Chevrolet 2007 Silverado 1500 Pickup Owner's Manual page 548

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 lbs (68 kg). See Loading Your Vehicle
on page 403.
Occupant Distribution: Designated seating
positions.
Outward Facing Sidewall: The side of an
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.
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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 as shown on the tire placard. See
Inflation - Tire Pressure on page 550 and
Loading Your Vehicle on page 403.
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.