GMC 2003 Envoy - Manual (Page 356)

Quality grades сэп be found where applicable on ihe
lire sidewall between uead shoulder and majilmum
section width. For e^arriple'
Treadwear 200 Traction AA Temperature A
The following Information reíales lo ihe system
developed by the Uniled States National Highway
TraFfie Safety Adn>lnistrallon, which grades tires hy
iroadwear, traction and remperaiure performance
(This applies Only lo vehicles sold m the Untied States.}
Tha grades are molded on The sidewalls of most
passenger car linos. Tha Uniform Tirtj Quality Grading
system does not apply to deep tread, winter-type
snow finis, spacQ’savQr or lerriporary use spare fires,
tires wilh nonrinal rim diameters of 10 lo 12 inches
(Й5 to 30 от}, or lo some Iimiled'production fires.
yVhila lha tires available on General Motors passengor
cars and' light trucks may vary with respect to these
grades, they must also conform I d federal safoty
requirements and additional General Motors Tire
Portornnance Criteria (TPQ standards.
Uniform Tire Quality Grading
The treadwear grade is a comparalive rating based on
ihe wear rale of the tire whan tested undor contrallad
condilions on
a specified government lest COUfSe
For example, a tire graded 150 would wear one and
a halt (1.5) times as well on the govomment course as
a tire graded 100. The relative performance of tires
depends upon (he actual conditions ot their usci
however, and may depart significantly From Ihe norm
due to variations in driving habils, service practices and
difforonces In rped characleristics and cl ¡male.
Traction ^ AAi A^ B, C
The tiaction gradeSn trom highest to lowest, are AA, A.
B, and C. Those grades represenl the ire's ability
10 slop on wet pavemenf as measured under controlled
condEtrons on specified governmenl leat surfaces of
asphalt and concrete. A tire marked C may have poor
traclion performance.
Warning: The traction grade
assigned lo fhis tire is based on siraight-ahead braking
traclion tasts, and does not include acceleration,
cornering, hydroplaning, or peak fraction characteristics.
Treadwear
5^61