SKU 42708
For technical questions, please call 1-800-444-3353.
REV 07f, 09b, 09g
TiRE inFoRmaTion
Tire Terminology Glossary
accessory weight means
•
- the combined weight of auto-
matic transmission, power steering, power brakes, power
windows, power seats, radio, and heater, to the extent that
these items are available as factory-installed equipment.
Carcass means
•
- the tire structure except for the tread which
provides the major portion of the tire’s capability to deflect in
response to the vertical loads and tractive forces that the tire
transmits from the roadway to the non-pneumatic rim, the
wheel center member, or the vehicle and which attaches to
the vehicle or attaches, either integrally or separably, to the
wheel center member or non-pneumatic rim.
Carcass separation means
•
- the pulling away of the carcass
from the non-pneumatic rim or wheel center member.
Chunking means
•
- the breaking away of pieces of the
carcass or tread.
Cracking means
•
- any parting within the carcass, tread, or
any components that connect the tire to the wheel center
member.
Curb weight means
•
- the weight of a motor vehicle with
standard equipment including the maximum capacity of fuel,
oil, and coolant, and, if so equipped, air conditioning and
additional weight optional engine.
Load rating means
•
- the maximum load a tire is rated to
carry.
maximum loaded vehicle weight means
•
- the sum of:
Curb weight;
a.
Accessory weight;
b.
Vehicle capacity weight; and
c.
Production options weight.
d.
maximum tire width means
•
- the greater of either the linear
distance between the exterior edges of the carcass or the
linear distance between the exterior edges of the tread, both
being measured parallel to the rolling axis of the tire.
normal occupant weight means
•
- 68 kilograms times the
number of occupants.
occupant distribution means
•
- distribution of occupants
in a vehicle.
Production options weight means
•
- the combined weight
of those installed regular production options weighing over
2.3 kilograms in excess of those standard items which they
replace, not previously considered in curb weight or acces-
sory weight, including heavy duty brakes, ride levelers, roof
rack, heavy duty battery, and special trim.
Tread means
•
- that portion of the tire that comes in contact
with the road.
Tread separation means
•
- pulling away of the tread from
the carcass.
Vehicle capacity weight means
•
- the rated cargo and lug-
gage load plus 68 kilograms times the vehicle’s designated
seating capacity.
Vehicle maximum load on the tire means
•
- that load on
an individual tire that is determined by distributing to each
axle its share of the maximum loaded vehicle weight and
dividing by two.
Vehicle normal load on the tire means
•
- that load on an
individual tire that is determined by distributing to each axle
its share of the curb weight, accessory weight, and normal
occupant weight and dividing by 2.
Tire markings
Load index and
Speed rating*
European tire
certificate*
U.S. DoT tire
identification
number
*information not required by U.S. DoT
inner diameter
in inches
Section width
in inches
Trailer
tire
maximum
load rating
Tire ply
composition
and materials
used
maximum
permissible
inflation
pressure
