3. Two-digit number (60): This number,
known as the aspect ratio, gives the
tire’s ratio of height to width.
4. Three-digit code: Tire type code
(Optional)
5. Three-digit code: Date of Manufacture
4. R: The “R” stands for radial.
5. Two-digit number (16): This number is
the wheel or rim diameter in inches.
6. Four numbers represent the week and
year the tire was built. For example, the
numbers 3103 means the 31st week
of 2003. If these numbers are missing,
then look on the other sidewall of the
tire.
6. Two- or three-digit number (94): This
number is the tire’s load index. It is a
measurement of how much weight
each tire can support. You may not find
this information on all tires because it
is not required by law.
7. H: Tire speed rating. You should not
drive the vehicle faster than the tire
speed rating.
3
Tire ply composition and material
᭺
The number of layers or plies of
rubber-coated fabric in the tire.
Example
Tire manufacturers also must indicate
the materials in the tire, which include
steel, nylon, polyester, and others.
2
᭺
TIN (Tire Identification Number) for a
new tire (example: DOT XX XX XXX
XXXX)
4
᭺
Maximum permissible inflation pres-
sure
1. DOT: Abbreviation for the “Depart-
ment of Transportation”. The symbol
can be placed above, below or to the
left or right of the Tire Identification
Number.
2. Two-digit code: Manufacturer’s identi-
fication mark
3. Two-digit code: Tire size
This number is the greatest amount of
air pressure that should be put in the
tire. Do not exceed the maximum per-
missible inflation pressure.
5
Maximum load rating
᭺
This number indicates the maximum
load in kilograms and pounds that can
8-30 Maintenance and do-it yourself
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