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  • 7 years ago
ARE YOUR TIRES TELLING YOU SOMETHING

Understand the numbers and letters on your tire

checking & understanding the tread wear

Tire tread wear can tell you a lot about a suspension. Most specifically, it can tell you if the angles, inflation and components are within specification. Here are the most common tread wear patterns and what causes them.

Over-inflated Tires
Tire tread wear in the center of the tread pattern tells you that the inflation patterns are too high. Too much pressure can cause the contact patch to shrink and the center of the tire to carry the entire load.

Tire Feathering
The indicator of excessive positive or negative toe angle is a tire feathering or scuffing that can be detected by stroking your fingertips across the edge of each tread bar or tread block. A feather edge on the inside of the tread bar indicates excess toe-in, while a feather edge on the outside of the tread bar indicates toe-out. Because toe angle is affected by changes in camber and caster angles, it’s always the last angle to be adjusted during the wheel alignment process. In addition, any change in camber or caster angles will immediately change the toe angle. Toe angle geometry can also be greatly affected by changes in suspension height.

Checking and Maintaining Your Tires
Tire maintenance for motor vehicles is based on several factors. The chief reason for tire replacement is friction from moving contact with road surfaces, causing the tread on the outer perimeter of tires to eventually wear away. When the tread depth becomes too shallow (less than 0.125in./3.2mm), the tire is worn out and should be replaced. The same wheels can usually be used throughout the lifetime of the car.

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