Passo dello Stelvio

The Stelvio is the highest paved pass in Italy and the second highest in the Alps. Most photographs of it are taken from the other side — the wall of forty-eight numbered hairpins stacked above Prato. The Bormio ascent is the quieter one, and the harder one to read.

It starts in the Valdidentro at 1,281 metres and climbs for twenty-one kilometres through a series of rock tunnels cut into the gorge above the Braulio. There is no sustained wall here and no single defining ramp. Instead the gradient sits between seven and eight per cent for most of an hour, relents for three kilometres near the top where the valley opens out, and then delivers its steepest kilometre at nineteen — a ten per cent pitch at 2,500 metres, where the air has already thinned enough to matter.

That shape is why it rewards a frame built for the rider rather than for the mountain. Nothing about the Bormio side punishes weight the way the Mortirolo does. What it punishes is a frame that wastes what you put into it over ninety minutes of seated tempo.