1994 GMC Suburban Owner's Manual - Page 308

Tires We don't make tires. Your new vehicle comes with high quality tires made by a leading tire manufacturer. These tires are warranted by the tire manufacturers and their warranties are delivered with every new vehicle. If your spare tire is adifferent brand than your road tires, you will have a tire warranty folder from each of these manufacturers. Inflation - Tire Pressure The Certificatioflire label which is on the rear edge of the driver's door, or on the incomplete vehicle document in the cab, shows the correct inflation pressures for your tires, when they're cold. "Cold" means your vehicle has been sitting for at least three hours or driven no more than a mile. 6-62