P-Biel/Solothurn/Biel (81km)

Good route (but i won't repeat, due to off-road part). First 45km are not difficult, area around Solothurn is not the most funny (too many people and cars around...) then it starts lovely part of the route. The climb after Solothurn is very nice, but around km 53-57 it's off-road and you need at least a gravel bike to complete, especially the downhill is not easy; after (km 61) there is 1.5km climb in Bettlach: it's really hard and definitely the most difficult of the route; then 2km climb in Grenchen; last climb 2km in Safnern is also difficult because it comes at the end. Amazing countryside with a view of the mountains.