Coll de la Plaça d'Armes

Overview

Coll de la Plaça d'Armes is a Category 1 climb in Spain, running 8.4 km from near sea level to its summit. It starts at 21 m and tops out at 665 m, for a net elevation gain of 644 m. On paper it reads as a steady mid-length ascent, and the 7.62% average gradient confirms it belongs in the serious end of a day's riding.

But the number that reshapes the effort is total ascent: 899 m over that same 8.4 km, against just 644 m of net gain. That 255 m difference is climbing you do twice — earned, given back on descents or false flats, then earned again. This is not a monotone drag to the top. Expect gradient that pitches up, releases, and pitches up again, which taxes your legs more than the net figure suggests and makes rhythm harder to hold.

How the Gradient Unfolds

The 7.62% average is a blend, not a constant. With 255 m of extra ascent hidden inside the profile, the steep sections have to be considerably steeper than 7.62% to offset the flatter and downhill stretches that dilute the mean. The headline hazard is the maximum: a 27.83% ramp that will empty your legs if you hit it in the wrong gear or the wrong moment.

Across the climb, expect:

• Flatter or recovery sections that pull the average down and let you reset
• Repeated short climbs stacked back to back, driving that 899 m of total ascent
• A brutal steepest ramp touching 27.83% — treat it as the single hardest moment on the road

Pacing Notes

On a smooth climb you can pace by even speed. Here, the undulation makes that a trap: chasing a constant speed on the steep pitches spikes your power far past threshold, and you pay for it later. Pace by even effort instead. Anchor your climb to a target sustainable power output and let speed rise and fall with the gradient — faster on the flatter sections, slower on the ramps, without your effort ever redlining.

If you do not know your ceiling, run the numbers through the FTP estimator first. On this profile, holding 5–10% below threshold through the steep pitches leaves the headroom you need to survive the 27.83% ramp without blowing up.

Gearing

The steepest gradient governs your gearing choice, and 27.83% is decisive. This is sub-compact territory. Run a compact 34-tooth or smaller inner chainring paired with a wide-range cassette — a 34×32 or, better, a 34×34 — so you can keep the pedals turning on the worst ramp without grinding to a stall. Check your setup before the ride, not at the base of the climb. If your smallest gear cannot spin the steepest pitch at a cadence you can sustain, fit a wider cassette in advance.

Summary

• Length: 8.4 km
• Average gradient: 7.62%
• Maximum gradient: 27.83%
• Net elevation gain: 644 m
• Total ascent: 899 m
• Category: 1

Coll de la Plaça d'Armes rewards riders who respect its undulation. Pace by effort, gear for the 27.83% ramp, and let the 255 m of hidden climbing shape your plan rather than surprise you.