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Load Index: An assigned number ranging from 1 to
279 that corresponds to the load carrying capacity of
a tire.
Maximum Inflation Pressure: The maximum air
pressure to which a cold tire may be inflated. The
maximum air pressure is molded onto the sidewall.
Maximum Load Rating: The load rating for a tire at the
maximum permissible inflation pressure for that tire.
Maximum Loaded Vehicle Weight: The sum of curb
weight; accessory weight; vehicle capacity weight;
and production options weight.
Normal Occupant Weight: The number of occupants
a vehicle is designed to seat multiplied by 150 pounds
(68 kg). See Loading Your Vehicle on page 4-34.
Occupant Distribution: Designated seating positions.
Outward Facing Sidewall: The side of a asymmetrical
tire that has a particular side that faces outward
when mounted on a vehicle. The side of the tire that
contains a whitewall, bears white lettering or bears
manufacturer, brand and or model name molding that is
higher or deeper than the same moldings on the
other sidewall of the tire.
Passenger (P-Metric) Tire: A tire used on passenger
cars and some light duty trucks and multipurpose
vehicles.
Recommended Inflation Pressure: Vehicle
manufacturer’s recommended tire inflation pressure and
shown on the tire placard. See Inflation - Tire Pressure
on page 5-61 and Loading Your Vehicle on page 4-34.
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 2/32 inch of tread remains. See When It
Is Time for New Tires on page 5-64.
5-60