Wirbeljet (8B) is in my opinion one of the best 8B boulders in the Frankenjura. It's location is unique and nice. The holds and the rockquality convince. The moves are fun and it has an obvious start and top, which isn't self-evident in the Frankenjura. The icing on the cake: it's always shady and therefore guarantees good conditions even when it's sunny and warm. Overall a perfect spot for hard bouldering.