Here's an excerpt from one of the Australian riders in the USA Butt Lite competition recently finished:
"I still need new tires, which they did not have, as the Michelins we put on Martin's bike (Road Pilot 4's GT) seem to be the best option, and they are so popular, that they sell out whenever they come into the shops."
These are guys doing over 1000 miles per day for several days.