Best hard trails in Frankfurt

After cycling comfortably through the super flat plain of the Oder valley, the ridge on the edge of the valley appears behind Plawidlo in the direction of Golice. In front of the cyclist, a long, rather steep cobblestone street appears like a wall. Only on the left edge of the road does a narrow path lead next to the cobblestone pavement and bring some calm to the difficult ascent. Then it's done, it doesn't get any more difficult on this circuit. On the way you could swim in Stare Biskupice...