Portillo de Lazar

Overview

Portillo de Lazar is a Category 4 climb in Spain, running 7.5 km from a start elevation of 839 m to a summit of 1,101 m. The net elevation gain is 262 m, and the average gradient works out to a gentle-looking 3.47%. On paper, those numbers read like a steady warm-up rather than a summit test.

The paper lies a little. Total ascent over the climb is 465 m, well above the 262 m of net gain. That 203 m gap is climbing you do and then give back — the road rises and falls repeatedly rather than tilting up in one clean line. Undulation like this taxes the legs more than the net figure suggests, because every dip means you re-accelerate and re-climb instead of holding one rhythm.

How the Gradient Unfolds

A 3.47% average is a blend of near-flat drags, short descents, and pitches far steeper than the mean. Because roughly 203 m of the ascent is offset by descending, the climbing that remains is concentrated into sharper ramps than the average implies. Expect the effort to arrive in bursts rather than as a constant grind.

• Flatter and recovery sections where the road eases or drops, letting you spin and reset
• Repeated short climbs stacked back to back, each demanding a fresh surge of power
• The steepest ramp, well into double digits, where the grade briefly bites hard before relenting

Pacing Notes

On a smooth, uniform climb you can hold even effort and let speed float. Here, with this much undulation, even-speed pacing is a trap — chasing a constant number over the rollers spikes your power on every rise and torches your legs. Anchor instead to even effort just below your sustainable power output, easing on the flatter drags and accepting that speed will swing. Let the descents be genuine recovery rather than places to hammer. If you do not know your ceiling, run the numbers through the FTP estimator before you go, so your target on the ramps is honest.

Gearing

The steepest ramp is what dictates your setup, not the friendly 3.47% average. That short pitch will force your cadence down if you are geared for the mean, so bring range you will not regret. A compact or sub-compact chainset paired with a wide-range cassette — 34×32 or 34×34 — keeps a spinnable gear in reserve for the sharp bit. Check your chainset and cassette before the ride; discovering you are over-geared halfway up a double-digit ramp is not the time to find out.

Summary

• Length: 7.5 km
• Average gradient: 3.47%
• Maximum gradient: 15.58%
• Net elevation gain: 262 m
• Total ascent: 465 m
• Category: 4

Portillo de Lazar is a modest climb on paper that rides tougher than its average, thanks to 465 m of total ascent against just 262 m of net gain. Pace to effort, gear for the steepest ramp, and treat the rollers with respect.