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196
Tires and wheels
Maximum loaded vehicle weight
means the sum of:
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity we ight, and
(d) Production options weight
Maximum (permissible) inflation pressure
means the maximum cold inflation pressu re
to which a tire may be inflated. Also called
"maximum inflation pressure."
Normal occupant weight
means 150 lbs. (68 kilograms) times the
number of occupants seated in the vehicle up
to the total seating capacity of your vehicle .
Occupant distribution
means distribution of occupants in a vehicle .
Outer diameter
means the overa ll diameter of an inflated new
tire.
Overall width
means the linear distance between the exter i-
ors of the sidewalls of an inflated tire, includ-
ing e levations due to labeling, decorations, or
protective bands or ribs.
Ply
means a laye r of rubber-coated
parallel cords.
Production options weight
means the comb ined we ight of those installed
regular production options weighing over 5
lbs . (2 .3 kg) in excess of those standard items
which they replace, not previously considered
in curb weight or accessory weight, including
heavy duty brakes, ride leve lers, heavy duty
battery, and special trim.
Radial ply tire
means a pneumatic t ire in which the ply cords
that extend to the beads are laid at substan-
tially 90 degrees to the centerline of the
tread .
Recommended inflation pressure
see ~ page 195, Cold tire inflation pressure.
Reinforced tire
means a t ire designed to operate at higher
loads and at higher inflation pressures than
the corresponding standard tire . Reinforced
ti res my be ident ified as "XL" "xl" "EXTRA
,
,
LOAD", or "RF" on the sidewall.
Rim
means a metal support for a tire or a t ire and
tube assembly upon which the tire beads are
seated.
Rim diameter
means nominal d iameter of the bead seat. If
you change your wheel s ize, you w ill have to
purchase new tires to match the new rim di-
ameter .
Rim size designation
means rim diameter and width.
Rim width
means nominal distance between rim flanges .
Sidewall
means that portion of a t ire between the
tread and bead.
Speed rating (letter code)
means the speed at which a tire is designed to
be driven for extended periods of time. The
ratings range from 93 mph (150 km/h) to
186 mph (298 km/h)
~
page 206 . You may
not find this information on all tires because
it is not requ ired by law.
The speed rating letter code, where applica-
ble, is molded on the tire sidewall and indi-
cates the max imum perm iss ible road speeds
~
A
in Winter tires on page 209 .
Tire pressure monitoring system
means a system that detects when one or
more of a veh icle's tires are underinflated
and
illuminates a low tire pressure warning tell-
tale.
..,_
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