Home of the King of the Hammers race, the world's toughest one-day off-road race. Combines rock crawling and desert racing in 4400 class (unlimited) and multiple spec classes.
Ultra4 Racing was founded in 2007 and is best known for King of the Hammers, staged annually in Johnson Valley, California. KOH is widely described as the world's toughest one-day off-road event, combining desert racing with technical rock crawling. The 4400 Unlimited class features tube-chassis vehicles with up to 800 horsepower. Ultra4 also sanctions regional series across North America and Europe.
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