Alto del Naranjo

Overview

Alto del Naranjo is a short climb only on paper. Across 4.3 km it averages a savage 12.4%, dragging you from 1217 m to a 1749 m summit for 532 m of net elevation gain. That average alone would flatten most riders, but the number that defines this climb is the 30.41% maximum gradient — a pitch steep enough to unweight your front wheel and turn pedalling into a survival act. The total recorded ascent of 483 m confirms there is almost no let-up: this is a Category 1 effort compressed into a wall you can nearly see the top of, which is precisely what makes it so punishing.

How the Gradient Unfolds

With a 12.4% average and a 30.41% peak, the arithmetic tells the story: for the climb to hold that mean while spiking above 30%, the "easy" sections are still brutally hard. There is no valley of recovery here. The gap between the 483 m of total ascent and the 532 m net gain is small, meaning the road climbs relentlessly upward with virtually no descending or flat to break the rhythm. Expect the gradient to sit in the low teens for long stretches, then rear up into the twenties and beyond on the sharpest ramps. Every one of the 4.3 km is climbing, and the steepest sections cluster where your legs are already deep in the red.

Pacing Notes

On a climb this steep, pacing is less about even splits and more about damage control. Anchor your effort to your FTP: on the 12.4% average you will likely ride above threshold whether you like it or not, so the goal is to avoid burying yourself before the 30.41% ramps arrive. If you do not know your threshold number, run it through the FTP estimator first, then treat every steep pitch as a short over-threshold surge you must recover from immediately afterward. Start conservatively in the opening kilometre — the summit at 1749 m is only 532 m of climbing away, but on grades like these it will feel far longer. Ride the steepest ramps seated where you can for traction, and stand only to keep momentum when cadence collapses.

Gearing

Do not under-gear this one. A compact 34-tooth chainring is the minimum sensible front, and on the back you want the biggest cassette you can fit. A 34×32 is the floor for strong climbers, but on a 30.41% ramp even fit riders will wish for more — a 34×34 gives you a genuine 1:1 ratio and meaningfully lower torque per pedal stroke, which is the difference between spinning and stalling. If your bike accepts a 34×34 or lower, fit it. Traction and cadence matter more than pride when the road tilts past 30%.

Summary

Alto del Naranjo packs a full mountain's worth of suffering into 4.3 km. A 12.4% average, a 30.41% maximum, and 532 m of net gain to a 1749 m summit make it a Category 1 climb that rewards low gearing and disciplined pacing far more than raw power.

Length: 4.3 km
Average gradient: 12.4%
Max gradient: 30.41%
Start: 1217 m
Summit: 1749 m
Net gain: 532 m
Total ascent: 483 m
Category: 1