Overall width means the linear distance between the exteriors of the sidewalls of an inflated 
tire, including elevations due to labeling, decoration, or protective bands or ribs.  (Largeur 
hors tout) 
2 Passenger car tire means a tire intended for use on passenger cars, multi -purpose 
passenger vehicles, and trucks that have a gross vehicle weight rating (GVWR) of 4 536 kg 
(10 000 lb.) or less.   (Pneu pour voiture de tourisme)  
 
                                                 
2 Please see subsection 2(1) of the Motor Vehicle Safety Regulations  (MVSR) for the applicable definition.  
3 Please see subsection 1(1) of the MVTSR for the applicable definition.  New Radial Ply Tires for   
Motor Vehicles With a GVWR of 4 536 kg or Less TSD No. 139, Revision 0  
Effective: November 20, 2013   3 4 Ply means a layer of rubber -coated parallel cords.   (Pli) 
Ply separation  means a parting of rubber compound between adjacent plies.  (Décollement 
entre nappes) 
Tire Pneumatic  tire means a mechanical device made of rubber, chemicals, fabric and steel 
or other materials, that, when mounted on an automotive wheel, provides the traction and contains the gas or fluid that sustains the load.  (Pneu) 
4 Radial ply tire means a pneumatic tire in which the ply cords that extend to the beads are 
laid at subst antially 90 degrees to the centerline of the tread.   (Pneu à carcasse radiale) 
Reinforced tire means a tire designed to operate at higher loads and at higher inflation 
pressures than the corresponding standard tire.  (Pneu renforcé)  
4 Rim means a metal sup port for a tire or a tire and tube assembly upon which the tire beads 
are seated.  (Jante) 
Section width means the linear distance between the exteriors of the sidewalls of an inflated 
tire, excluding elevations due to labeling, decoration, or protective bands.  (Grosseur du 
boudin) 
4 Sidewall means that portion of a tire between the tread and bead.   (Flanc) 
Sidewall separation means the parting of the rubber compound from the cord material in the 
sidewall.  (Séparation des flancs) 
5 Winter tire  Snow tire means a tire that attains a traction index equal to or greater than  110, 
compared to the ASTM  E-1136 Standard Reference Test Tire when using the snow traction 
test as described in ASTM  F-1805 -00, Standard Test Method for Single Wheel Driving 
Traction in a S traight Line on Snow - and Ice -Covered Surfaces , and which is marked with an 
Alpine Symbol specified in S5.5(i) on at least one sidewall .  (Pneu d’hiver)  
Test rim means the rim on which a tire is fitted for testing, which may be any rim listed as 
appropriate for use with that tire.  (Jante d’essai) 
4 Tread  means that portion of a tire that comes into contact with the road.   (Bande de 
roulement) 
Tread rib means a tread section running circumferentially around a tire.  (Nervure de la 
bande de roulement) 
Tread separation means pulling away of the tread from the tire carcass.  (Séparation de la 
bande de roulement) 
                                                 
4 Please see subsection 1(1) of the MVTSR for the applicable definition.  
5 Please see subsection 5(4) of the MVTSR for the applicable definition.  New Radial Ply Tires for   
Motor Vehicles With a GVWR of 4 536 kg or Less TSD No. 139, Revision 0  
Effective: November 20, 2013   4 Treadwear indicators (TWI) means the projections within the principal grooves designed to 
give a visual indication of the degrees of wear of the tread.  (Indicateurs d’usure)  
Wheel-holding fixture means the fixture used to hold the wheel and tire assembly securely 
during testing.  (Appareil de soutien de la roue)  
S4.  Tire and rim matching information 
[CONTENT DELETED]  Please see section 8 of the Motor Vehicle Tire Safety Regulations  
(MVTSR) for the applicable requirements.  
S5.  General requirements 
S5.1  Size and construction 
Each tire shall fit each rim specified for its size designation in accordance with sub-
section 8(1) of the MVTSR  S4.1 . 
