DOT CODE WITH LETTERS
I just looked at a friend's trailer and the DOT code was R2NN. I AM only familiar with the numeral week/year code.
Forum Discussion
The DOT code is a 10 to 13 digit "number" on the sidewall of every tire that hits the street in the US.
I go into more detail here: http://barrystiretech.com/dotcoding.html
The complete DOT code only needs to be on one side, but a partial code is required for the other side - and that one will be 6 to 9 digits long.
Tires that do not hit the street are NOT required to have a DOT code, but many do, and they are NOT required to follow the DOT coding format. Sometimes the tire manufacturer will have its own coding system - as did even street tires prior to the early 1970's.
I go into more detail here: http://barrystiretech.com/dotcoding.html
The complete DOT code only needs to be on one side, but a partial code is required for the other side - and that one will be 6 to 9 digits long.
Tires that do not hit the street are NOT required to have a DOT code, but many do, and they are NOT required to follow the DOT coding format. Sometimes the tire manufacturer will have its own coding system - as did even street tires prior to the early 1970's.
