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Page 17For technical questions, please call 1-800-444-3353.Item 42708
TIRE INFORMATION
Tire Terminology Glossary
• Accessory weight means- the combined weight of
automatic 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 deect
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:
a. Curb weight;
b. Accessory weight;
c. Vehicle capacity weight; and
d. Production options weight.
• 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 accessory 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 luggage 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
certicate*
U.S. DOT tire
identication
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
ination
pressure