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274 SERVICING AND MAINTENANCE
These effects can be reduced by timely rotation
of tires. The benefits of rotation are especially
worthwhile with aggressive tread designs such
as those on all season type tires. Rotation will
increase tread life, help to maintain mud, snow
and wet traction levels, and contribute to a
smooth, quiet ride.
Refer to “Scheduled Servicing” in “Servicing
And Maintenance” for the proper maintenance
intervals. The reasons for any rapid or unusual
wear should be corrected prior to rotation being
performed.
The suggested rotation method is the “rearward
cross” shown in the following diagram. This
rotation pattern does not apply to some direc-
tional tires that must not be reversed.
Tire Rotation (Rearward Cross)
DEPARTMENT OF TRANSPORTATION
UNIFORM TIRE QUALITY GRADES
The following tire grading categories were
established by the National Highway Traffic
Safety Administration. The specific grade rating
assigned by the tire's manufacturer in each
category is shown on the sidewall of the tires on
your vehicle.
All passenger vehicle tires must conform to
Federal safety requirements in addition to
these grades.
Treadwear
The Treadwear grade is a comparative rating,
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 one-half 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 char-
acteristics and climate.
Traction Grades
The Traction grades, from highest to lowest, are
AA, A, B, and C. These grades represent the
tire's ability to stop on wet pavement, as
measured under controlled conditions on spec-
ified government test surfaces of asphalt and
concrete. A tire marked C may have poor trac-
tion performance.
Temperature Grades
The Temperature grades are A (the highest), B,
and C, representing the tire's resistance to the
generation of heat and its ability to dissipate
heat, when tested under controlled conditions
on a specified indoor laboratory test wheel.
WARNING!
The traction grade assigned to this tire is
based on straight-ahead braking traction
tests, and does not include acceleration,
cornering, hydroplaning, or peak traction
characteristics.
20_LX_OM_EN_US_t.book Page 274
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