NT01s 255/40/17 with 2 wet weekends (MSRH & MSRC), 1 dry weekend (MSRH) and a final dry weekend at COTA.
COTA was a 3 day weekend with the PCA. Sunday morning after my first session I noticed these weird "ripples or bumps" on the outside of the front tires. Being the last day, I decided to send it. 2nd session of the day was my fastest all weekend and upon inspection after that session the tires seemed the same as the 1st session. After 40 minutes of the 3rd session, which was a whopping 1.5 hours of track time available, I came in to check the tires as they became very greasy. That's when I found them in this state, cording in the valleys of those ripples.
Asking a few others around the paddock, the general consensus was that the valleys are where the two tread blocks meet. However, this is my third set of NT01s and I have never corded them in this fashion.
Alignment wise up front is -3.5 camber with 0 toe.
Anyone ever seen this type of wear before?