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Tire Markings
Section Width
- This number gives the width of the tire in inches; the larger the number, the wider the
tire. (The markings on the example tire diagram show 4.80. The markings on your tire may differ.)
Inner Diameter
- This number gives the inner diameter of the tire in inches. This is also the rim
diameter in inches. (The markings on the example tire diagram show 12. The markings on your tire
may differ.)
U.S. DOT Tire Identification Number
- This begins with the letters DOT and indicates that the tire
meets all federal standards. The next two numbers or letters are the plant code where it was
manufactured, and the last four numbers represent the week and year that the tire was built. For
example, the numbers 2107 mean the 21st week of 2007. Any other numbers used are marketing
codes used at the manufacturer’s discretion. This information is used to contact consumers if a tire
defect requires a recall.
Maximum Load Rating
- This number indicates the maximum load in kilograms and pounds that can
be carried by the tire.
Load Index
- This is a measurement of how much weight each tire can support. See Table A below.
(The markings on the example tire diagram show 71. The markings on your tire may differ.)
Note:
You may not find this information on all tires because it is not required by law.
Speed Rating
- The speed rating denotes the speed at which a tire is designed to be driven for
extended periods of time. This does not indicate that the vehicle or rims can safely reach or maintain
that speed
.
These ratings are listed in Table B. (The markings on the example tire diagram show M.
The markings on your tire may differ.)
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