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TIRE BALANCE AND WHEEL ALIGNMENT
To avoid vibration or shaking of the vehicle when a tire rotates,
the tire must be properly balanced. This balance is achieved by
positioning weights on the wheel to counterbalance heavy spots
on the wheel-and-tire assembly. A wheel alignment adjusts the
angles of the wheels so that they are positioned correctly relative
to the vehicle’s frame. This adjustment maximizes the life of your
tires and prevents your car from veering to the right or left when
driving on a straight, level road. These adjustments require special
equipment and should be performed by a qualified technician.
TIRE ROTATION
Rotating tires from front to back and from side to side can
reduce irregular wear (for vehicles that have tires that are all the
same size). Look in your owner’s manual for information on how
frequently the tires on your vehicle should be rotated and the best
pattern for rotation.
TIRE REPAIR
The proper repair of a punctured tire requires a plug for the
hole and a patch for the area inside the tire that surrounds the
puncture hole. Punctures through the tread can be repaired if
they are not too large, but punctures to the sidewall should not
be repaired. Tires must be removed from the rim to be properly
inspected before being plugged and patched.
TIRE FUNDAMENTALS
Federal law requires tire manufacturers to place standardized
information on the sidewall of all tires. This information identifies
and describes the fundamental characteristics of the tire and
also provides a tire identification number for safety standard
certification and in case of a recall.
UNIFORM TIRE QUALITY GRADING
SYSTEM (UTQGS)
To help consumers compare a passenger car tire’s treadwear rate,
traction performance, and temperature resistance, the federal
government requires tire manufacturers to grade tires in these
three areas. This grading system, known as the Uniform Tire
Quality Grading System, provides guidelines for making relative
comparisons when purchasing new tires. You also can use this
information to inquire about the quality of tires placed on new
vehicles.
Although this rating system is very helpful when buying new tires,
it is not a safety rating or guarantee of how well a tire will perform
or how long it will last. Other factors such as personal driving
style, type of car, quality of the roads, and tire maintenance
habits have a significant influence on your tire’s performance and
longevity.
Treadwear grades are an indication of a tire’s relative wear rate.
The higher the treadwear number is, the longer it should take for
the tread to wear down. For example, a tire grade of 400 should
wear twice as long as a tire grade of 200.
Traction grades are an indication of a tire’s ability to stop on wet
pavement. A higher graded tire should allow you to stop your car
on wet roads in a shorter distance than a tire with a lower grade.
Traction is graded from highest to lowest as “AA”, “A”, “B”, and
“C”.
Temperature grades are an indication of a tire’s resistance to heat.
Sustained high temperature (for example, driving long distances in
hot weather), can cause a tire to deteriorate, leading to blowouts
and tread separation. From highest to lowest, a tire’s resistance to
heat is graded as “A”, “B”, or “C”.
A TIRE ROTATION EXAMPLE
For maximum mileage, rotate your tires every 5,000 miles.
Follow correct rotation patterns.
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