Tyre dating marks

So the plant code to the right is "B6" = Michelin in Spartanburg, SC, USA - and the size code is "D0" = 175/65R13 - and the exact tire is identified by "A83X" The format is week/week/year/year or week/week/year. Starting in the year 2000, the date coding used was 4 digits. 19 are transition years, so you will find both 3 and 4 digits used in tires produced in that time frame.

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The Rubber Manufacturers Association, a US based industry group that represents folks who manufacture things out of rubber (and tires are a major player in this group), has published a suggested list of codes: RMA Size Code Manual Please note: This manual also gets updated from time to time, so don't assume this version is 100% accurate either.

Also do not assume that everyone uses this coding system.

While it may be true that all Michelin tires have an "X" in the type code, it is NOT true that Michelin is the only one who uses an "X" in the type code.

Editorial Comment: One of the reasons I did this web site is because of things just like the photo to the right - Misinformation!

The first 2 or 3 digits are a code for the manufacturing plant.

Prior to April of 2015, all plant codes were 2 digits, but after April of 2015, a third digit was permissible, and 3 digits are required by April of 2025.

It is fairly common for everything except the date code to be on both sides, with the date code only being on one side.

Starting in 2008, the full DOT code (with the date code) was supposed to be on the side intended out.

First number is the number of bolts (in our case 5).

The number 112 indicates the so-called PCD (Pitch Circle Diameter) which is the diameter of an imaginary circle drawn through the center hole of the screws on which the wheel is mounted.

I am aware that many European based tire manufacturers use a different system.

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