Col de Bentarte

Overview

Col de Bentarte is a Category 2 climb in Spain, running 13.8 km from a start elevation of 729 m to a summit at 1295 m. On paper that produces a net elevation gain of 566 m at an average gradient of 4.09% — numbers that suggest a steady, manageable ascent well inside most riders' comfort zone.

The reality is harder than the net figure implies. While you only gain 566 m between the base and the top, the total ascent over the full 13.8 km is 1103 m. That gap of 537 m is elevation you climb, give back, and have to climb again. This undulation means the road repeatedly rises and falls rather than tilting up in one clean line, so the muscular and metabolic cost is roughly double what the net gain alone would predict. Treat this as a 1103 m day, not a 566 m one.

How the Gradient Unfolds

The 4.09% average is misleading because it is diluted by descents and flat sections that reset the elevation clock. Averaging across drops flattens the number, while the climbing that actually happens on the ramps is far steeper. The standout figure is the maximum gradient of 20.73% — a wall that will force you out of the saddle regardless of how you feel.

• Flatter and downhill recovery sections that give back elevation and drag the average down
• Repeated short climbs stacked back to back, each demanding a fresh surge of effort
• A steepest ramp reaching 20.73%, well beyond anything the average prepares you for

Pacing Notes

On an undulating climb like this, chasing an even speed is a trap: holding pace on the 20.73% ramp would spike your power far past threshold. Pace to an even effort instead. Anchor your climbing sections to your sustainable power output, let speed rise on the flatter recovery stretches, and accept slower speeds on the steep pitches to keep power in check. If you do not know your ceiling, run the FTP estimator before you go so your effort target is grounded in real numbers rather than feel.

Gearing

The 20.73% maximum dictates your setup. A compact or sub-compact chainset paired with a wide-range cassette — something like 34×32 or 34×34 — gives you a low enough ratio to spin the steepest ramp rather than grind it and blow up. Check your chainrings and cassette before the ride; discovering you are under-geared on a 20% wall is a mistake you only make once.

Summary

• Length: 13.8 km
• Average gradient: 4.09%
• Maximum gradient: 20.73%
• Net elevation gain: 566 m
• Total ascent: 1103 m
• Category: 2

The category and average understate the demand here. Respect the 1103 m of total ascent, pace to effort through the undulation, and bring gearing built for the 20.73% ramp — do that and Col de Bentarte rewards a smart ride.