Alto de la Alianza

Alto de la Alianza cycling climb profile

Alto de la Alianza is a compact but demanding Category 1 climb in Chile: 9.6 km long, 875 m of net elevation gain, and an average gradient of 9.09%. That combination tells you most of what matters before you even look at the road. This is not a climb that gives much room to hide. If the average is already above 9%, any section that feels easier is likely paid back by something significantly steeper later.

The defining feature is density. Over less than 10 km, the road rises from 3,461 m to 4,336 m, so the vertical gain comes quickly and at elevation. That makes pacing more important than ego. A rider who treats the opening as a normal threshold effort can find the upper slopes much harder to control, not because the climb suddenly becomes long, but because the sustained gradient and altitude leave little margin for recovery.

How the gradient unfolds

With an average of 9.09% and a maximum gradient of 16.41%, Alto de la Alianza should be ridden as a steep, sustained climb with sharper ramps layered into the effort. The profile is unlikely to reward repeated accelerations. The better approach is to assume the climb sits close to your sustainable climbing ceiling, then keep enough in reserve for the steepest pitches.

The 16.41% maximum matters tactically. Even if that ramp is short, it changes the way the whole climb should be managed. On a climb averaging above 9%, a ramp into the mid-teens is not just a brief spike. It can force cadence down, push torque up, and drag riders above /glossary/ftp if they are already riding too close to the limit.

Pacing and gearing notes

Start controlled. The first goal is not to feel strong, but to avoid creating an oxygen and lactate debt that becomes expensive higher up. A sensible pacing target is steady pressure, seated as much as possible, with effort capped below the point where breathing becomes ragged too early.

Gearing should be conservative. Bring a low enough climbing gear to keep cadence from collapsing on the 16.41% maximum gradient. If you need to stand, use it to smooth torque rather than to attack the climb. The road is steep enough that overgearing will turn the upper section into a strength test instead of a controlled aerobic effort.

For data-driven riders, this is a climb to pace from power and sensation together. Power can keep the early kilometers honest, but at 4,336 m near the summit, perceived exertion will often rise for the same output. The winning strategy is simple: ride the 9.6 km as one sustained effort, respect the gradient from the bottom, and save the aggression for the final portion rather than spending it on the first steep ramp.