Puerto de Chía

Overview

Puerto de Chía is a category 2 climb in Spain, running 8.7 km from a start elevation of 1,116 m to a summit of 1,671 m. Over that distance it delivers a net elevation gain of 555 m at an average gradient of 6.41%. On paper that average reads as a solid, sustained tempo climb — steep enough to demand respect, consistent enough to settle into a rhythm.

The number that changes the story is total ascent. While the net gain is 555 m, the total ascent is 726 m — a difference of 171 m of climbing that never shows up in the point-to-point figure. That gap means the road undulates: you give back altitude on descents and false flats, then re-climb it. In practice you do more vertical work than the net figure suggests, and the recovery sections come with a cost, because every metre lost has to be earned again.

How the Gradient Unfolds

The 6.41% average is a blend, not a constant. With 171 m of hidden re-climbing, the profile pitches up and eases off repeatedly rather than holding one steady wall. The steepest ramp hits 21.22% — roughly three times the average — so there are pinch points that will spike your effort well beyond tempo.

• Flatter and downhill sections that let you recover, but which also erase altitude you must regain
• Repeated short climbs stacked between the easier stretches, driving total ascent above net gain
• At least one severe ramp topping out at 21.22%, far steeper than the average implies

Pacing Notes

On a climb this lumpy, chasing an even speed is a trap — it forces you deep into the red on every steep pitch and lets you coast on the flats. Pace to an even effort instead, holding a steady sustainable power output through the ramps and accepting that your speed will swing. Let the gradient dictate the pace, not the clock.

Because the steep pitches will push you above threshold, know your ceiling before you start. Use the FTP estimator to anchor your target, then ride the 21.22% ramp as a short, deliberate over-effort rather than a sign to reset your whole climb.

Gearing

The 21.22% maximum ramp governs your gearing choice, not the 6.41% average. At that pitch, a standard chainset will have you grinding at cadences that wreck your legs for the rest of the climb. Run a compact or sub-compact chainset paired with a wide-range cassette — a 34×32 or 34×34 gives you the spin range to keep the pedals turning through the steepest section. Check your setup before the ride; the top of a 21% ramp is the wrong place to discover you are over-geared.

Summary

• Length: 8.7 km
• Average gradient: 6.41%
• Maximum gradient: 21.22%
• Net elevation gain: 555 m
• Total ascent: 726 m
• Category: 2

Puerto de Chía is a category 2 climb that plays tougher than its average suggests. The 171 m gap between net gain and total ascent means you climb more than the summit figure implies, so pace to effort, gear for the 21.22% pinch, and treat the recovery sections as borrowed altitude you will pay back before the top.