At 01:46 AM 4/28/2004, Phil Ethier wrote:
>What is the current code for deciphering the date of birth for a DOT tire?
Last four digits of the TIN:
First two digits of the last four are the week. Second two digits are the
last two digits of the year.
For a tire made in the second week of January 2004 . . . "0204"
See last item below.
2. Tire Identification Number (TIN)
Section 574.5 of Title 49, CFR, Tire Identification Requirements, sets
forth the methods by which new tire manufacturers and new tire brand name
owners must identify tires for use on motor vehicles. The section also sets
forth the methods by which tire retreaders and retreaded tire brand name
owners must identify tires for use on motor vehicles. The purpose of these
requirements is to facilitate efforts by tire manufacturers to notify
purchasers of defective or nonconforming tires and by such purchasers to
identify those tires so that purchasers can take appropriate action in the
interest of motor vehicle safety.
Specifically, '574.5 requires each new tire manufacturer and each tire
retreader to mold a TIN into or onto the sidewall of each tire produced, in
the manner and location specified in the section and as depicted in Figures
1 and 2 of that section. The TIN is composed of four groups:
* The first group represents the manufacturer's identification mark
assigned to such manufacturer by this agency in accordance with '574.6;
2. The second group represents the tire size for new tires; for
retreaded tires, the second group represents the retread matrix in which
the tire was processed or, if no matrix was used, a tire size code;
* The third group may, at the option of the manufacturer, be used as a
descriptive code for identifying significant characteristics of the tire.
If the tire is produced for a brand name owner, the third grouping must
identify such brand name owner; and
* The fourth group identifies the week and year of manufacture. The
first two figures identify the week, starting with "01" to represent the
first full week of the calendar year; the second two figures represent the
year. For example, "2198" represents the 21st week of 1998.
Dick Rasmussen
CM 85
85 Van Diemen FF
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