There are several ways in which to classify the difficulty of mountains. Climbbybike has developed its own formula, in an effort to reflect the most important aspects
in a well-weighted manner, the climbbybike difficulty index.
Whereby the principles followed working out the Formula (proceeding from the old well-known elaboration: D=(P*P*L)/10 + 4*P) are four:
The Scanuppia Malga Palazzo in Italy. One of the most difficult climbs in Europe according to all formulas.
The Pico de Ariero on the island of Madeira (Portugal), one of the hardest.
The profile of the Mount Washington in the United States (New Hampshire). The hardest in the States, together with Mount Haleakala on Hawaii.
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