The starting shot is fired not far from the borders with Austria and Slovenia, in Tarvisio. The first eleven kilometres are still the easy part and relatively flat.
Then it's up the incredibly steep Monte Lussari. After around one and a half kilometres up the mountain, the first section has a gradient of 22 percent, with another one waiting just 1000 metres before the end. The first five kilometres have an average gradient of 15 per cent, which can only be mastered in hairpin bends. This is followed by a small plateau with a gradient of just four per cent before the second extremely steep section. The last 850 metres are even downhill before the last 150 metres to the finish have another 16 per cent gradient. No wonder that this is another 1st category climb - also the last mountain classification of the tour. There are another 1050 metres of climbing to complete.
The split time is taken three times on the way. At kilometre 10.8 - before the climb. At kilometre 14.3 - about halfway up the climb. And at kilometre 17.8 - before the short climb and the absolute finale.
An unrivalled time trial will decide the outcome of the 2023 Giro d'Italia. Time trial specialists will not be fighting for the stage win, the flat part is too short, the mountain too difficult. Lightweights have the advantage, especially in the extremely steep sections.
Although most of the riders will probably change from a special time trial bike to a light mountain bike around the first split time, in the end it won't be the equipment that decides who wins and who loses, but only the legs after three exhausting weeks with sometimes adverse weather conditions in Italy.
At 11:30 Nicolas Dalla Valle, the last rider in the overall classification, will be the first to roll off the ramp, Geraint Thomas, the holder of the Maglia Rosa, at 17:14. Average speeds of between 25 and 29 kilometres per hour have been calculated, which means that riding times of between 45:46 and 37:47 minutes can be expected.
Eurosport will broadcast all stages of the Giro d'Italia 2023. The 20th stage will be shown free-to-air on Eurosport 1 from 11:15 am. Including post-stage coverage, the broadcast will run until 7pm. The paid providers GCN+ and Discovery+ will show a live stream on the internet from 10.45am.