S5.2  Performance requirements 
Each tire shall conform to each of the following: 
(a) It shall meet the requirements specified in S6 for its tire size designation, type, and 
maximum permissible inflation pressure. 
(b) It shall meet each of the applicable requirements set forth in paragraphs (c) and (d) of 
this S5.2 when mounted on a model rim assembly corresponding to any rim designated by the tire manufacturer for use with the tire in accordance with subsection 8(1) of the MVTSR
 S4. 
(c) Its maximum permissible inflation pressure shall be 240, 280, 300, 340, or 350 kPa. (d) Its load rating shall be that specified either in a submission made by an individual 
manufacturer, pursuant to subsection 8(1) of the MVTSR
 S4, or in one of the 
publications described in subsection 8(2) of the MVTSR  S4 for its size designation, 
type, and each appropriate inflation pressure. If the maximum load rating for a particular tire size is shown in more than one of the publications described in subsection 8(2) of the MVTSR
 S4, each tire of that size designation shall have a 
maximum load rating that is not less than the published maximum load rating, or if there are differing maximum load ratings for the same tire size designation, not less than the lowest published maximum load rating. 
S5.3  Test sample 
For the tests specified in S6, use: 
(a) One tire for high speed; (b) Another tire for endurance and low inflation pressure performance; and New Radial Ply Tires for   
Motor Vehicles With a GVWR of 4 536 kg or Less TSD No. 139, Revision 0  
Effective: November 20, 2013   5 (c) A third tire for physical dimensions, resistance to bead unseating, and strength, in 
sequence. 
S5.4  Treadwear indicators 
Except in the case of tires with a 305 mm (12-inch) or smaller rim diameter, each tire shall 
have not less than six treadwear indicators spaced approximately equally around the circumference of the tire that enable a person inspecting the tire to determine visually whether the tire has worn to a tread depth of 1.6 mm
 (one-sixteenth of an inch). Tires with a 
305 mm (12-inch) or smaller rim diameter shall have not less than three such treadwear 
indicators. 
S5.5 Tire markings 
Except as specified in paragraphs (a) through (i) of S5.5, each tire must be marked on each 
sidewall with the information specified in S5.5(a) through (d) and on one sidewall with the information specified in S5.5(e) through (i) according to the phase
-in schedule specif ied 
in S7 of this standard . The markings must be placed between the maximum section width and 
the bead on at least one sidewall, unless the maximum section width of the tire is located in an area that is not more than one-fourth of th e distance from the bead to the shoulder of the 
tire. If the maximum section width falls within that area, those markings must appear between the bead and a point one-half the distance from the bead to the shoulder of the tire, on at least one sidewall. The markings must be in letters and numerals not less than 2 mm
 
(0.078 inches) high and raised above or sunk below the tire surface not less than 0.4 mm  
(0.015 inch). 
(a) The symbol DOT, which constitutes a certification that the tire conforms to applicable 
Federal motor vehicle safety standards;  6 
(b) The tire size designation as listed in the documents and publications specified in 
section 8 of the MVTSR  S4.1.1 of this standard ; 
(c) The maximum permissible inflation pressure, subject to the limitations of S5.5.4 
through S5.5.6 of this TSD  standard ;7 
(d) The maximum load rating8 and for LT tires, the letter designating the tire load range; 
(e) The generic name of each cord material used in the plies (both sidewall and tread area) 
of the tire; 
(f) The actual number of plies in the sidewall and the actual number of plies in the tread 
area, if different; 
(g) The term “tubeless” or “tube type,” as applicable;  (h) The word “radial,” if the tire is a radial ply tire; and 
                                                
 
