Information on Passenger Vehicle Tires
Diagram and Fundamentals
Tire Class

Tire Width

Aspect Ratio
Wheel Size
Load Ratings Index
Speed Rating
DOT Identification Number
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Tread Wear Number
Traction Letter
Temperature Letter
Additional Information on Light Truck Tires
Diagram and Class distinction
Load Range
Composition and Materials
Max. Load Dual " Single
Snow Tires
Additional Information
Tire Product Description
Additional Maintenance
On Your Way
Choosing the Right Tire
Snow Tires
Touring and Rain Tires
Truck and SUV Tires
Tire Ratings Articles
Consumer Tire Ratings
Tire Performance Ratings
Suspension Tech Center
Tire Decision Guide
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Tire Ratings and Tire Safety

Tread wear Number

This number indicates the tire's wear rate. The higher the tread wear number is, the longer it should take for the tread to wear down. For example, a tire graded 400 should last twice as long as a tire graded 200. A note about tread depth. You should be aware the tread depth of your tires. Technically, if a tire has a tread depth of only 2/32 of an inch or less then it is not safe, is considered defective equipment and will not pass a safety inspection. It should be replaced. You may have to replace two or even all four tires even if only one is worn in order to maintain proper control of the vehicle. A word of caution for four wheel drive vehicles: If you replace just two tires then you must make sure they are mounted in the rear of the vehicle. You may lose control of your vehicle under some conditions if they are mounted on the front. Personally I always recommend replacing all four tires at once for any vehicle. Inspection: Most tires today have wear bar indicators molded right into the tread. If you see it runs across the width of the tread then itís time to replacement. Another way to check is with a Lincoln penny. Place the head of the penny into the tread. If you can see the top of Lincolnís head then itís time for replacement.

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