Alto de Tonlemo

Alto de Tonlemo cycling climb profile

Alto de Tonlemo is a compact but legitimate category 2 climb: 5.6 km at an average gradient of 6.23%, rising from 91 m to 440 m for 349 m of net elevation gain. The key point is not the length alone, but the combination of sustained climbing and a maximum gradient of 13.42%. That makes it the kind of ascent where a rider can lose more time from one bad pacing decision than from a lack of raw fitness.

The average gradient sits in that awkward middle zone. It is steep enough that drafting and momentum matter less than steady power, but not so steep that the climb automatically forces everyone into survival mode from the base. That creates a pacing trap. The lower half can feel manageable if the effort is judged only by sensation, but the arithmetic is clear: over 5.6 km, a 6.23% average means the road is asking for sustained aerobic work almost immediately.

How the gradient unfolds

The available profile gives the headline shape rather than a detailed kilometre-by-kilometre breakdown, so the safest way to read Alto de Tonlemo is as a steady climb with sharper ramps embedded inside it. The summit gain from 91 m to 440 m confirms the climb is continuously meaningful rather than a rolling drag, while the 13.42% maximum gradient changes how it should be ridden.

That maximum matters because it limits the margin for aggressive pacing. A rider who treats the early kilometres like a hard tempo effort may find the steepest section arriving when cadence is already falling. On a climb this short, the instinct is to press early, but the smarter play is to preserve enough torque and breathing room to handle the double-digit ramp without spiking too far above sustainable power.

Pacing and gearing notes

Ride the opening phase under control, especially if using /glossary/ftp as the anchor. The climb is short enough to reward commitment, but long enough that a full-gas start is expensive. A good pacing model is controlled pressure from the base, then a more deliberate lift once the summit effort is clearly within reach.

Gearing should be chosen for the 13.42% maximum, not the 6.23% average. If the easiest gear only feels comfortable on the average gradient, it will feel too large on the steepest pitch. The goal is to stay seated and keep cadence from collapsing when the road bites, because grinding over the ramp will cost more than just a few seconds - it will change the entire final part of the climb.

For stronger riders, Alto de Tonlemo is a place to build the effort progressively and use the steep section as the selection point. For everyone else, the priority is simple: respect the maximum gradient, stay patient through the first part, and avoid turning a category 2 climb into a recovery-limiting effort through one early surge.