The Texan said the response to the Queensland floods was inspired compared to the situation his Louisiana "neighbours" were faced with after Hurricane Katrina in 2005.
"If there's anything cool about this, and there's not many cool things that happen here in terms of this disaster, (it) was the way that the Australian people rallied around Queensland," he told the crowd before the ride.
"When I heard, and I don't know if this is true ... that there were traffic jams coming into the city because people wanted to come and help and volunteer, you know what that is?
"That's a whole lot of heroes the whole world needs to pay attention to and copy that.
"I can tell you, having lived in the United States and having watched (Hurricane) Katrina closely, there were no traffic jams going into New Orleans.
"So for you guys to step up like that, is unbelievable."
