Paso de San Juan cycling climb profile
Paso de San Juan is a category 3 climb in MX that rewards control more than aggression. At 6.6 km with an average gradient of 4.35%, it sits in the awkward middle ground where the road is rarely steep enough to force an easy pacing decision, but long enough that repeated small surges can still cost you by the summit.
The climb starts at 958 m and tops out at 1246 m, with the supplied data listing 288 m of net elevation gain. That tells you the basic character: this is a sustained rise rather than a short punch. The listed maximum gradient is 6.98%, so the hard sections are meaningful, but they are not the kind of extreme ramps that completely reset your cadence or demand a survival gear.
How the gradient unfolds
The available profile does not give detailed segment-by-segment changes, so the honest read is based on the overall numbers. A 4.35% average paired with a 6.98% maximum suggests a climb with a relatively controlled gradient ceiling. The decisive feature is not one brutal wall, but the need to keep pressure on the pedals for the full 6.6 km without drifting into a pace you cannot hold.
That matters tactically. On a climb like this, the road can feel deceptively manageable early because the average grade is moderate. The mistake is treating every slightly steeper section like an invitation to accelerate. Since the maximum remains under 7%, those rises should be absorbed smoothly rather than attacked unless you are deliberately making a move.
Pacing and gearing notes
For pacing, ride Paso de San Juan as a steady aerobic climb with a controlled lift over the steeper moments. If you are using power, anchor the effort around what you can actually sustain rather than chasing speed changes caused by gradient. Riders using /glossary/ftp should be especially careful not to let the moderate average tempt them into riding above target too early.
Gearing should prioritize cadence flexibility. Most riders will not need an extreme climbing setup for a listed maximum of 6.98%, but a low enough gear to stay seated and smooth on the steeper pitches is still useful. Over-gearing is the quiet risk here: the climb is not steep enough to scare you immediately, but grinding through the harder sections can turn a manageable category 3 ascent into a slow fade.
The best approach is simple: settle in early, keep the pressure even, and save any real acceleration for the final part of the climb rather than spending it on every rise along the way.