Colada del Tejo

Overview

Colada del Tejo is an HC-category climb in Spain, running 10.6 km from a start elevation of 318 m to a summit at 1,529 m. Over that distance it delivers 1,211 m of net elevation gain, putting it firmly in the hardest tier of categorised climbs. It is long enough and steep enough that no rider should treat it as a warm-up effort; the numbers alone place it among the serious tests of the region.

The gap between net gain and total ascent tells the real story. The route gains 1,211 m net but climbs 1,632 m in total, meaning roughly 421 m of that ascent is spent re-climbing ground you have already given back. That undulation adds fatigue that a simple net-gain figure hides. You will pedal harder and longer than 1,211 m suggests, and the descents between pitches offer little true recovery because you pay for every one of them again.

How the Gradient Unfolds

The 11.46% average is a blunt figure. On an undulating profile like this, the average is dragged down by dips and flatter shoulders, which means the climbing sections themselves are steeper than 11.46% to compensate. Do not pace off the average; pace off the ramps.

• Flatter or descending sections that briefly drop the effort, then hand the height straight back
• Repeated short climbs stacked through the middle, each one resetting your legs
• Steep ramps well above the average, where the real cost of the climb is concentrated

Pacing Notes

On a smooth, even climb you can ride an even effort and let speed vary. Here the undulation forces a choice. Chasing even speed over the rollers will spike your power on every ramp and cook you before the summit. Instead, anchor to your sustainable power output and hold effort steady, accepting that speed will swing wildly between the dips and the steep pitches.

Let the descents be genuine soft-pedalling recovery rather than places to push. If you do not know your ceiling, run the FTP estimator before you commit to a number for the day.

Gearing

The sustained steepness demands gearing built for the ramps, not the average. Fit a compact or sub-compact chainset paired with a wide-range cassette — a 34×32 or 34×34 gives you a bailout for the steepest pitches without over-torquing your knees at low cadence. On a climb this long, spinning a small gear beats grinding a big one.

Check your setup before the ride. Confirm the cassette and chainset are what you think, that the rear derailleur handles the largest sprocket, and that the chain length is correct. Discovering you are under-geared halfway up an HC climb is a long walk.

Summary

• Length: 10.6 km
• Average gradient: 11.46%
• Net elevation gain: 1,211 m
• Total ascent: 1,632 m
• Category: HC

Colada del Tejo rewards riders who respect the undulation, gear conservatively, and pace by effort rather than speed. Treat the 421 m of repeated climbing as the hidden tax it is, and you will reach 1,529 m with something left.