The climb from Achern to Mummelsee and Hornisgrinde is approximately 16.3 kilometers long and has an elevation gain of approximately 881 meters. The gradient in the lower section is 10 to 14 percent up to an elevation of approximately 800 meters. After that, it becomes considerably flatter.
The climb to the summit of Hornisgrinde is 2.1 kilometers long and has an elevation gain of approximately 139 meters. The gradient is 10 to 11 percent. You can ride all the way to the summit (1164 meters), which is paved.
The total elevation gain from Achern is approximately 1020 meters, with a total length of approximately 18.4 kilometers. Up there, you'll enjoy a magnificent view. The climb is definitely worth it.