Your GMC tires have a load index and tire speed rating symbol (see diagram). Use the Tire Finder (above) to find the Original Equipment tire size, tire load index, and a tire speed rating for your GMC vehicle.
A load index is an assigned number ranging from 1 to 279 that corresponds to the load-carrying capacity of a tire. Passenger cars and light-duty trucks generally have a load index number that ranges 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 your vehicle. Do not replace tires on your vehicle with a lower load and speed value. Replacing tires that have a higher load and speed value is acceptable.
Note: Winter tires often have lower speed ratings. If winter tires are not available in the same speed rating as the Original Equipment tires, you must not exceed the speed rating of the winter tire chosen.
Tire speed ratings tell the speed your tire can safely maintain over time. The U.S. Department of Transportation (DOT) set the ratings scale, shown below. But tire manufacturers test their own tires and assign their own tire speed ratings. On the sidewall of every tire, you'll find one of these tire speed rating codes:
Up to $100 via a tire rebate by debit card and up to $100 in statement credit. ∆∆∆Instant credit approval required. If your decision is deferred and is approved at a later time, or should you receive instant credit and choose to wait to make a purchase, you are eligible to receive this promotion within the first 30 days of application approval. This onetime credit will appear on your first or second statement and will be in the amount of your first purchase, up to $100, on service, parts, or accessories. Offer ends 4/30/17. ††See participating U.S. dealer for details and rebate form, which must be postmarked by 5/31/17. Allow 6 to 8 weeks for delivery of debit card. Rebate form and details available at mycertifiedservicerebates.com. Offer ends 4/30/17. Cannot be combined with other tire manufacturer-sponsored or BuyPower Card rebates/offers.