Biggest Gravel Event Around, Dirty Kanza, Rebranded as ‘Unbound’Dirty Kanza, The Dirty, DK, it went by a few names, but it was, or is, the biggest gravel racing event in the land. Founded in 2006, the race bounds over short, flowing hills in Kansas (yes, they exist) and attracts riders from around the world. The company that owns the race, Life Time, bought it last year. After Cummins was dismissed, a clamor arose among riders and activists that the name Dirty Kanza ought to be changed. Unbound Gravel is the new name.