Alto de Sucubún cycling climb profile
Alto de Sucubún is a long category 2 climb in Colombia, and its headline numbers tell you almost everything about how it should be ridden. At 29.8 km, with 1078 m of net elevation gain from 1873 m to 2951 m, this is not a short effort to muscle through. The average gradient of 3.62% suggests a climb that rewards steadiness, but the 10.5% maximum gradient is the important warning label: the easy-looking average can hide sharper ramps that punish riders who treat the early kilometres too casually.
How the gradient shapes the effort
The climb gains height gradually across a long distance. That low average gradient means much of the ascent is likely spent on manageable slopes where aerodynamic drag and rhythm still matter, rather than on continuous low-speed climbing. But the total ascent of 1176 m is higher than the net gain of 1078 m, which points to some variation in the road rather than a perfectly even ramp from bottom to summit.
That matters tactically. On a steady climb, pacing is mostly about holding a constant power. On Alto de Sucubún, the better approach is controlled flexibility: stay under control on the easier gradients, avoid surging hard over the steepest sections, and use any softer sections to settle breathing rather than to accelerate.
Pacing strategy
The main mistake is judging the climb by the 3.62% average and riding it like a tempo drag from the start. Over 29.8 km, small over-threshold efforts accumulate quickly, especially once the road reaches the steeper pitches near the 10.5% maximum. A smart pacing plan is to keep the first part conservative, ride the middle by feel or power, and only start lifting the effort once the remaining distance is short enough that a fade will not cost more than the acceleration gains.
If riding with power, anchor the climb around sustainable climbing intensity rather than chasing speed changes. If you are unsure of your current threshold, use a recent test or estimate from /tools/ftp-estimator before setting targets around /glossary/ftp.
Gearing notes
Because the average gradient is moderate but the maximum gradient reaches 10.5%, gearing needs to cover both scenarios. A setup that feels efficient on shallow gradients but leaves no bailout gear for the steep ramps is a poor match for this climb. The goal is not just to survive the steepest sections, but to ride them without spiking torque so badly that the final kilometres become damage control.
Choose gearing that lets you keep cadence smooth when the road tips up, then stay disciplined on the easier gradients. Alto de Sucubún is less about one decisive wall and more about managing a long accumulation of elevation. The rider who paces the full 29.8 km, not just the average gradient, gets the best return.