Col de Tchu Qua cycling climb profile
Col de Tchu Qua is a long category 1 climb in VN that asks for patience more than aggression. On paper, 33.6 km at 4.05% looks controlled, but that average is the least useful number if it tempts you into treating the climb as steady and forgiving from bottom to top.
The road starts at 370 m and finishes at 1,730 m, with 1,360 m of net elevation gain. The more telling figure is total ascent: 1,523 m. That gap between net gain and total ascent points to a profile that is not simply one clean ramp to the summit. There is extra climbing embedded inside the route, which usually means changes in pitch, flatter interruptions, or terrain that forces you to re-accelerate rather than settle into one unbroken rhythm.
How the gradient rides
The full-climb average of 4.05% suggests a climb where much of the work can be done seated and aerobic. This is not defined by one savage wall, but by duration and accumulation. The danger is letting the easier-feeling gradients early in the climb pull you above sustainable effort, because the climb is long enough for small pacing errors to compound.
The maximum gradient of 11.32% changes the character. Even if the steepest ramps are brief, they are steep enough to force a gear change and push torque up sharply. That means the climb rewards riders who keep something in reserve for the steeper pitches rather than riding the 4.05% average as if it describes every kilometre.
Pacing and gearing notes
Treat Col de Tchu Qua as an endurance climb with intermittent pressure points. The right approach is to ride the easier gradients slightly under control, then absorb the steeper sections without spiking too far above threshold. If you pace by /glossary/ftp, the mistake is trying to hold a constant power number through every ramp. A better target is a controlled average effort, allowing short increases when the road demands it but avoiding repeated surges that turn the final third into damage control.
Gearing should be chosen for the 11.32% maximum, not the 4.05% average. A low climbing gear matters because the steepest sections will arrive after meaningful fatigue has already built up. If you are grinding early, you are spending matches too soon.
The practical read is simple: Col de Tchu Qua is not brutally steep on average, but it is long, accumulative, and uneven enough to punish impatience. Keep the cadence comfortable, let the moderate gradients feel almost too easy, and save the harder effort for the ramps and the final push to 1,730 m.