Coll de les Comes cycling climb profile
Coll de les Comes is a category 1 climb in ES that asks for patience more than aggression. On paper, 23.8 km at 4.19% can look manageable, but that average is only part of the story. The climb rises from 96 m to 1094 m, gaining 998 m net, with 1028 m of total ascent. That tells you two useful things before you turn a pedal: it is long enough to punish early enthusiasm, and it is not just a steady metronomic drag from bottom to top.
The defining number is the maximum gradient of 20.83%. A climb with a 4.19% average and a ramp that steep is inherently uneven. The easier sections pull the average down, while the steepest pitches demand real torque and good gear choice. That contrast is what shapes the ride. If you pace it like a smooth tempo climb, the sharp ramps can push you over the edge before the summit is close enough to justify it.
How the gradient feels
The first principle here is not to be fooled by the average. A 23.8 km climb at 4.19% still accumulates nearly a full vertical kilometre of net elevation gain, so the cost comes through duration as much as steepness. The road gives enough variation that you will need to manage effort rather than lock into one power and ignore what is happening under the wheels.
The total ascent of 1028 m compared with 998 m of net gain suggests a profile with small interruptions rather than a perfectly continuous rise. Those moments can help you reset, but they can also tempt you into riding too hard when the gradient eases. The better approach is to use the gentler ground to recover slightly, fuel, and let the bike run, not to chase speed for its own sake.
The steepest gradients change the physiological demand. At 20.83%, cadence can collapse if you are overgeared, and once cadence drops badly, the climb becomes muscular rather than aerobic. That is the quickest way to turn a long category 1 ascent into a survival ride.
Pacing strategy
Treat Coll de les Comes as an endurance climb with repeated tests, not as a short hill where you can punch over every steep section. Settle below your sustainable climbing limit early, especially if riding by /glossary/ftp. The goal is to arrive at the harder ramps with enough margin to absorb them without repeatedly going deep into the red.
A good rule is simple: pace for the full 23.8 km, gear for the 20.83% maximum. Those are two different decisions, and both matter. The average gradient tells you the climb rewards restraint. The maximum gradient tells you that a bailout gear is not optional if you want to keep the effort controlled.
Gearing and ride notes
Use a climbing setup that lets you keep pedalling smoothly when the road pitches up. There is no value in choosing gearing based only on the 4.19% average, because that number hides the hardest moments. If the bike is overgeared, every steep ramp becomes a forced effort, and those efforts compound across the climb.
For a strong ride, keep the early kilometres controlled, stay seated when possible to save energy, and stand only when the gradient or fatigue makes it useful. Eat and drink before you feel pressured by the road. Coll de les Comes is not defined by one statistic, but by the gap between its moderate average and its severe maximum. Manage that gap well, and the climb becomes a long, disciplined ascent rather than a series of costly corrections.