O 3 Schulenberg Circuit
Moderate tour through forests with a longer climb to the Schalke and good viewpoints | many short single trail passages | technically moderate| passes through Schulenberg and Clausthal-Zellerfeld ...
O 10 Grand Upper Harz Circ...
Very difficult mountain and valley tour with frequent changes between gravel tracks and asphalt | noumerus single trail passages, some technically difficult | 2 short country road sections | 3 main road crossings! | ...