Suzuki XL7 - Manual (Page 220)

5-36
SERVICE AND APPEARANCE CARE
78J00-03E
deep tread, winter-type snow tires, space-
saver, or temporary use spare tires, tires
with nominal rim diameters of 10 to 12
inches (25 to 30 cm), or, to some limited-
production tires.
While the tires available may vary with
respect to these grades, they must also
conform to federal safety requirements.
Treadwear
The treadwear grade is a comparative rat-
ing based on the wear rate of the tire when
tested under controlled conditions on a
specified government test course. For
example, a tire graded 150 would wear
one and a half (1.5) times as well on the
government course as a tire graded 100.
The relative performance of tires depends
upon the actual conditions of their use,
however, and may depart significantly from
the norm due to variations in driving habits,
service practices, and differences in road
characteristics and climate.
Traction – AA, A, B, C
The traction grades, from highest to low-
est, are AA, A, B, and C. Those grades
represent the tire’s ability to stop on wet
pavement as measured under controlled
conditions on specified government test
surfaces of asphalt and concrete. A tire
marked C may have poor traction perfor-
mance.
Temperature – A, B, C
The temperature grades are A (the high-
est), B, and C, representing the tire’s resis-
tance to the generation of heat and its
ability to dissipate heat when tested under
controlled conditions on a specified indoor
laboratory test wheel. Sustained high tem-
perature can cause the material of the tire
to degenerate and reduce tire life, and
excessive temperature can lead to sudden
tire failure. The grade C corresponds to a
level of performance which all passenger
car tires must meet under the Federal
Motor Vehicle Safety Standard No. 109.
Grades B and A represent higher levels of
performance on the laboratory test wheel
than the minimum required by law.
Wheel Alignment and Tire Balance
The tires and wheels on your vehicle were
aligned and balanced carefully at the fac-
tory to give you the longest tire life and
best overall performance. Adjustments to
wheel alignment and tire balancing will not
be necessary on a regular basis. However,
if you notice unusual tire wear or your vehi-
cle pulling to one side or the other, the
alignment may need to be checked. If you
notice your vehicle vibrating when driving
on a smooth road, your tires and wheels
may need to be rebalanced. See your
dealer for proper diagnosis.
WARNING
The traction grade assigned to this
tire is based on straight-ahead brak-
ing traction tests, and does not
include acceleration, cornering,
hydroplaning, or peak traction char-
acteristics.
WARNING
The temperature grade for this tire is
established for a tire that is properly
inflated and not overloaded. Exces-
sive speed, underinflation, or exces-
sive loading, either separately or in
combination, can cause heat buildup
and possible tire failure.