Find the right tires for your vehicle at a Certified Service dealer near you.

PARTS OF A TIRE

Tires are a driver's only contact with the road, transferring actions such as steering, braking, accelerating, and turning. They are specifically chosen for each vehicle, making tires one of the most important safety features on a car, truck, or crossover. See your Certified Service experts for tips and helpful advice so you can make an informed decision on the right tires for you.

TIRE PARTS GLOSSARY

Tires are made up of many different parts, and it’s important to understand how they work.


Click each letter for more information.

READING A TIRE SIDEWALL

Since tires play a major role in establishing the performance and handling characteristics of a vehicle, many manufacturers require their tire suppliers to identify their Original Equipment (OE) tires with symbols or codes branded on the sidewalls.

 

The goal is to make it easier for owners to identify and select exact replacements when their OE tires wear out. The information provided below will allow you to decode the information on a tire sidewall and help you make the right choice in replacement tires. And your Certified Service experts are always there to answer your questions and provide helpful advice.

 

 

A. Tire Size

The tire size is a combination of letters and numbers used to define a particular tire's width, height, aspect ratio, construction type, and service description.

 

B. Maximum Cold Inflation Load Limit

This information tells the maximum load that can be carried and the maximum pressure needed to support that load. Please note that you should always inflate your tires to the pressure noted on the tire pressure placard (typically located on your driver door frame) or in your Owner’s Manual. To find more information on tire pressure and inflation, click here.

 

C. Tire Performance Criteria Specification (TPC Spec)

Most OE tires designed to GM's specific tire performance criteria have a TPC spec code moulded onto the sidewall. GM's TPC specs meet or exceed all federal safety guidelines.


 

D. Winter Tire Symbol

Tires designed specifically for use in winter conditions (snow, slush, ice, and low temperatures) feature a three-peak mountain snowflake symbol.

How To Read a GMC Tire Sidewall Diagram