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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. These
adjustments require special equipment and should be performed by a qualified technician.
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.
Information on Passenger Vehicle Tires
Please refer to the diagram below.
P
- The “P” indicates the tire is for passenger vehicles.
Next number
- This three-digit number gives the width in millimeters of the tire from sidewall edge to
sidewall edge. In general, the larger the number, the wider the tire.
Next number
- This two-digit number, known as the aspect ratio, gives the tire’s ratio of height to width.
Numbers of 70 or lower indicate a short sidewall for improved steering response and better overall
handling on dry pavement.
R
- The “R” stands for radial. Radial ply construction of tires has been the industry standard for the past
20 years.
Next number
- This two-digit number is the wheel or rim diameter in inches. If you change your wheel
size, you will have to purchase new tires to match the new wheel diameter.
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