The 74 signposted mountain bike routes have three different degrees of difficulty (following the ADFC - German Cycling Federation - scheme). In the Harz, many fairly short routes include steep ascents and are therefore classified in a higher category.
Easy mountain bike route
20 to 40 km or up to 500 hm (altitude metres)
Medium mountain bike route
40 to 60 km or 500 to 900 hm (altitude metres)
Difficult mountain bike route
60 to 90 km or more than 900 hm (altitude metres)