From @Eshnar's excellent 2022 Giro d'Italia: Stage-by-stage Analysis thread: https://forum.cyclingnews.com/threads/2022-giro-ditalia-stage-by-stage-analysis.37819/#post-2691560
Stage 4: Avola – Etna 170 km
Tuesday, May 10th, 12:25 CET
Technical Overview:
The race enters Italy through Sicily, which means it is time for the mandatory Etna stage. We start from Avola this time, on the east coast, and proceed to work our way inland on a rolling terrain, slowly ascending for the first 53 km and then descending for 30 km. This is followed by another 50 km of mostly flat roads to approach the volcano, after which the riders will start climbing. The first 12 km of ascent are little more than a false flat and feature the two intermediate sprints of Paternò and Biancavilla, where the final climb officially starts. Etna (GPM1, 22.8 km at 5.9%) is to be climbed from yet another road, which has pretty much the same numbers as all the others: it is a long and consistent climb, without steep ramps.
Final km:
The Climbs:
Etna: GPM1, 22.8 km at 5.9%
For what feels like the 100th time, Etna again, and from a new road, again. Well, not entirely new. Part of this road is the same as 2018. There is an 8.7% section, ending at around 6 km to go, that would be the best place for an attack, but it depends on how windy it is.
What to expect:
The GC riders to get to the front and look menacingly at each other, like it happens often here.
Mount Etna
Stage 4: Avola – Etna 170 km
Tuesday, May 10th, 12:25 CET


Technical Overview:
The race enters Italy through Sicily, which means it is time for the mandatory Etna stage. We start from Avola this time, on the east coast, and proceed to work our way inland on a rolling terrain, slowly ascending for the first 53 km and then descending for 30 km. This is followed by another 50 km of mostly flat roads to approach the volcano, after which the riders will start climbing. The first 12 km of ascent are little more than a false flat and feature the two intermediate sprints of Paternò and Biancavilla, where the final climb officially starts. Etna (GPM1, 22.8 km at 5.9%) is to be climbed from yet another road, which has pretty much the same numbers as all the others: it is a long and consistent climb, without steep ramps.
Final km:

The Climbs:
Etna: GPM1, 22.8 km at 5.9%
For what feels like the 100th time, Etna again, and from a new road, again. Well, not entirely new. Part of this road is the same as 2018. There is an 8.7% section, ending at around 6 km to go, that would be the best place for an attack, but it depends on how windy it is.

What to expect:
The GC riders to get to the front and look menacingly at each other, like it happens often here.

Mount Etna