2011 Mercedes R-Class Owner's Manual - Page 338

336 Tire labeling performance which all passenger car tires must meet under the Federal Motor Vehicle Safety Standard No. 109. Grades B and A represent higher levels of performance on the laboratory test wheel than the minimum required by law. Tire labeling Overview of tire labeling The following markings are on the tire in addition to the tire name (sales designation) and the manufacturer's name: Interchanging the wheels G Warning Rotate front and rear wheels only if the tires are of the same dimension. If your vehicle is equipped with mixed-size tires (different tire dimensions front vs. rear), tire rotation is not possible. G Warning! Tires and wheels Have the tightening torque checked after changing a wheel. The wheels could come loose if they are not tightened to a torque of 110 lb-ft (150 Nm). Only use genuine Mercedes-Benz wheel bolts specified for your vehicle's rims. : Uniform Tire Quality Grading Standard (Y page 340) ; DOT, Tire Identification Number The wear patterns on the front and rear tires differ, depending on the operating conditions. Rotate the wheels before a clear wear pattern has formed on the tires. Front tires typically wear more on the shoulders and the rear tires in the center. If your vehicle's tire configuration allows, you can rotate the wheels according to the intervals in the tire manufacturer's warranty book in your vehicle documents. If no warranty book is available, the tires should be rotated every 3000 to 6000 miles (5000 to 10000 km), or earlier if tire wear requires. Do not change the direction of wheel rotation. Clean the contact surfaces of the wheel and the brake disc thoroughly every time a wheel is rotated. Check the tire pressures. Information on changing a wheel and mounting the spare wheel (Y page 301). (Y page 339) = Maximum tire load (Y page 334) ? Maximum tire pressure (Y page 330) A Manufacturer B Tire material (Y page 340) C Tire size designation, load-bearing capacity and speed index (Y page 337) D Load index (Y page 339) E Tire name i Tire data is vehicle-specific and may deviate from the data in the example.