2011 Mercedes R-Class Owner's Manual - Page 336
2011 Mercedes R-Class Manual
Page 336 highlights
334 Uniform Tire Quality Grading Standards Trailer load/noseweight The trailer load/noseweight affects the gross weight of the vehicle. If a trailer is attached, the trailer load/noseweight is included in the load along with occupants and luggage. The trailer load/noseweight is usually approximately 10 % - 15 % of the gross weight of the trailer and its cargo. Direction of rotation Tires with a specified direction of rotation have additional benefits, e.g. if there is a risk of hydroplaning. You will only gain these benefits if the correct direction of rotation is observed. An arrow on the sidewall of the tire indicates its correct direction of rotation. You may mount an emergency spare wheel/ spare wheel against the direction of rotation. Observe the time restriction on use as well as the speed limitation specified on the emergency spare wheel/spare wheel. Maximum tire load G Warning Tires and wheels Do not overload the tires by exceeding the specified load limit as indicated on the Tire and Loading Information placard on the driver's door B-pillar. Overloading the tires can overheat them, possibly causing a blowout. Overloading the tires can also result in handling or steering problems, or brake failure. Uniform Tire Quality Grading Standards Overview of tire quality standards i The actual values for tires are specific to each vehicle and may deviate from the values in the illustration. Maximum tire load : is the maximum permitted weight for which the tire is approved. Further information on tire loads (Y page 336). The Uniform Tire Quality Grading Standards are U.S. government specifications. Their purpose is to provide drivers with uniform reliable information on tire performance data. Tire manufacturers grade tires using three performance factors: tread wear :, tire traction ; and heat resistance =. All tires sold in North America are provided with the corresponding quality class mark on the sidewall of the tire, even though these regulations do not apply to Canada. i The actual values for tires are specific to each vehicle and may deviate from the values in the illustration.