Collado Guayes

Overview

Collado Guayes is a long, patient climb that rewards riders who respect its length. Stretching 20.6 km from a start elevation of 433 m to a summit of 1474 m, it delivers 1041 m of net elevation gain and 1037 m of total ascent. The near-identical net and total figures tell you something important: this is a climb that almost never gives back what it takes. There are no meaningful descents or false flats to break the rhythm — once you start climbing, you keep climbing.

At 20.6 km it earns its category 1 rating not through savage steepness but through sustained effort. The 5.06% average gradient is moderate on paper, yet holding it for the better part of an hour is a different challenge entirely.

How the Gradient Unfolds

The defining number here is the gap between the 5.06% average and the 8.1% maximum. That spread of roughly three percentage points means the climb is remarkably consistent. There are no wall-like pitches to shatter your legs, but there is no rest either. The steepest sections at 8.1% are hard enough to make you shift down and stand, yet they never spike into the double digits.

Spread 1041 m of climbing across 20.6 km and you get a road that simply tilts upward and stays there. Expect the gradient to hover close to the average for long stretches, with the harder ramps arriving as short, honest tests rather than surprises.

Pacing Notes

On a climb this long, discipline beats bravado. Your FTP is the number that matters most here — aim to sit just below it for the full 20.6 km rather than surging on the 8.1% ramps and paying for it later. A steady effort that feels almost too easy in the opening kilometres is exactly right, because the climb's length will extract its toll regardless.

If you are unsure of your threshold, run the numbers through the FTP estimator before you ride. Knowing your ceiling turns a 5.06% average into a manageable, repeatable target instead of a guess. Fuel early and often; the summit at 1474 m is a long way from the 433 m start.

Gearing

Sustained gradients demand gearing that lets you spin rather than grind. For most riders a compact 34-tooth inner chainring paired with a wide-range cassette is the right call. A 34×32 will handle the 5.06% average comfortably, keeping your cadence high across the long middle section.

For the 8.1% pitches, or if you are carrying fatigue from earlier climbing, drop to a 34×34. That extra rescue gear costs nothing on the flatter stretches and buys you a lifeline when the gradient bites. Over 20.6 km and 1041 m of gain, protecting your knees and cadence is always worth it.

Summary

Collado Guayes is a climb of endurance rather than explosive power — long, steady, and unrelenting across its full 20.6 km. Pace it with your threshold in mind, gear generously, and let the consistent 5.06% average work with you instead of against you.

Length: 20.6 km
Average gradient: 5.06%
Max gradient: 8.1%
Start: 433 m
Summit: 1474 m
Net gain: 1041 m
Total ascent: 1037 m
Category: 1