Passenger (P-Metric) Tire: A tire used onpassenger cars and some light duty trucksand multipurpose vehicles.Recommended Inflation Pressure: Vehiclemanufacturer’s recommended tire inflation pressureas shown on the tire placard. See Inflation - TirePressure on page 5-64 and Loading the Vehicleon page 4-24.Radial Ply Tire: A pneumatic tire in which theply cords that extend to the beads are laid at90 degrees to the centerline of the tread.Rim: A metal support for a tire and upon whichthe tire beads are seated.Sidewall: The portion of a tire between the treadand the bead.Speed Rating: An alphanumeric code assigned toa tire indicating the maximum speed at which atire can operate.Traction: The friction between the tire and theroad surface. The amount of grip provided.Tread: The portion of a tire that comes intocontact with the road.Treadwear Indicators: Narrow bands, sometimescalled wear bars, that show across the tread of atire when only 1/16 inch (1.6 mm) of tread remains.See When It Is Time for New Tires on page 5-73.UTQGS (Uniform Tire Quality GradingStandards): A tire information system thatprovides consumers with ratings for a tire’straction, temperature, and treadwear. Ratingsare determined by tire manufacturers usinggovernment testing procedures. The ratingsare molded into the sidewall of the tire. SeeUniform Tire Quality Grading on page 5-77.Vehicle Capacity Weight: The number ofdesignated seating positions multiplied by 150 lbs(68 kg) plus the rated cargo load. See Loadingthe Vehicle on page 4-24.5-61
