Pontiac 2004 GTO User Manual
Page 247
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 cold
inflation pressure to which a tire may be inflated.
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 4-30.
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
shown on the tire placard. See Inflation - Tire Pressure
on page 5-58 and Loading Your Vehicle on page 4-30.
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.
Tread Width: The width of the tire’s tread.
5-57