Alto del Guamo

Overview

Alto del Guamo is a long-haul category 1 climb that rewards patience over punch. Across 30.5 km it lifts you from a valley floor at 909 m to a summit of 2328 m — a net elevation gain of 1419 m. On paper the 4.65% average gradient reads as gentle, and for stretches it genuinely is. But the total ascent of 1525 m tells a subtler story: more climbing happens than the net figure suggests, meaning the road gives a little back before demanding it again. This is a climb defined by its length and its slow, relentless accumulation of altitude rather than by any single savage wall.

How the Gradient Unfolds

The defining tension of Guamo is the gap between its 4.65% average and its 15.03% max. That is a wide spread, and it means the climb is not uniform. A steady 4.65% for 30.5 km would be a rhythm you could hold in the saddle almost indefinitely; instead, the true gradient swings above and below that mean. The difference between the 1525 m of total ascent and the 1419 m of net gain — 106 m — confirms there are dips and false flats folded into the profile, short reprieves where the road eases or even tilts down before resuming the climb. The 15.03% pitches are the moments that break an otherwise metronomic tempo, forcing you out of your seated cadence and into a harder, shorter effort before the grade relents again.

Pacing Notes

On a climb this long, discipline beats bravado. Anchor your effort to your sustainable power rather than the terrain: riding just under your FTP on the shallower sections lets you absorb the 15.03% ramps without blowing apart. If you do not know your threshold, run the numbers through the FTP estimator before you start, then set a ceiling you can hold for the better part of an hour or more. Because the average is only 4.65%, the temptation is to overcook the easy kilometres early — resist it. The 1419 m of vertical you still have to climb after the first ramps will punish anyone who spent their matches on the friendly grades near 909 m.

Gearing

The steepest 15.03% sections are what dictate your gearing here, not the modest average. On a 30.5 km climb with pitches this steep, you want a bailout gear that lets you spin rather than grind. A compact 34-tooth chainring paired with a 34×32 low end will cover most riders through the hardest ramps while keeping cadence civil. If you are carrying fatigue from the sheer length, or you simply prefer to twiddle up the 15.03% walls, drop to a 34×34 — the extra range turns those pitches from a slog into something you can ride seated and controlled all the way to 2328 m.

Summary

Alto del Guamo is a test of endurance and pacing: a long, mostly steady ascent stitched together by short steep interruptions, all adding up to a serious day in the mountains.

Length: 30.5 km
Average gradient: 4.65%
Max gradient: 15.03%
Start: 909 m
Summit: 2328 m
Net gain: 1419 m
Total ascent: 1525 m
Category: 1