Those pictures remind me of the tires on T-38s, that always seem to have raggedy white threads visible on them. Having never actually flown a T-38 (but been up close and personal often), it's my understanding that because the airplane has weak brakes the landing protocol of bringing the nose down pretty late in the rollout wears the tires out fast. At a certain degree of wear, the visible threads change from white to red and then it's time to change the tires.
If I'm mistaken, hopefully someone more knowledgable will correct me.
Thanks.