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Maintenance 9-42 Ply A layer of rubber-coated parallel cords. Pneumatic tire A mechanical device made of rubber, chemicals, fabric and steel or other materials, that, when mounted on an automotive wheel provides the traction and contains the gas or fluid that sustains the load. Pneumatic options weight The combined weight of installed regular production options weighing over 5 lb. (2.3 kg) in excess of the standard items which they replace, not previously considered in curb weight or accessory weight, including heavy duty breaks, ride levelers, roof rack, heavy duty battery, and special trim. Recommended Inflation Pressure Vehicle manufacturer’s recommended tire inflation pressure as shown on the tire placard. Radial Ply Tire A pneumatic tire in which the ply cords that extend to the beads are laid at 90 degrees to the centerline of the tread. Rim A metal support for a tire and upon which the tire beads are seated. Sidewall The portion of a tire between the tread and the bead. Speed Rating An alphanumeric code assigned to a tire indicating the maximum speed at which a tire can operate. Traction The friction between the tire and the road surface. The amount of grip provided. Tread The portion of a tire that comes into contact with the road. Treadwear Indicators Narrow bands, sometimes called “wear bars”, that show across the tread of a tire when only 1/16 inch of tread remains. UTQGS Uniform Tire Quality Grading Standards is a tire information system that provides consumers with ratings for a tire’s traction, temperature and treadwear. Ratings are determined by tire manufacturers using government testing procedures. The ratings are molded into the sidewall of the tire. Vehicle Capacity Weight The number of designated seating positions multiplied by 150 lbs. (68 kg) plus the rated cargo and luggage load. Vehicle Maximum Load on the Tire Load on an individual tire due to curb and accessory weight plus maximum occupant and cargo weight. Vehicle Normal Load on the Tire Load on an individual tire that is determined by distributing to each axle its share of the curb weight, accessory weight, and normal occupant weight and dividing by 2. Vehicle Placard A label permanently attached to a vehicle showing the original equipment tire size and recommended inflation pressure. |