6 Please see section 7 of the MVTSR for the applicable requirements.  
7 Please see subsection 5(2) of the MVTSR for additional requirements.  
8 Please see subsection 5(3) of the MVTSR for additional requirements.  New Radial Ply Tires for   
Motor Vehicles With a GVWR of 4 536 kg or Less TSD No. 139, Revision 0  
Effective: November 20, 2013   6 (i) Alpine Symbol. A tire meeting the definition of a winter tire  snow tire , as defined in 
paragraph S3 may, at the option of the manufacturer, show the pictograph of a mountain with a snowflake as shown below. If the manufacturer chooses to mark the winter tire
 snow tire  with the alpine symbol, the mountain profile must have a 
minimum base of 15 mm and a minimum height of 15 mm, and must contain three peaks with the middle peak being the tallest. Inside the mountain, there must be a six-sided snowflake having a minimum height of one-half the tallest peak. 
 
S5.5.1 Tire identification number 
(a) Tires manufactured before September 1, 2009 . Each tire must be labeled with the tire 
identification number required by 49  CFR part  574 on a sidewall of the tire. Except 
for retreaded tires, either the tire identification number or a partial tire identification 
number, containing all characters in the tire identification number, except for the date 
code and, at the discretion of the manufacturer, any optional code, must be labeled on 
the other sidewall of the tire.  
(b) Tires manufact ured on or after September 1, 2009 . Each tire must be labeled with the 
tire identification number required by section 6 of the MVTSR  49 CFR part  574 on 
the intended outboard sidewall of the tire. Except for retreaded tires, either  Either  the 
tire identification number or a partial tire identification number, containing all characters in the tire identification number, except for the date code and, at the discretion of the manufacturer, any optional code, must be labeled on the other sidewall of the tire. Ex
cept for retreaded tires, if  If a tire does not have an intended 
outboard sidewall, the tire must be labeled with the tire identification number required by section 6 of the  MVTSR
 49 CFR part  574 on one sidewall and with either the tire 
identification number or a partial tire identification number, containing all characters in the tire identification number, except for the date code and, at the discretion of the manufacturer, any optional code, on the other sidewall. 
S5.5.2   [Reserved] 
S5.5.3   Each tire must be labeled with the name of the manufacturer, or brand name and 
number assigned to the manufacturer in the manner specified in section 6 of the  MVTSR
 
49 CFR part  574. 
S5.5.4   For passenger car tires, if the maximum inflation pressure of a tire is  240, 28 0, 300, 
340, or  350, then:  
(a) Each marking of that inflation pressure pursuant to S5.5(c) must be followed in 
parenthesis by the equivalent psi, rounded to the next higher whole number; and  New Radial Ply Tires for   
Motor Vehicles With a GVWR of 4 536 kg or Less TSD No. 139, Revision 0  
Effective: November 20, 2013   7 (b) Each marking of the tire’s maximum load rating pursuant to S5 .5(d) in kilograms must 
be followed in parenthesis by the equivalent load rating in pounds, rounded to the 
nearest whole number.  
S5.5.5   If the maximum inflation pressure of a tire is 420 kPa (60 psi), the tire must have 
permanently moulded into or onto both sidewalls, in letters and numerals not less than 12.7 mm
 (½ inch) high, the words “Inflate to 60 psi” or “Inflate to 420 kPa (60 psi)”. On 
both sidewalls, the words must be positioned in an area between the tire shoulder and the bead of the tire. However, the words must be also positioned on the tire so that they are not obstructed by the flange of any rim designated for use with that tire in this TSD or in 
TSD 110  standard or in Standard No.  110 (Sec.  571.110 of this part) . 
S5.5.6   For LT tires, the maximum permissible inflation pressure shown must be the inflation 
pressure that corresponds to the maximum load of the tire for the tire size as specified in one of the publications described in subsection 8(2) of the MVTSR
  S4.1.1.(b) of Sec.  571.139 . 
At the manufacturer’s option, the shown inflation pressure may be as much as 69 kPa (10 psi) greater than the inflation pressure corresponding to the specified maximum load. 
S6.  Test procedures, conditions and performance requirements 
Each tire shall meet all of the applicable requirements of this section when tested according 
to the conditions and procedures set forth in S5 and S6.1 through S6.6. 
