Jeep Grand Cherokee SRT8 2012 Owner's Manual page 540

538 IF YOU NEED CONSUMER ASSISTANCE
Department Of Transportation Uniform Tire
Quality Grades . . . . . . . . . . . . . . . . . . . . . . . . 545
▫ Treadwear . . . . . . . . . . . . . . . . . . . . . . . . . 545
▫ Traction Grades . . . . . . . . . . . . . . . . . . . . . 545
▫ Temperature Grades . . . . . . . . . . . . . . . . . . 546