The StoppOmat Rönkhausen is the attraction for anyone who wants to show who is the best road cyclist on the mountain. From mid-March to mid-October, racing cyclists can test their form here and compete virtually or directly against each other for the fastest time. The 4.5-kilometre course with 250 meters of elevation gain shows who has the most stamina. The route leads from the lower reservoir of the Pumpspeicherwerk Rönkhausen to the upper reservoir. The principle of the StoppOmat is very simple: you take a stamp card, ride the route and insert the card back into the machine at the finish. The time is thus taken - and the result is then published on the Internet. This principle makes it possible to make comparisons throughout the season.