What does the date code say?
IIRC, "blue label/non sticky" 39 krawlers were a special run just for Ultimate Adventure or something like that?
35 and 37 blue labels are/were common
I think JohnG had a set of blue label 39s on 38 special at some point? maybe
Both sets of reds I had were hard as a preachers ****, but gripped like Jenna Jameson at a **** measuring contest.Can you feel a difference in the softness of the tread?