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@andyp
It is partly the gradient, it averages 13% for 6 kms, but also partly the heat as it starts from quite low down so the heat tends to be higher later in the day.
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Both sides of the Stelvio are worth doing, it's just that the north side is famous because of the 47 hairpins. The southern side is also epic, with a hairpinned section and quite a few unlit tunnels.
Which reminds me, it's best to take a small rear light with you as both the Stelvio and the Gavia have sections of unlit tunnels.