2010 Mercedes GLK-Class Owner's Manual - Page 237

Tires and wheels Thoroughly clean the mounting face of wheels and brake disks, i.e. the inner side of the wheels/tires, during each rotation. Check for and ensure proper tire inflation pressure. For information on wheel change, see "Flat tire" (Y page 312). 235 i For illustration purposes only. Actual data on tires are specific to each vehicle and may vary from data shown in above illustration. For more information, see "Rims and tires" (Y page 331). Tire size designation, load and speed rating Tire labeling Besides tire name (sales designation) and manufacturer name, a number of markings can be found on a tire. Following are some explanations for the markings on your vehicle's tires: : Tire width ; Aspect ratio in % = Radial tire code ? Rim diameter A Load index B Speed symbol : Uniform Tire Quality Grading Standards (Y page 233) ; DOT, Tire Identification Number (Y page 238) = Maximum tire load (Y page 231) ? Maximum tire inflation pressure A B C D E (Y page 227) Manufacturer Tire ply material (Y page 239) Tire size designation, load and speed rating (Y page 235) Load identification (Y page 238) Tire name i For illustration purposes only. Actual data on tires are specific to each vehicle and may vary from data shown in above illustration. General: Depending on the design standards used, the tire size molded into the sidewall may have no letter or a letter preceding the tire size designation. No letter preceding the size designation (as illustrated above): Passenger car tire based on European design standards. Letter "P" preceding the size designation: Passenger car tire based on U.S. design standards. Letter "LT" preceding the size designation: Light Truck tire based on U.S. design standards. Z Operation