CHEVROLET 2009 Impala - Manual (Page 311)

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 the Vehicle on
page 4-20.
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.
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 5-60 and Loading
the Vehicle on page 4-20.
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 (1.6 mm) of tread
remains. See When It Is Time for New Tires on
page 5-68.
5-59