Collado Eriste

Overview

Collado Eriste is a hors-catégorie (HC) climb in Spain, running 14.4km from a valley start at 1,138m to a summit at 2,444m. The net elevation gain is 1,306m at an average gradient of 9.1%, which puts it firmly among the hardest sustained climbs a rider can take on. There is nowhere to hide on a climb of this length and pitch — the category is earned by both the distance and the relentless steepness stacked on top of it.

The number that reframes the effort is the total ascent: 1,968m against a net gain of 1,306m. That 662m gap means the road does not climb cleanly — it undulates, giving back roughly 662m of descent that you then have to reclaim. Every metre you coast down is a metre you pay for again. Treat the 9.1% average as an accounting figure, not a description of what your legs will feel, because the real climbing pitches are steeper than the average implies.

How the Gradient Unfolds

The 9.1% average is diluted by the descents and flatter breaks folded into the profile. Strip those out and the true climbing sections bite harder. Expect the effort to arrive in surges rather than as one steady wall.

• Flatter or descending recovery sections where the road gives back elevation — do not spend matches here
• Repeated short climbs that force you to re-accelerate after each dip
• The steepest ramps, where the gradient jumps well above the 9.1% average and demands your lowest gear

Pacing Notes

On an undulating climb like this, even-effort pacing beats even-speed pacing every time. Chasing a constant speed forces you to over-power the steep ramps and waste energy on the flatter sections. Instead, anchor your effort to your sustainable power output and hold it steady across the surges — let your speed rise and fall with the terrain while your effort stays flat.

The 662m of hidden descent is where riders lose the plot: they surge on the dips and blow up on the next ramp. Ride the descents easy, ride the climbs at threshold. If you do not know your ceiling, run the FTP estimator before you commit to a number for the day.

Gearing

With sustained pitches steeper than the 9.1% average and ramps that spike higher still, gearing is not optional — it is what keeps you turning the pedals when the road kicks up. Fit a compact or sub-compact chainset paired with a wide-range cassette; a 34×32 is the minimum, and a 34×34 gives you the margin to spin the steepest sections rather than grind them. Check your actual setup before the ride, not at the base of the climb. A 14.4km HC ascent will expose an under-geared bike within the first few kilometres.

Summary

• Length: 14.4 km
• Average gradient: 9.1%
• Net elevation gain: 1,306 m
• Total ascent: 1,968 m
• Category: HC

Collado Eriste rewards riders who respect the gap between its net gain and its total ascent. Pace to your power, gear for the steepest ramp, and let the undulations work for you instead of against you.