Paso Lachao is a climb of 19.9 kilometers (hors catégorie). Paso Lachao tops out at 1,949 m above sea level. It is located in San Pedro Juchatengo, Oaxaca, México. The average gradient is 5.3% with a maximum of 10.9%. The climb has 1055 meters of elevation gain.
Difficulty breakdown: At 19.9 km for 1055 m of elevation gain and an average gradient of 5.3%, the Paso Lachao is a beyond category climb that's seriously demanding. The real challenge is its consistency: from km 1 to km 7, the gradient never drops below 5%, with 6% on km 1-2 and km 6-7. The stretches at km 8-10 and km 16-18, at 2%, offer welcome breathers, but the final section is tough, with 6% from km 14-15 and from km 19-19.9.
Pacing tips:
1. Don't blow up at the start. The km 0-1 section at 4% is for settling in, but save some legs for the 5-6% block from km 1 to km 7.
2. Recover on the false flats. Use the 2% stretches (km 8-10 and km 16-18) to top up on carbs and fluids, and pick up the pace slightly.
3. Save something for the finish. The 6% sections at km 14-15 and km 19-19.9 are best handled with an appropriate gear and a steady cadence, without surges.
19.9 km • 1055 m D+
VAM: average climbing speed, based on elevation gain
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