Llauro bypass

Overview

The Llauro bypass is a Category 4 climb in France covering 9.1 km. It starts at 87 m and finishes at a summit elevation of 382 m, for a net elevation gain of 295 m. On paper that is a short, modest climb: the numbers point to a steady drag rather than a wall, and the category confirms it sits at the gentler end of the rated scale.

The revealing number is the total ascent of 453 m against a net gain of only 295 m. That 158 m gap is climbing you do twice, because the road undulates: it kicks up, drops, and climbs again rather than gaining height in one clean line. For pacing and fatigue, treat this as a 453 m day, not a 295 m one. The extra vertical is spent on repeated re-accelerations, and it costs more than the tidy net figure suggests.

How the Gradient Unfolds

The 3.23% average is a blend, not a constant. With 158 m of undulation baked in, long stretches sit below that average while the climbing sections run steeper to compensate. The steepest ramp reaches 9.47%, roughly triple the average, so the effort is concentrated rather than evenly spread.

Expect the profile to break down like this:

• Flatter and downhill recovery sections where the road gives back some of the height you gained.
• Repeated short climbs that punch above the 3.23% average as the road claws elevation back.
• One steepest ramp near 9.47% — the pitch that forces the biggest gear change and the sharpest spike in effort.

Pacing Notes

On a climb this undulating, even-effort beats even-speed. Chasing a fixed speed means overcooking the steep pitches and freewheeling the descents, which wastes matches on a profile that already makes you re-climb 158 m. Instead, anchor to your sustainable power output: hold a steady effort on the ramps, accept that your speed will fluctuate, and use the recovery sections to actually recover rather than hammer.

If you do not know your ceiling, run the numbers through the FTP estimator first. Ride the climbing portions just under threshold, spin lightly on the flatter and downhill sections, and you will reach the 382 m summit with reserves intact.

Gearing

The steepest gradient governs your gearing choice, and 9.47% on tired legs is enough to justify going low. A compact (34-tooth inner) or sub-compact chainset paired with a wide-range cassette — 34×32 or 34×34 — gives you a bailout gear for that ramp while keeping cadence high on the repeated short climbs. Check your setup before the ride: confirm the cassette and derailleur actually deliver the low gear you expect, rather than discovering the limit mid-pitch.

Summary

• Length: 9.1 km
• Average gradient: 3.23%
• Maximum gradient: 9.47%
• Net elevation gain: 295 m
• Total ascent: 453 m
• Category: 4

The Llauro bypass rewards riders who read past the 3.23% average. Pace to effort, gear for the 9.47% ramp, and budget for the full 453 m of climbing — not the 295 m net — and this Category 4 will feel measured rather than misjudged.