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So from April, 2015 to April, 2025, you will see both 2 digit and 3 digit plant codes - and the existing plant codes COULD use a "1" (One) in front. If you look to the right, the plant code for the DOT number would be 5M.
Here's a web site that has an old version of the plant codes: From time to time, this gets updated, but don't depend on this being 100% right.
), but it also created problems with dirt and foreign objects in the bottom half of the mold.
So they have petitioned NHTSA to change this requirement.
Starting in 2008, the full DOT code (with the date code) was supposed to be on the side intended out.
It is fairly common for everything except the date code to be on both sides, with the date code only being on one side.I have updated the web page to reflect those changes.The first 2 or 3 digits are a code for the manufacturing plant.Also do not assume that everyone uses this coding system.I am aware that many European based tire manufacturers use a different system.
So if you look "5M" on the web site linked above you should get Bridgestone in Sao Paulo, Brazil.