Dual slalom is an older mountain bike racing discipline similar to 4x racing. It consists of two racers racing two almost identical tracks next to each other down a slope. The courses are usually short; one run lasting about 30 seconds. Both riders' times are taken and then they switch tracks for another round, whereafter the combined times are counted and slowest rider is eliminated. The winner moves on to the next round until they have 2 riders left racing in the final.