My grandpa used to be a Shriner many, many years ago. They didn't ride motorcycles but drove little go carts with molded car bodies on them like Mustangs and stuff. They did what looks like the same maneuvers as you guys do, just in go carts. It used to be my favorite part of the 4th of July Parade, watching Grandpa and his friends drive crazy circles all over everywhere with absolute precision. Good memories.
Scottie