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are raised sections spaced intermittently in the bottom of the tread grooves. When they
appear “even” with the outside of the tread, it is time to replace your tires. another method
for checking tread depth is to place a penny in the tread with Lincoln’s head upside down
and facing you. if you can see the top of Lincoln’s head, you are ready for new tires.
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 counter
balance 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.
a Tire rotation example
For maximum mileage, rotate your tires every 5,000 miles. Follow correct rotation patterns.
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.
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
