For the umpteenth time, THIS IS NOT TIRE WEAR.
This is your OEM Michelin tire DEFECT. The tires come apart internally and this is how it manifests, which occurs next to never with the exact same suspension and the OEM Pirelli 19" tires . . . .
Your replacement tires should have been FREE, as mine were, as this is a SAFETY DEFECT from poor tire design and/or poor tire manufacturing quality:
A. Nearly impossible to visually discover due to location.
B. Potentially fatal failure should it come apart completely during very high speed driving.
It would not be the first time it's happened, but back then it only killed a few hundred people; let's not wait to see who will be killed with these Michelin tire failures, shall we?
en.wikipedia.org
Please help save someone's life in the years ahead by adding your complaint and photo to the large pile stacking up at NHTSA, and then see about getting the $1k back from Michelin (which may now be more difficult since you no longer have the tires to return to Michelin?):
1.
Report a Safety Problem | NHTSA
2.
Michelin Tire Support & Michelin Customer Support | Michelin
Please keep us posted.
Thanks.