Nagybörzsöny (209 m.n.m.) -> Nagy Hideg-hegy (846 m.n.m.) -> Nagybörzsöny
Quite a hard track but on the other hand very good. Hilly terrain on unpaved road changes in about 2/3 of ascending so you have to walk your bike instead of riding it :-).
Downhill from Hideghegy to Nagyborzsony takes about 40-45 minutes and it is a bit tricky as you have to take in mind that some parts of the road are a bit devastated by foresty workers.