Thank you, everybody.
I had just checked the Psi, which was 29 and 33. This is the combo I've always used for Sport Demons. Most of your comments confirm what I suspected, with the cold + new tire. Although I'm beside myself at how easy it happened on such a routine turn, I suppose no one ever plans to wreck.
Am I understanding your comment correctly, @
csmith12, that the last image shows a tire arc that is likely too tight? One thing I didn't expect is that the scuff on the side of the tire follows the circumference of the whole thing. I don't know if that means anything, just an observation I didn't expect.
What kind of a degreaser is suggested? I'll definitely wash the tires, AND hit with some sandpaper for good measure!