Yizikou Naijian is a climb of 14.1 kilometers (hors catégorie). The climb finishes at 2,913 m above sea level. It is located in préfecture autonome yi de Liangshan, 四川省, 中国. The average gradient is 5.4% with a maximum of 15.5%. The climb has 766 meters of elevation gain.
Difficulty breakdown: The climb to 依子口乃坚 from Hongxi covers 14.1 km with 766 m of elevation gain at an average gradient of 5.4%, which earns it the hors catégorie (HC) rating. The real pain is in the second half. From km 0.0 to km 6.0 the gradient stays manageable, between 2% and 3%, but from km 8.0 to km 14.0 it bounces between 6% and 8%, peaking at 8% between km 8.0 and 9.0. That long, sustained section is the real decider of the climb.
Pacing tips:
1. Save your legs from the bottom. In the first six kilometres, where the gradient never tops 3%, ride at a steady tempo. Don't burn matches before the hard part arrives.
2. Prepare for the change between km 6.0 and km 8.0. The gradient climbs from 4% to 5% before hitting 8%. This is the time to shift into an easier gear and settle into your rhythm before tackling the steepest section.
3. Hold a steady rhythm all the way to km 14.0. Between km 8.0 and km 14.0, spin a smooth, consistent cadence, and start eating and drinking from km 8.0, because the effort stays hard right up to the top.
14.1 km • 766 m D+
VAM: average climbing speed, based on elevation gain
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