S6.1  Tire dimensions 
S6.1.1  Test conditions and procedures S6.1.1.1   Tire preparation  
S6.1.1.1.1   Mount the tire on the measuring rim specified by the tire manufacturer or in one 
of the publications listed in section 8 of the MVTSR
  S4.1.1 . 
S6.1.1.1.2   For passenger car tires, inflate to the pressure specified in the following table: 
Inflation pressure (kPa) 
Standard Reinforced 
180 220 
S6.1.1.1.3   In the case of a LT tire, inflate it to the pressure at maximum load as labeled on 
the sidewall. 
S6.1.1.1.4   Condition the assembly at an ambient room temperature of 20°C to 30°C for not 
less than 24 hours. New Radial Ply Tires for   
Motor Vehicles With a GVWR of 4 536 kg or Less TSD No. 139, Revision 0  
Effective: November 20, 2013   8 S6.1.1.1.5   Readjust the tire pressure to that specified in S6.1.1.1.2 or in S6.1.1.1.3, as 
applicable . 
S6.1.1.2 Test procedure 
S6.1.1.2.1   Measure the section width and overall width by caliper at six points 
approximately equally spaced around the circumference of the tire, avoiding measurement of the additional thickness of the special protective ribs or bands. The averages
 of the 
measurements so obtained are taken as the section width and overall width, respectively. 
S6.1.1.2.2   Determine the outer diameter by measuring the maximum circumference of the 
tire and dividing the figure so obtained by Pi (3.14). 
S6.1.2  Performance requirements  
The actual section width and overall width for each tire, measured in accordance 
with S6.1.1.2, shall not exceed the section width and overall width  specified in a submission 
made by an individual manufacturer, pursuant to subsection 8(1) of the MVTSR  S4.1.1(a) , or 
in one of the publications described in subsection 8(2) of the MVTSR  S4.1.1(b) , for its size 
designation and type by more than: 
(a) (For tires with a maximum permissible inflation pressure of 220, 250, or 275 kPa  (32, 
36, or 40 psi) 7 percent, or 
(b) (For tires with a maximum permissible inflation pressure of 240, 280, 300, 340, or 
350 kPa) 7 percent or 10 mm (0.4 inches), whichever is larger. New Radial Ply Tires for   
Motor Vehicles With a GVWR of 4 536 kg or Less TSD No. 139, Revision 0  
Effective: November 20, 2013   9 S6.2  High speed performance 
S6.2.1  Test conditions and procedures S6.2.1.1 Preparation of tire S6.2.1.1.1   Mount the tire on a test rim and inflate it to the pressure specified for the tire in 
the following table: 
Tire application Test pressure 
(kPa)  
Passenger car tires 
Standard load 220 
Extra load 260 
Load Range C 320 
Load Range D 410 
Load Range E 500 
Light-truck tires  Light truck tires  with 
a nominal cross section > 295 mm 
(11.5 inches) 
Load Range C 230 
Load Range D 320 
Load Range E 410 
S6.2.1.1.2   Condition the assembly at 32°C to 38°C for not less than 3 hours. 
S6.2.1.1.3   Before or after mounting the assembly on a test axle, readjust the tire pressure to 
that specified in S6.2.1.1.1. 
S6.2.1.2  Test procedure 
S6.2.1.2.1   Press the assembly against the outer face of a test drum with a diameter 
of 1.70 m ± 1%. 
S6.2.1.2.2   Apply to the test axle a load equal to 85% of the tire’s maximum load carrying 
capacity. 
S6.2.1.2.3   Break in the tire by running it for 2 hours at 80 km/h. 
S6.2.1.2.4   Allow tire to cool to 38°C and readjust inflation pressure to applicable pressure 
in 6.2.1.1.1 immediately before the test. New Radial Ply Tires for   
Motor Vehicles With a GVWR of 4 536 kg or Less TSD No. 139, Revision 0  
Effective: November 20, 2013   10 S6.2.1.2.5   Throughout the test, the inflation pressure is not corrected and the test load is 
maintained at the value applied in S6.2.1.2.2. 
