Alto de San Pablo cycling climb profile
Alto de San Pablo is a long Category 1 climb in CO: 25.6 km at an average gradient of 5.16%, rising from 766 m to 2089 m. The net elevation gain is 1323 m, while the total ascent is 1442 m, which is the key detail for how it will feel on the bike.
This is not a short, explosive wall. It is a sustained aerobic climb where the main difficulty comes from duration, accumulated elevation gain, and the need to stay disciplined before the steeper sections arrive.
Gradient and rhythm
The average gradient of 5.16% suggests a climb that can be ridden with rhythm when the road is steady. But the maximum gradient of 12.22% changes the pacing equation. A climb with that spread between average and maximum is unlikely to feel completely uniform. The profile data points to a long ascent with easier or more controlled sections mixed with sharper pitches that can force you out of your preferred cadence.
The difference between net elevation gain and total ascent also matters. Alto de San Pablo gains 1323 m from start to summit, but includes 1442 m of total ascent. That means the road does not behave like a perfectly clean ramp. Even if the average looks manageable on paper, the extra climbing load makes it more expensive than a simple start-to-summit calculation suggests.
How to pace it
The mistake here is treating 5.16% as permission to ride aggressively from the bottom. Over 25.6 km, small excesses compound. The smarter approach is to settle below your sustainable climbing limit early, especially if riding by /glossary/ftp or perceived exertion.
Use the steadier sections to lock into rhythm rather than to chase speed. When the road kicks toward the 12.22% maximum, resist the urge to surge unless the effort has a clear purpose. Those steeper ramps are where riders who have been slightly over threshold begin paying interest.
A good pacing model is controlled pressure on the lower and middle portions, then a gradual lift only once you are confident the remaining distance is manageable. The summit elevation of 2089 m is not just a finish line statistic - it represents a long vertical workload from a 766 m start.
Gearing notes
Bring gearing that lets you stay seated and keep torque under control on double-digit gradients. The climb may average 5.16%, but the 12.22% maximum means a gear that feels fine on the lower slopes can become too heavy when fatigue is already in the legs.
Prioritize a low climbing gear over top-end speed. If you are forced into grinding early, the final part of the climb will become disproportionately costly. A cadence-focused setup is the safer choice for a climb with this length and total ascent.