Collado de Sancho Leza

Overview

Collado de Sancho Leza is a category 3 climb in Spain, running 8.5 km from a start elevation of 1052 m to a summit of 1400 m. On paper it is a modest ascent: 348 m of net elevation gain at a 4.1% average gradient. The numbers place it firmly in the "long tempo" bracket rather than a savage wall, but the average is only half the picture.

The gap between the net gain and the total ascent is where the real work hides. You gain 348 m from bottom to top, but you actually climb 512 m across the ride — meaning roughly 164 m of descending is folded in along the way. Every metre you give back on a downhill is a metre you have to reclaim on the next rise. That undulation makes the effort punchier and less rhythmic than a steady 4.1% grade would suggest, and it taxes riders who cannot repeatedly change gears and re-accelerate.

How the Gradient Unfolds

A 4.1% average on a climb with 512 m of total ascent tells you the road is not uniform. The descents and flats drag the average down, which means the climbing sections are steeper than 4.1% to compensate. Expect the gradient to swing rather than settle.

• Flatter and downhill recovery sections that let the average sit low — use them, don't coast them.
• Repeated short climbs stacked back to back, each one asking for a fresh surge of effort.
• A steepest ramp that spikes well into double digits, far above the average, where you'll want your lowest gear ready.

Pacing Notes

On a smooth, even-gradient climb you can hold a single power number top to bottom. Here, that approach breaks down. Because of the undulation, even-effort pacing beats even-speed pacing: hold a steady sustainable power output through the rises and let your speed rise on the descents rather than chasing a fixed pace. Don't burn matches trying to keep the same km-split across a downhill and a steep pitch — that's how you blow up before the summit. If you don't know your ceiling, run the numbers through the FTP estimator before you set your targets.

Gearing

The steepest ramp is what dictates your setup, not the 4.1% average. For a climb with pitches into the high teens, run a compact or sub-compact chainset paired with a wide-range cassette — a 34×32 or 34×34 gives you the spin room to sit and turn the steep sections rather than grinding out of the saddle. Check your setup before the ride; the worst place to discover you're over-geared is halfway up the sharpest kick.

Summary

• Length: 8.5 km
• Average gradient: 4.1%
• Maximum gradient: 19.33%
• Net elevation gain: 348 m
• Total ascent: 512 m
• Category: 3

Collado de Sancho Leza rewards riders who read the profile rather than the average. Pace by effort, gear for the steepest ramp, and treat the 164 m of hidden descent as recovery, not lost ground.