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DOT ratings for tyres

I will soon need new tyres so have been looking at some of the tyre manufacturers websites. None of the ones that I looked at gave any information on DOT Quality Grades for their tyres; Treadwear, Traction(A,B,C), or Temperature(A,B,C) What is going on ?

http://www.tirerack.com/
is a good place to get that info and more.

www.carbibles.com is another good site for information on tire markings.