Seen these tires before?

Those look awesome!!!! I have a customer that used to buy Yokohama AO32R's. They were wicked tread, and currently unavailable...luckly he has 2 new sets in his garage that he bought when he heard they were going to stop making them.
 
any body ever launced hard on a road race tire? Just curious? I know there is no sidewall, but thought it would be interesting if anybody has experience with them