2006 Mercedes SLK-Class Owner's Manual - Page 345

Operation Tires and wheels Tire and loading terminology Accessory weight The combined weight (in excess of those standard items which may be replaced) of automatic transmission, power steering, power brakes, power windows, power seats, radio, and heater, to the extent that these items are available as factory-installed equipment (whether installed or not). Air pressure The amount of air inside the tire pressing outward on each square inch of the tire. Air pressure is expressed in pounds per square inch (psi), or kilopascal (kPa), or bars. Aspect ratio Dimensional relationship between tire section height and section width expressed in percentage. Bar Another metric unit for air pressure. There are 14.5038 pounds per square inch (psi) to 1 bar; there are 100 kilopascals (kPa) to 1 bar. Bead The tire bead contains steel wires wrapped by steel cords that hold the tire onto the rim. Cold tire inflation pressure Tire inflation pressure when your vehicle has been sitting for at least three hours or driven no more than one mile (1.6 km). Curb weight The weight of a motor vehicle with standard equipment including the maximum capacity of fuel, oil, and coolant, and, if so equipped, air conditioning and additional optional equipment, but without passengers and cargo. DOT (Department of Transportation) A tire branding symbol which denotes the tire meets requirements of the U.S. Department of Transportation. GAWR (Gross Axle Weight Rating) The GAWR is the maximum permissible axle weight. The gross vehicle weight on each axle must never exceed the GAWR for the front and rear axle indicated on the certification label located on the driver's door B-pillar. GVW (Gross Vehicle Weight) The GVW comprises the weight of the vehicle including fuel, tools, spare wheel, installed accessories, passengers and cargo and, if applicable, trailer tongue load. The GWV must never exceed the GWVR indicated on the certification label located on the driver's door B-pillar. 344