RAGBRAI is an acronym for Register's Annual Great Bicycle Rie Across Iowa. It is a non-competitive bicycle ride across Iowa that draws recreational riders from across the United States and overseas. The ride from a community on Iowa's western border to a community on Iowa's eastern border, stopping in towns across the state. RAGBRAI is limited to 8,500 week-long riders and 1,500 day riders. Estimates of unregistered riders vary greatly anywhere from three to ten thousand.