S6.2.1.2.6   During the test, the ambient temperature, measured at a distance of not less than 
150 mm and not more than 1 m from the tire, is maintained at not less than 32°C or more than 38°C. 
S6.2.1.2.7   The test is conducted, continuously and uninterrupted, for ninety minutes through 
three thirty-minute consecutive test stages at the following speeds: 140, 150, and 160 km/h. 
S6.2.1.2.8   Allow the tire to cool for between 15 minutes and 25 minutes. Measure its 
inflation pressure. Then, deflate the tire, remove it from the test rim, and inspect it for the conditions specified in S6.2.2(a). 
S6.2.2  Performance requirements 
When the tire is tested in accordance with S6.2.1: 
(a) There shall be no visual evidence of tread, sidewall, ply, cord, innerliner, belt or bead 
separation, chunking, open splices, cracking, or broken cords. 
(b) The tire pressure, when measured at any time between 15 minutes and 25 minutes 
after the end of the test, shall not be less than 95% of the initial pressure specified in S6.2.1.1.1. 
S6.3  Tire endurance 
S6.3.1  Test conditions and procedures S6.3.1.1  Preparation of tire S6.3.1.1.1   Mount the tire on a test rim and inflate it to the pressure specified for the tire in 
the following table: 
Tire application Test pressure (kPa)
Passenger car tires 
Standard load 180 
Extra load 220 
Load Range C 260 
Load Range D 340 
Load Range E 410 New Radial Ply Tires for   
Motor Vehicles With a GVWR of 4 536 kg or Less TSD No. 139, Revision 0  
Effective: November 20, 2013   11 Light-truck tires  Light truck tires  with 
a nominal cross section > 295 mm 
(11.5 inches)  
Load Range C 190 
Load Range D 260 
Load Range E 340 
S6.3.1.1.2   Condition the assembly at 32°C to 38°C for not less than 3 hours.  
S6.3.1.1.3   Readjust the pressure to the value specified in S6.3.1.1.1 immediately before 
testing. 
S6.3.1.2  Test procedure 
S6.3.1.2.1   Mount the assembly on a test axle and press it against the outer face of a smooth 
wheel having a diameter of 1.70 m ± 1%. 
S6.3.1.2.2   During the test, the ambient temperature, measured  at a distance of not less than 
150 mm and not more than 1 m from the tire, is maintained at not less than 32°C or more than 38°C. 
S6.3.1.2.3   Conduct the test, without interruption, at the test speed of not less than 120 km/h 
with loads and test periods not less than those shown in the following table. For winter tires
 
snow tires , conduct the test at not less than 110 km/h. 
Test period Duration
(hours)  Load as a percentage of  
tire maximum load rating 
1 4 85 
2 6 90 
3 24 100 
S6.3.1.2.4   Throughout the test, the inflation pressure is not corrected and the test loads are 
maintained at the value corresponding to each test period, as shown in the table in S6.3.1.2.3. 
S6.3.1.2.5   Allow the tire to cool for between 15 minutes and 25 minutes after running the 
tire for the time specified in the table in S6.3.1.2.3. Measure its inflation pressure. Inspect the tire externally on the test rim for the conditions specified in S6.3.2(a). 
S6.3.2  Performance requirements 
When the tire is tested in accordance with S6.3.1: New Radial Ply Tires for   
Motor Vehicles With a GVWR of 4 536 kg or Less TSD No. 139, Revision 0  
Effective: November 20, 2013   12 (a) There shall be no visual evidence of tread, sidewall, ply, cord, belt or bead separation, 
chunking, open splices, cracking, or broken cords. 
(b) The tire pressure, when measured at any time between 15 minutes and 25 minutes 
after the end of the test, shall not be less than 95% of the initial pressure specified in S6.3.1.1.1. 
