Colla Bassa cycling climb profile
Colla Bassa is a long, Category 1 cycling climb in Italy that asks for patience more than violence. On paper, 22 km at an average gradient of 4.61% looks manageable, but that average hides the real demand: the climb gains 1015 m from a start elevation of 586 m to a summit elevation of 1601 m, while the total ascent is 1185 m. That extra 170 m of climbing beyond the net gain matters. It tells you this is not a clean, metronomic ramp from bottom to top.
The practical implication is simple: Colla Bassa is likely to ride unevenly. The average is moderate, but the maximum gradient reaches 13.39%, so the steeper sections are not cosmetic. Any time a 22 km climb averages 4.61% while still touching that kind of maximum, the harder ramps have to be balanced by easier ground elsewhere. That creates the pacing trap.
How the gradient unfolds
The broad shape is accumulation. From 586 m to 1601 m, the climb keeps asking for work over a long duration rather than relying only on sustained steepness. The 4.61% average gives you room to settle into tempo, but the 13.39% maximum means you cannot gear or pace it like a steady shallow ascent.
The difference between net elevation gain and total ascent is also important. With 1185 m of total ascent against 1015 m of net gain, the profile includes enough variation to interrupt rhythm. For the rider, that usually means changes in torque demand: easier gradients where speed comes back, followed by ramps that force a decision. Push every rise too hard and the final third of a 22 km climb becomes damage control.
Pacing and gearing notes
Treat Colla Bassa as an aerobic climb with anaerobic interruptions. The correct strategy is to ride the average, not the maximum. Settle below your hard limit early, especially if using /glossary/ftp as a pacing anchor, and save the bigger efforts for the steepest gradients rather than spending them on every change in pitch.
Gearing should be chosen for the 13.39% maximum, not the 4.61% average. A setup that feels comfortable on the easier sections can become restrictive when the road tilts into double digits. If you are forced into a low-cadence grind too early, the climb’s length will compound that muscular fatigue.
For racing or hard group efforts, the decisive moments are likely to come where the gradient sharpens after easier terrain. Those transitions reward riders who have kept something in reserve. The strongest ride here is not the one that starts fastest. It is the one that keeps the steep ramps controlled, uses the easier ground to restore rhythm, and still has pressure left near 1601 m.