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
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Tire Ratings and Tire Safety

Understanding Tire Specifications

Your tires may be the most important equipment for your vehicle. But how do you know yours are safe or which tires to buy in the first place? Most people do not pay enough attention to their tires. This mistake costs money and potentially puts you and others on the road in danger.  I’ll show how to understand all about the tires you have and examine tire specification to learn the tires you need. We'll review tire basics too, like how to “read” your tires, check your tire pressure and give you some maintenance tips. This will help to eliminate the potential hazards and save you some money at the same time.

P212/65R15 95H M+S, 3108 AA 400 B 32 psi”.  No, I  didn’t just give you the atomic formula of some new manmade radioactive compound.  These are sidewall tire codes that can be found on all tires manufactured today.  They tell you the tire size, wheel size, speed rating, traction rating, temperature rating, driving condition type, inflation limit, and whether they are passenger car or truck tires.  Below are diagrams and descriptions found in a brochure provided by National Highway Traffic Safety Administration.

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


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