Information on Passenger Vehicle Tires
Diagram and Fundamentals
Tire Class

Tire Width

Aspect Ratio
Wheel Size
Load Ratings Index
Speed Rating
DOT Identification Number
Maximum Inflation Pressure
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
Recommended Installers
Find Wheels By Brand

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Tire Ratings and Tire Safety

Additional Information on Light Truck Tires

Please refer to diagram below.

image of tires with call outs

Tires for light trucks have other markings besides those found on the sidewalls of passenger tires.


The "LT" indicates the tire is for light truck. These tires are manufactured especially for trucks and the expected loads they will carry. They perform differently than passenger tires and are less safe on a car even if they are the same size.

Tire Ply Composition and Materials Used

It used to be that ply number indicated the number of layers of rubber-coated fabric in the tire. In general, the greater the number of plies, the more weight a tire can support. Tire manufacturers also must indicate the materials in the tire, which include steel, nylon, polyester, and others. Today's load range/ply actually indicates the equivalent strength that early ply tires had and do not represent the actual number of ply layers found inside the tire. In fact most radial passenger tires today only have one or two body plies, and light truck tires, even those with heavy duty ratings (10-, 12- or 14-ply rated), actually have only two or three fabric body plies, or one steel ply.

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