WHERE TO FIND TIRE SPEED RATING & LOAD INDEX
A load index is a number from 1 to 279 that corresponds to the load-carrying capacity of a tire. Cars and light-duty trucks have load index numbers from 72 to 120.
We recommend replacing your GMC tires with ones that have the same load and speed values as those originally installed on the vehicle. Tires with lower values are not recommended, but tires with higher values are acceptable.
Use the Tire Finder tool to find the Original Equipment tire size, load index, and speed rating for your vehicle.
Note: Winter tires often have lower speed ratings. If winter tires are not available in the same speed rating as the Original Equipment tires, do not exceed the speed rating of the tire chosen.
WHAT ARE TIRE SPEED RATINGS?
They indicate the speed your tire can safely maintain over time. The U.S. Department of Transportation (DOT) set the ratings scale below. On the sidewall of every tire, you'll find one of these tire speed rating codes: