TOOELE VALLEY, UTAH (September 19, 2012) — The Ultra4 American Rock Sports Challenge returns to Miller Motorsports Park this Friday and Saturday, September 21-22, bringing one of the most unique off-road events ever seen in Utah back for a second consecutive year.

Ultra4 Racing grew out of a now-legendary off-road race called King of the Hammers, which was the result of a bet six years ago that culminated in a race for bragging rights and a case of beer among 13 friends. The King of the Hammers, held annually in Johnson Valley, California, combines two of the most popular forms of off-roading – rock-crawling and high-speed off-road racing. That one epic race has now resulted in the Ultra4 Pro Racing Series, a three-race championship that includes the Ultra4 American Rock Sports Challenge at Miller Motorsports Park.