T I R E S A N D W H E E L S
T H O R M O T O R C O A C H | M A D E T O F I T
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safercar.gov
TIR
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Tire Labeling
RIM DIAMETER CODE:
This two-digit
number is the wheel or rim diameter
in inches.
LOAD INDEX:
This two- or three-digit
number is the tire’s load index. It is
an indicator of how much weight
each tire can support. Note: You may
not find this information on all tires
because it is not required by law.
R:
The “R” stands for radial. Radial tires have been
the industry standard for the past 20 years.
P or LT:
The “P” indicates the tire is for
passenger vehicles. “LT” indicates the
tire is for light trucks.
NOMINAL WIDTH:
This three-digit
number gives the width of the tire
in millimeters from sidewall edge
to sidewall edge. The larger the
number, the wider the tire.
MAXIMUM LOAD RATING:
This
number indicates the maximum
load the tire can carry.
MAXIMUM PERMISSIBLE
INFLATION PRESSURE:
This number
is the greatest amount of air pressure
that should ever be put in the tire. This
is NOT the same as the vehicle manufac-
turer’s recommended tire pressure.
TEMPERATURE:
The temperature rating
indicates how well the tire resists heat.
ASPECT RATIO:
This two-digit number gives
the tire’s ratio of height to width. A number of
50 or lower indicates a short sidewall for improved
steering response and better overall handling.
TRACTION:
The traction rating indicates the tire’s
ability to allow a car to stop on wet pavement in a
shorter distance.
TREADWEAR:
The treadwear rating indicates how long the
tire should last. The higher the number, the longer it should
take for the tires to wear down.
SPEED RATING:
The speed
rating tells you the maximum
speed capability of a tire. The
speed ratings include speeds
from 99 mph to above 186
mph. Note: You may not find
this information on all tires
because it is not required by
law.
M+S:
This indicates that the tire
has some mud and snow capability.
U.S. DOT TIRE IDENTIFICATION
NUMBER:
This number begins with
the letters “DOT” and indicates that
the tire meets all Federal standards.
The next two or three numbers or
letters are the plant code where the
tire was manufactured. The last four
numbers represent the week and
year the tire was built. For example,
the numbers 3107 means the 31st
week of 2007. The other numbers are
marketing codes used at the manu-
facturer’s discretion. This information
is for contacting consumers if a tire
defect requires a recall.
If Tire Labels Could Talk, Here’s What They’d Say
There’s a ton of information on your tires that tells you about how they work
with your vehicle to affect its performance. Understanding the tire labels for
your passenger vehicle or light truck is important for maintaining and buying
new tires. If labels could talk, here’s what they’d say:
R:
P or LT:
NOMINAL WIDTH:
MAXIMUM LOAD RATING:
MAXIMUM PERMISSIBLE
INFLATION PRESSURE:
TEMPERATURE:
ASPECT RATIO:
TRACTION:
TREADWEAR:
U.S. DOT TIRE IDENTIFICATION
NUMBER:
M+S:
SPEED RATING:
LOAD INDEX:
RIM DIAMETER CODE:
Illustration courtesy of NHTSA,
www.safercar.gov
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