Col de Tcha Yin Tchai

Col de Tcha Yin Tchai cycling climb profile

Col de Tcha Yin Tchai is a long category 1 climb in Vietnam, and the headline number can undersell the effort. At 18.6 km with an average gradient of 4.65%, it looks controlled on paper, but the maximum gradient of 12.59% changes how it should be ridden. This is not a climb to pace purely by the average.

The road starts at 368 m and tops out at 1232 m, gaining 864 m net from bottom to summit. The total ascent is 892 m, which tells you the climb is not just a clean, steady ramp. There is enough variation in the profile for the legs to be asked different questions along the way, even if the overall gradient remains moderate.

How the gradient unfolds

The defining feature is the gap between the 4.65% average and the 12.59% maximum. That spread usually means the climb gives you recoverable sections, but takes payment back in sharper ramps. The danger is psychological as much as physical: the early slopes may feel manageable, then the steeper pitches force you above your sustainable rhythm if you arrive already riding too close to threshold.

Because the ascent lasts 18.6 km, the climb rewards patience more than aggression. The correct pacing model is to treat the easier gradients as places to stabilize breathing and cadence, not as invitations to lift the pace. If you are riding by power, anchor the effort around sustainable climbing power rather than reacting to every change in slope. For most riders, that means keeping the bulk of the climb below a hard FTP effort and accepting that the steepest sections will briefly push higher.

Pacing and gearing notes

The key is to preserve torque capacity for the 12.59% ramps. If you gear the climb for its 4.65% average, you may be forced into low-cadence grinding when the road steepens. A lower climbing gear is the smarter choice, especially if the aim is to ride the full 18.6 km efficiently rather than simply survive the steepest moments.

Practical approach:

• Start conservatively from 368 m, even if the first gradients feel comfortable.
• Use the moderate sections to settle cadence and keep the effort aerobic.
• Avoid surging over every steeper pitch, because the climb is long enough for those accelerations to compound.
• Shift early before the hardest ramps so cadence does not collapse.
• Save a small reserve for the upper part, where fatigue makes the same gradient feel heavier.

What this climb rewards

Col de Tcha Yin Tchai is a rhythm climb with interruptions. The average gradient suggests tempo, but the maximum gradient demands gearing discipline and restraint. Riders who pace by feel alone may over-invest on the steeper ramps and never fully recover. Riders who manage effort through the full 892 m of total ascent will find it much more controllable.

The best strategy is simple: respect the length, gear for the steepest gradients, and let the easier slopes bring the effort back down instead of using them to chase speed.