Star on stock Bridgestone 18's?
 

Found a crack on my left rear tire last week that extended from the footprint down the sidewall. Berkeley McKevitt took care of the replacement no problem. One thing I just noticed however is that the new tire they put on (it was the left rear) has a star after "Potenza 040." Anyone know what this means as it's not on the other tires. Perhaps a non-OEM designation?