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Tires and wheels
4
Production options weight
The combined weight of those installed
regular production options weighing over
5 lbs (2.3 kilograms) in excess of those
standard items which they replace, not
previously considered in curb weight or ac-
cessory weight, including heavy duty
brakes, ride levelers, roof rack, heavy duty
battery, and special trim.
PSI (P
ounds per Square Inch)
A standard unit of measure for air pres-
sure. Another metric unit for air pressure is
bar or kilopascal (kPa).
Recommended tire inflation pressure
Recommended tire inflation pressure list-
ed on the placard located on driver’s door
B-pillar for normal driving conditions. Pro-
vides best handling, tread life and riding
comfort.
Rim
A metal support for a tire or a tire and tube
assembly upon which the tire beads are
seated.
Side wall
The portion of a tire between the tread and
the bead.
TIN (T
ire Identification Number)
Unique identifier which facilitates efforts
by tire manufacturers to notify purchasers
in recall situations or other safety matters
concerning tires and gives purchases the
means to easily identify such tires. The TIN
is comprised of the “manufacturer’s identi-
fication mark”, “tire size”, “tire type code”
and “date of manufacture”.
Tire load rating
Numerical code associated with the maxi-
mum load a tire can support.
Tire ply composition and material used
This indicates the number of plies or the
number of layers of rubber-coated fabric in
the tire tread and side wall. Tire manufac-
turers also must indicate the ply materials
in the tire and side wall, which include
steel, nylon, polyester, and others.
Tire speed rating
Part of tire designation; indicates the
speed range for which a tire is approved.
Traction
Force exerted by the vehicle on the road
via the tires. The amount of grip provided.
Tread
The portion of a tire that comes into con-
tact with the road.
Treadwear Indicators
Narrow bands, sometimes called
“wear bars” that show across the tread of
a tire when only
1
/
16
in (1.6 mm) of tread
remains.