Colla di Boasi cycling climb profile
Colla di Boasi is a long, controlled climb rather than a brutally steep one. On paper, the key tension is clear: 17.2 km at an average gradient of 3.65%, with a maximum gradient of 8.85%. That combination matters because it changes how the climb should be ridden. The average tells you this is not a constant high-torque grind, but the maximum gradient tells you there are still sections steep enough to punish poor pacing or overgearing.
The climb starts low, at 39 m, and tops out at 667 m, gaining 628 m in total. Since the listed total ascent is also 628 m, the profile is best understood as a continuous upward ride in elevation terms. There is no hidden extra climbing in the data beyond the net gain, so the difficulty comes less from repeated rises and drops and more from the sustained duration of the ascent.
How the gradient unfolds
With only the headline gradient data, the safest read is that Colla di Boasi spreads its elevation gain over distance. A 3.65% average across 17.2 km means much of the climb must be relatively moderate, but the 8.85% maximum is the warning label. The road is unlikely to feel hard every metre, yet it has enough pitch variation that a rider who treats the early kilometres like false flat can arrive at the steeper ramps already too close to the limit.
That is the defining pacing problem here. The climb invites speed because the average gradient is manageable, but the length keeps accumulating fatigue. The steeper sections are not defined in the provided data, so the practical approach is to assume they can arrive at any point and keep enough margin to respond without spiking deep above your sustainable climbing effort.
Pacing strategy
Ride Colla di Boasi as a category 2 climb that rewards restraint. The first priority is to avoid letting the shallow average gradient pull you into a prolonged effort above tempo. If you use power, anchor the early part below your /glossary/ftp rather than chasing speed. If you ride by feel, you should be able to keep pressure on the pedals without turning the climb into a time trial from the base.
The maximum gradient of 8.85% is steep enough to make surges costly, especially after several kilometres of steady climbing. When the road pitches up, resist the instinct to hold the same speed. Let speed fall, protect cadence, and keep the effort smooth. The riders who climb this well will not be the ones who attack every ramp, but the ones who keep the steepest moments from becoming anaerobic debt.
Gearing notes
Because the average gradient is modest, Colla di Boasi does not demand extreme climbing gearing for every rider. But the near 9% maximum makes a low gear valuable, particularly if you are riding it after fatigue has already accumulated. Choose gearing that lets you stay seated and maintain cadence on the steepest ramps, not just gearing that feels efficient on the easier grades.
The best setup is one that gives you two modes: a comfortable gear for the long, rolling pressure of the 3.65% average, and a bailout option for the 8.85% sections. If cadence collapses on those ramps, the climb becomes more muscular than aerobic, and over 17.2 km that cost compounds quickly.