i based that comment on merely an eyeball observation. ive had prostars crack on me, and im very cautious after that.
the rims are sitting at a friends shop and i wont be seeing them until spring.
I had similar ultra light HoleShot brand wheels crack with street use. I think that the lateral forces of turning, combined with rougher roads than the track, contributed to the eventual cracking and failure. I'd be SUPER cautious using a super light race wheel for primarily street driving.