First of all, hats off to those who do it with muscle .... starting from Croce d'Aune it is a relentless climb for about 11km with gradients ranging from 8 to 12%. With le-bikes you can alternate the first and second level of assistance (eco and tour for those with a Bosch engine) I never needed to go further. What can I say .... compared to what I had read of clean "earth" there is little. Most of the route is on a very stony and narrow old military road, almost a mule track. The stones are more annoying uphill than downhill, where if you give up a little, you can ride the bike better. The first section is in the middle of the woods, cool. It increases the emotion Waiting for the passages exposed. The second stretch is uncovered and very often exposed. The passages on the ridge are however "safe" because the mule track is wide, but beware of the numerous stones that can make you change direction when you are uphill if you do not manage the weight well. I had read the last section that it left more breathing room because it is less pending but perhaps it is the one that pulls the most .... at least along the path I have made.
The descent is beautiful. Obviously, to gain safety and perception of the same, it is better to go down the side opposite the precipices, but although I was very scared because for fear of dizziness, it is enough to give up a little to gain in trajectory stability as long as you manage the weights well by unloading on the pedals and standing back on the saddle in a dynamic and never rigid position. In short, the ebike helps us a lot to go up, but to go down it takes a minimum of technique in this case, so keep that in mind.
Attention also to the various uphill cyclists and hikers .... many stop and indulge you to let you pass perhaps on the "protected" side, others like pedestrians stay where they are. Have fun