Col de Tchu Chang

Col de Tchu Chang cycling climb overview

The Col de Tchu Chang cycling climb is a category 1 ascent in VN, and the defining feature is not a savage average gradient. It is the length. At 47.1 km, rising from 200 m to 1960 m, this is a climb that asks for sustained aerobic control rather than short-term force.

The average gradient of 3.74% can look manageable on paper, but that number needs to be read against the scale of the ascent. The road gains 1760 m net, with 1835 m of total ascent, so the physical cost comes from accumulation. Even when the gradient is not severe, the climb keeps taking energy out of the legs for a long time.

How the gradient unfolds

With only the full-climb statistics available, the honest read is to avoid inventing named ramps or false-flat sections. What the profile does tell us is clear enough: this is a long upward drag with a modest average and enough sharper terrain to punish poor pacing.

The 3.74% average suggests much of the climb should feel rideable at tempo if approached correctly. But the maximum gradient of 8.23% changes how it should be ridden. Those steeper moments are not likely to define the climb by themselves, but they can become expensive if you arrive already over threshold. On a climb this long, every hard surge has a follow-on cost.

The gap between net elevation gain and total ascent also points to a route that is broadly uphill without being perfectly linear. That matters tactically: small variations in gradient can tempt riders into lifting the pace when the road eases, then paying for it when it steepens again.

Pacing and gearing notes

Treat Col de Tchu Chang as an endurance climb first. The best approach is to settle early, keep pressure on the pedals without chasing speed, and let the vertical gain come steadily. If you pace from feel, the opening should feel almost too controlled. If you pace from power, anchor the effort around sustainable climbing output rather than reacting to every change in gradient. For riders using /glossary/ftp, this is the type of climb where discipline below threshold early is more valuable than proving form too soon.

Gearing should prioritize cadence preservation. The maximum gradient of 8.23% is not extreme in isolation, but after a long approach it can feel much harder. A low enough gear to stay seated through the steeper pitches will save the legs and reduce the need for torque-heavy accelerations.

The practical rule is simple: do not let the average gradient make the climb seem easy. Col de Tchu Chang is long, cumulative, and best ridden with patience from the first kilometre to the summit.