Kelok Sembilan is a climb of 5.2 kilometers (hors catégorie). Kelok Sembilan tops out at 833 m above sea level. It is located in Sarilamak, Sumatera Barat, Indonesia. The average gradient is 10.3% with a maximum of 10.1%. The climb has 537 meters of elevation gain.
Difficulty analysis: This climb averages a brutal 10% over 5.2 km, but what makes it hard is the uneven profile. The 8% sections (KM 1.5-2.0, 2.5-3.0, 3.5-4.0) and especially the 12% kilometer (KM 4.0-4.5) are very demanding. The final 225m at 34% is exceptionally steep and is the critical point of the climb.
Pacing tips:
1. Find your rhythm from the start: The first kilometers (0-3% up to KM 1.5) are easy. Use them to settle into a good tempo without wasting energy.
2. Anticipate the hard sections: Ease off slightly before the 8% and 12% stretches to hold a steady power output and avoid blowing up.
3. Save something for the finish: The 500m descent at -1% (KM 4.5-5.0) is crucial for recovering before the final wall at 34%, which will demand a maximum effort and careful gear selection.
5.2 km • 537 m D+
VAM: average climbing speed, based on elevation gain
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