The narrow road meanders in the lower section through Casteletto. Here it is sometimes quite steep, i. at smaller ramps quite a time 17, 18%, too. Since the road is so narrow, it is only one lane with traffic lights for cars passable. As a cyclist you can safely ignore, you should only pay attention to oncoming traffic and the locals are not squeamish there ...
In the further course then follow some sweeping, which are already more pleasant to drive with 8 - 10%. Already here, great views of the lake open up to the northern tip.
The last section is the lightest. Here it is with some small curves relatively evenly uphill to San Zeno. It is hardly two digits here.