S6.4  Low inflation pressure performance 
S6.4.1  Test conditions and procedures S6.4.1.1  Preparation of tire S6.4.1.1.1   This test is conducted following completion of the tire endurance test using the 
same tire and rim assembly tested in accordance with S6.3 with the tire deflated to the following appropriate pressure: 
Tire application Test pressure 
(kPa)  
Passenger car tires 
Standard load 140 
Extra load 160 
Load Range C 200 
Load Range D 260 
Load Range E 320 
Light-Truck Tires  Light Truck Tires  
with a nominal cross section > 295 mm 
(11.5 inches) 
Load Range C 150 
Load Range D 200 
Load Range E 260 
S6.4.1.1.2   After the tire is deflated to the appropriate test pressure in S6.4.1.1.1 at the 
completion of the endurance test, condition the assembly at 32°C to 38°C for not less than 2 hours. 
S6.4.1.1.3   Before or after mounting the assembly on a test axle, readjust the tire pressure to 
that specified in S6.4.1.1.1. New Radial Ply Tires for   
Motor Vehicles With a GVWR of 4 536 kg or Less TSD No. 139, Revision 0  
Effective: November 20, 2013   13 S6.4.1.2  Test procedure 
S6.4.1.2.1   The test is conducted for ninety minutes at the end of the test specified in S6.3, 
continuously and uninterrupted, at a speed  of 120 km/h (75 mph). For winter tires  snow tires , 
conduct the test at not less than 110 km/h. 
S6.4.1.2.2   Press the assembly against the outer face of a test drum with a diameter of 
1.70 m ± 1%. 
S6.4.1.2.3   Apply to the test axle a load equal to 100% of the tire’s maximum load carrying 
capacity. 
S6.4.1.2.4   Throughout the test, the inflation pressure is not corrected and the test load is 
maintained at the initial level. 
S6.4.1.2.5   During the test, the ambient temperature, measured  at a distance of not less than 
150 mm and not more than 1 m from the tire, is maintained at not less than 32°C or more than 38°C. 
S6.4.1.2.6   Allow the tire to cool for between 15 minutes and 25 minutes. Measure its 
inflation pressure. Then, deflate the tire, remove it from the test rim, and inspect it for the conditions specified in S6.4.2(a). 
S6.4.2  Performance requirements  
When the tire is tested in accordance with S6.4.1: 
(a) There shall be no visual evidence of tread, sidewall, ply, cord, innerliner, belt or bead 
separation, chunking, open splices, cracking, or broken cords, and 
(b) The tire pressure, when measured at any time between 15 minutes and 25 minutes 
after the end of the test, shall not be less than 95% of the initial pressure specified in S6.4.1.1.1. 
S6.5  Tire strength 
S6.5.1   Tire strength for passenger car tires . Each tire shall comply with the requirements 
of S5.3 of TSD 109
 Sec. 571.109 . 
S6.5.2   Tire strength for LT tires . Each tire shall comply with the requirements of S7.3 of 
TSD 119  Sec. 571.119 . New Radial Ply Tires for   
Motor Vehicles With a GVWR of 4 536 kg or Less TSD No. 139, Revision 0  
Effective: November 20, 2013   14 S6.6  Tubeless tire bead unseating resistance 
Each tire shall comply with the requirements of S5.2 of TSD 109  Sec. 571.109 . For light-
truck tires  light truck tires , the maximum permissible inflation pressure to be used for the 
bead unseating test is as follows: 
Load Range C 260 kPa 
Load Range D 340 kPa 
Load Range E 410 kPa 
For light-truck tires  light truck tires  with a nominal cross-section greater than 295 mm 
(11.5 inches), the maximum permissible inflation pressure to be used for the bead unseating test is as follows: 
Load Range C 190 kPa 
Load Range D 260 kPa 
Load Range E 340 kPa 
S7.  Phase-in schedule for tire markings 
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