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Tlras&Wheals
Introductlon
Uniform Tire Quality Grading
Vehlcle Overvlew
The following information relates to the tire grading system developed by the
National HighwayTrafficSafelyAdministration INHTSA) which will gradetires
bytread wear. troctlon and temperature performance.
Openlng & Closing
Seatlng & Safety Restralnts
Note.. Tlres thothave deep tread, ond wlntertlres, are exemptfrom these
marking requirement&
Drlvlng & Op•ratlng
Qualitygrad8s,whereapplicable,can befound on thetire sidewall betweenthe
Iread shoulderand maxlmum sectlonwldth. Forexample..
Advanced Drlvor
Asslstanee Sygtems(ADAS)
TREADWEAR180
TRACTION A4
TEMPERATUREA
In addltion to the marklng requlrements, passenger car tires must conform to
Federal Safety Requlrements
Infolalnment
Hlgh-voltage Battery Pack
& Charglng
Treaoknar
The treadwear grade Is a comparatlv8 ratlng based on tha wear rate of the tSre
when tested under controlled condltlons on a speclfied government te8t course,
Malntenance
Forexample, otlregraded150would wear oneand o holftlmes as well on a
governmentlest course as a tlre graded100. The relotlve performance oftlres
dependson the actual conditlonsofthelruse, however, and maydepart
signlficantlyfrom the norm due to varlotlons In drlvlng hablts, servlce proctlces,
and dlfferences In road characterlstlcsandcllmate.
Tlros & Whoo18
Tlra Infomatlon
Understandlng Tlr8 Marklngs
Trocfjon
Note.. The tractlon grade osslgned to thls tlre Is bosedon strolght-oheadbraklng
tests, anddoes notlnclude acceleratlon, cornerlng, hydroplanlng orpeak
traction eharacteristics.
Inlernallonal TlreApproval Marks
Unlform Tlre Quallty Gradlng
The traction grades, from hlghest to I0St, are.. A4 A B, and C. Thèse grades
representatlre'sabllltyto stopon a wet pavementas measured under
conlrolled condltions on speclfied governmenttesl surfaces of asphalt and
concreta. A tlre marked C may havè poortractlon performance.
T5re ond Loodlng Informotlon Lobel
Tlre Careand Malntenance
Temperature
Tlre Prassure Monltorlng
Sy8l&m
WARNING: The temperature grade for thls tlre Is estobllshed for a tlre
that Is properly Inflated and not overloaded. Excesslve speed. under-
Inflatlon. or excesslve loadlng. elther 9eparatety or In comblnatlon. can
Cause heat bulld-up and posslbletlre fallur
Tlre RepaSr
The lemperature grades areA (the highest), B, and C, representing thetire's
resistance to the g8neration of heat and its abilityto dissipate heal when tested
under controlled condltions on a speclfied Indoor laboratory testwheel.
V&hl¢lo L¢adlng
Sustalned hlgh temperature con cause the materlal ofthe tlre to degenerate and
reduce tire life, and excessive temperature can lead to sudden tire failure.
GlossaryofTerms
The gradeccorrespondstoa levelof performancewhich all passengercar
tires must meet under the Federal Motor Safety Standard No.109.
Technlcal Data
Grades B and A represent higher levels of performance on the laboratory test
wheelthonthe minimum required by law.
Roadside Assistance &
Emergency InformatSon
