2011 Mercedes G-Class Owner's Manual - Page 263

Uniform Tire Quality Grading Standards on the sidewall of the tire, even though these regulations do not apply to Canada. 261 i The actual values for tires are vehiclespecific and may deviate from the values in the illustration. Where applicable, the tire grading information can be found on the tire sidewall between the tread shoulder and maximum tire width. For example: i The actual values for tires are vehiclespecific and may deviate from the values in the illustration. Maximum tire load : is the maximum permissible weight for which the tire is approved. Further information on tire loads (Y page 262). Uniform Tire Quality Grading Standards Overview of Tire Quality Grading Standards Tread wear Traction 200 AA Temperature A All passenger car tires must conform to the statutory safety requirements in addition to these grades. Tread wear The tread wear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a specified U.S. government test track. For example, a tire graded 150 would wear one and one-half times as well on the government test track as a tire graded 100. The relative performance of tires depends upon the actual conditions of their use, however, and may depart significantly from the norm, due to variations in driving habits, service practices and differences in road characteristics and climate conditions. 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 have to 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 grading markings Traction G Warning The traction grade assigned to this tire is based on straight-ahead braking traction tests, and does not include acceleration, cornering, hydroplaning, or peak traction characteristics. The traction grades, from highest to lowest, are AA, A, B, and C. Those grades represent Z Wheels and tires